win: unrecommend and document Live ID service #100

Rename service to its newer name. Mention breaking behavior in its name
and add more documentation.

Unrecommended from "Standard" pool because it breaks a lot of
functionality, but still recomended in "Stricts" because it's used to
identify personal information that leads to less privacy.

.editorconfig

@@ -0,0 +1,7 @@
+[*.{js,jsx,ts,tsx,vue}]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 100

.eslintrc.js

@@ -0,0 +1,115 @@
+const { rules: baseStyleRules } = require('eslint-config-airbnb-base/rules/style');
+
+module.exports = {
+  root: true,
+  env: {
+    node: true,
+  },
+  extends: [
+    // Vue specific rules, eslint-plugin-vue
+    // Added by Vue CLI
+    'plugin:vue/essential',
+
+    // Extends eslint-config-airbnb
+    // Added by Vue CLI
+    // Here until https://github.com/vuejs/eslint-config-airbnb/issues/23 is done
+    '@vue/airbnb',
+
+    // Extends @typescript-eslint/recommended
+    // Uses the recommended rules from the @typescript-eslint/eslint-plugin
+    // Added by Vue CLI
+    '@vue/typescript/recommended',
+  ],
+  parserOptions: {
+    ecmaVersion: 'latest',
+  },
+  rules: {
+    ...getOwnRules(),
+    ...getTurnedOffBrokenRules(),
+    ...getOpinionatedRuleOverrides(),
+    ...getTodoRules(),
+  },
+  overrides: [
+    {
+      files: [
+        '**/__tests__/*.{j,t}s?(x)',
+        '**/tests/unit/**/*.spec.{j,t}s?(x)',
+      ],
+      env: {
+        mocha: true,
+      },
+    },
+    {
+      files: ['**/tests/**/*.{j,t}s?(x)'],
+      rules: {
+        'no-console': 'off',
+      },
+    },
+  ],
+};
+
+function getOwnRules() {
+  return {
+    'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
+    'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
+    'linebreak-style': ['error', 'unix'], // This is also enforced in .editorconfig and .gitattributes files
+    'import/order': [ // Enforce strict import order taking account into aliases
+      'error',
+      {
+        groups: [ // Enforce more strict order than AirBnb
+          'builtin', 'external', 'internal', 'parent', 'sibling', 'index', 'object', 'type'],
+        pathGroups: [ // Fix manually configured paths being incorrectly grouped as "external"
+          '@/**', // @/..
+          '@tests/**', // @tests/.. (not matching anything after @** because there can be third parties as well)
+          'js-yaml-loader!@/**', // E.g. js-yaml-loader!@/..
+        ].map((pattern) => ({ pattern, group: 'internal' })),
+      },
+    ],
+  };
+}
+
+function getTodoRules() { // Should be worked on separate future commits
+  return {
+    'import/no-extraneous-dependencies': 'off',
+    // Requires webpack configuration change with import '..yaml' files.
+    'import/no-webpack-loader-syntax': 'off',
+    'import/extensions': 'off',
+    'import/no-unresolved': 'off',
+    // Accessibility improvements:
+    'vuejs-accessibility/form-control-has-label': 'off',
+    'vuejs-accessibility/click-events-have-key-events': 'off',
+    'vuejs-accessibility/anchor-has-content': 'off',
+    'vuejs-accessibility/accessible-emoji': 'off',
+  };
+}
+
+function getTurnedOffBrokenRules() {
+  return {
+    // Broken in TypeScript
+    'no-useless-constructor': 'off', // Cannot interpret TypeScript constructors
+    'no-shadow': 'off', // Fails with TypeScript enums
+  };
+}
+
+function getOpinionatedRuleOverrides() {
+  return {
+    // https://erkinekici.com/articles/linting-trap#no-use-before-define
+    'no-use-before-define': 'off',
+    // https://erkinekici.com/articles/linting-trap#arrow-body-style
+    'arrow-body-style': 'off',
+    // https://erkinekici.com/articles/linting-trap#no-plusplus
+    'no-plusplus': 'off',
+    // https://erkinekici.com/articles/linting-trap#no-param-reassign
+    'no-param-reassign': 'off',
+    // https://erkinekici.com/articles/linting-trap#class-methods-use-this
+    'class-methods-use-this': 'off',
+    // https://erkinekici.com/articles/linting-trap#importprefer-default-export
+    'import/prefer-default-export': 'off',
+    // https://erkinekici.com/articles/linting-trap#disallowing-for-of
+    // Original: https://github.com/airbnb/javascript/blob/d8cb404da74c302506f91e5928f30cc75109e74d/packages/eslint-config-airbnb-base/rules/style.js#L333-L351
+    'no-restricted-syntax': [
+      baseStyleRules['no-restricted-syntax'][0],
+      ...baseStyleRules['no-restricted-syntax'].slice(1).filter((rule) => rule.selector !== 'ForOfStatement'),
+    ],
+  };
+}

.gitattributes

@@ -0,0 +1,6 @@
+# Prevent Git from auto-converting to CRLF on Windows, and convert to LF on checkin.
+#   *           : All files
+#   text=auto   : If Git decides content it text, it converts CRLF to LF on checkin.
+#   eol=lf      : forces Git to normalize line endings to LF on checkin and prevents conversion
+#                 to CRLF when the file is checked out.
+* text=auto eol=lf

.github/workflows/checks.build.yaml

@@ -0,0 +1,59 @@
+name: build-checks
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-web:
+    strategy:
+      matrix:
+        os: [ macos, ubuntu, windows ]
+        mode: [ development, test, production ]
+      fail-fast: false # Allows to see results from other combinations
+    runs-on: ${{ matrix.os }}-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Setup node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 15.x
+      -
+        name: Install dependencies
+        run: npm ci
+      -
+        name: Build
+        run: npm run build -- --mode ${{ matrix.mode }}
+
+  # A new job is used due to environments/modes different from Vue CLI, https://github.com/nklayman/vue-cli-plugin-electron-builder/issues/1626
+  build-desktop:
+    strategy:
+      matrix:
+        os: [ macos, ubuntu, windows ]
+        mode: [ development, production ] # "test" is not supported https://github.com/nklayman/vue-cli-plugin-electron-builder/issues/1627
+      fail-fast: false # Allows to see results from other combinations
+    runs-on: ${{ matrix.os }}-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Setup node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 15.x
+      -
+        name: Install dependencies
+        run: npm ci
+      -
+        name: Install cross-env
+        # Used to set NODE_ENV due to https://github.com/nklayman/vue-cli-plugin-electron-builder/issues/1626
+        run: npm install --global cross-env
+      -
+        name: Build
+        run: |-  
+          cross-env-shell NODE_ENV=${{ matrix.mode }}
+          npm run electron:build -- --publish never --mode ${{ matrix.mode }}

.github/workflows/checks.quality.yaml

@@ -1,4 +1,4 @@
-name: Quality checks
+name: quality-checks
 
 on: [ push, pull_request ]
 
@@ -8,12 +8,13 @@ jobs:
     strategy:
       matrix:
         lint-command:
-          - npm run lint:vue
+          - npm run lint:eslint
           - npm run lint:yaml
           - npm run lint:md
           - npm run lint:md:relative-urls
           - npm run lint:md:consistency
-      fail-fast: false # So it continues with other commands if one fails
+        os: [ macos, ubuntu, windows ]
+      fail-fast: false # Still interested to see results from other combinations
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/checks.security.yaml

@@ -1,4 +1,4 @@
-name: Security checks
+name: security-checks
 
 on:
   push:

.github/workflows/release.desktop.yaml

@@ -1,4 +1,4 @@
-name: Deploy desktop
+name: release-desktop
 
 on:
  release:

.github/workflows/release.git.yaml

@@ -1,4 +1,4 @@
-name: Bump & release
+name: release-git
 
 on:
   push: # Ensure a new release is created for each new tag

.github/workflows/release.site.yaml

@@ -1,4 +1,4 @@
-name: Deploy site
+name: release-site
 
 on:
  release:

.github/workflows/tests.e2e.yaml

@@ -0,0 +1,28 @@
+name: e2e-tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  run-tests:
+    strategy:
+      matrix:
+        os: [macos, ubuntu, windows]
+      fail-fast: false # So it still runs on other OSes if one of them fails
+    runs-on: ${{ matrix.os }}-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Setup node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 15.x
+      -
+        name: Install dependencies
+        run: npm ci
+      -
+        name: Run e2e tests
+        run: npm run test:e2e -- --headless

.github/workflows/tests.integration.yaml

@@ -1,9 +1,9 @@
-name: Test
+name: integration-tests
 
 on:
   push:
   pull_request:
-  schedule: # for integration tests
+  schedule: # To get notified about problems from third party dependencies
     - cron: '0 0 * * 0' # at 00:00 on every Sunday
 
 jobs:
@@ -25,9 +25,6 @@ jobs:
       -
         name: Install dependencies
         run: npm ci
-      -
-        name: Run unit tests
-        run: npm run test:unit
       -
         name: Run integration tests
         run: npm run test:integration

.github/workflows/tests.unit.yaml

@@ -0,0 +1,28 @@
+name: unit-tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  run-tests:
+    strategy:
+      matrix:
+        os: [macos, ubuntu, windows]
+      fail-fast: false # So it still runs on other OSes if one of them fails
+    runs-on: ${{ matrix.os }}-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Setup node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 15.x
+      -
+        name: Install dependencies
+        run: npm ci
+      -
+        name: Run unit tests
+        run: npm run test:unit

.gitignore

@@ -4,3 +4,6 @@ dist/
 .vscode
 #Electron-builder output
 /dist_electron
+# Cypress
+/tests/e2e/screenshots
+/tests/e2e/videos

CHANGELOG.md

@@ -1,5 +1,20 @@
 # Changelog
 
+## 0.11.2 (2021-12-03)
+
+* Fix Windows TrustedInstaller session errors | [20a0071](https://github.com/undergroundwires/privacy.sexy/commit/20a0071c0d3d769a8f31218abdbfc4cafa25c6ff)
+* Improve tests for `UserSelection` | [2f90cac](https://github.com/undergroundwires/privacy.sexy/commit/2f90cac52ab9e57615aeec41f9daa842bce770a5)
+* Fix disabling/enabling Defender on Windows #104 | [2e08293](https://github.com/undergroundwires/privacy.sexy/commit/2e082932c952b0849ab2b8709ff0c75293b88e95)
+* Refactor Saas naming, structure and modules | [bf83c58](https://github.com/undergroundwires/privacy.sexy/commit/bf83c58982ffa178facc6d35e50c7f1eac7ff236)
+* Fix Defender features errors in Windows #104 | [d7761ab](https://github.com/undergroundwires/privacy.sexy/commit/d7761ab30e7f1e10a2919c196804d67511d6163a)
+* Fix unintendedly inlined Windows scripts | [f2d9881](https://github.com/undergroundwires/privacy.sexy/commit/f2d988138257ff184884e4adc83c39e3bc247e9b)
+* Fix Defender error due to non-english Windows #104 | [7c02ffb](https://github.com/undergroundwires/privacy.sexy/commit/7c02ffb6c95382b94f0b05e6f259cc418ec91c93)
+* Improve and unify disabling of Windows services | [70cdf38](https://github.com/undergroundwires/privacy.sexy/commit/70cdf3865a0de3214fc9e26fbdada4b0cb413c46)
+* Improve Windows defender docs and errors #104 | [d2518b1](https://github.com/undergroundwires/privacy.sexy/commit/d2518b11a7774ec58b9b46a691e2f013855bf0f9)
+* Unrecommend and complete Windows Push Notif. #101 | [c65209e](https://github.com/undergroundwires/privacy.sexy/commit/c65209e6a99230f15ace8955e8d5a6f3333d146b)
+
+[compare](https://github.com/undergroundwires/privacy.sexy/compare/0.11.1...0.11.2)
+
 ## 0.11.1 (2021-11-04)
 
 * Update dependencies | [64631a4](https://github.com/undergroundwires/privacy.sexy/commit/64631a4552fad7f7b06286aba8d3ca2d731f9342)

README.md

@@ -2,21 +2,104 @@
 
 > Enforce privacy & security best-practices on Windows and macOS, because privacy is sexy 🍑🍆
 
-[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](./CONTRIBUTING.md)
+<!-- markdownlint-disable MD033 -->
-[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/undergroundwires/privacy.sexy.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/undergroundwires/privacy.sexy/context:javascript)
+<p align="center">
-[![Maintainability](https://api.codeclimate.com/v1/badges/3a70b7ef602e2264342c/maintainability)](https://codeclimate.com/github/undergroundwires/privacy.sexy/maintainability)
+  <a href="https://github.com/undergroundwires/privacy.sexy/blob/master/CONTRIBUTING.md">
-[![Tests status](https://github.com/undergroundwires/privacy.sexy/workflows/Test/badge.svg)](https://github.com/undergroundwires/privacy.sexy/actions)
+    <img
-[![Quality checks status](https://github.com/undergroundwires/privacy.sexy/workflows/Quality%20checks/badge.svg)](https://github.com/undergroundwires/privacy.sexy/actions)
+      alt="contributions are welcome"
-[![Security checks status](https://github.com/undergroundwires/privacy.sexy/workflows/Security%20checks/badge.svg)](https://github.com/undergroundwires/privacy.sexy/actions)
+      src="https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat"
-[![Bump & release status](https://github.com/undergroundwires/privacy.sexy/workflows/Bump%20&%20release/badge.svg)](https://github.com/undergroundwires/privacy.sexy/actions)
+    />
-[![Deploy status](https://github.com/undergroundwires/privacy.sexy/workflows/Build%20&%20deploy/badge.svg)](https://github.com/undergroundwires/privacy.sexy/actions)
+  </a>
-[![Auto-versioned by bump-everywhere](https://github.com/undergroundwires/bump-everywhere/blob/master/badge.svg?raw=true)](https://github.com/undergroundwires/bump-everywhere)
+  <!-- Code quality -->
+  <br />
+  <a href="https://lgtm.com/projects/g/undergroundwires/privacy.sexy/context:javascript">
+    <img
+      alt="Language grade: JavaScript/TypeScript"
+      src="https://img.shields.io/lgtm/grade/javascript/g/undergroundwires/privacy.sexy.svg?logo=lgtm&logoWidth=18"
+    />
+  </a>
+  <a href="https://codeclimate.com/github/undergroundwires/privacy.sexy/maintainability">
+    <img
+      alt="Maintainability"
+      src="https://api.codeclimate.com/v1/badges/3a70b7ef602e2264342c/maintainability"
+    />
+  </a>
+  <!-- Tests -->
+  <br />
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/tests.unit.yaml">
+    <img
+      alt="Unit tests status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/unit-tests/badge.svg"
+    />
+  </a>
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/tests.integration.yaml">
+    <img
+      alt="Integration tests status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/integration-tests/badge.svg"
+    />
+  </a>
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/tests.e2e.yaml">
+    <img
+      alt="E2E tests status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/e2e-tests/badge.svg"
+    />
+  </a>
+  <!-- Checks -->
+  <br />
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/checks.quality.yaml">
+    <img
+      alt="Quality checks status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/quality-checks/badge.svg"
+    />
+  </a>
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/checks.security.yaml">
+    <img
+      alt="Security checks status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/security-checks/badge.svg"
+    />
+  </a>
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/checks.build.yaml">
+    <img
+      alt="Build checks status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/build-checks/badge.svg"
+    />
+  </a>
+  <!-- Release -->
+  <br />
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/release.git.yaml">
+    <img
+      alt="Git release status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/release-git/badge.svg"
+    />
+  </a>
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/release.site.yaml">
+    <img
+      alt="Site release status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/release-site/badge.svg"
+    />
+  </a>
+  <a href="https://github.com/undergroundwires/privacy.sexy/actions/workflows/release.desktop.yaml">
+    <img
+      alt="Desktop application release status"
+      src="https://github.com/undergroundwires/privacy.sexy/workflows/release-desktop/badge.svg"
+    />
+  </a>
+  <!-- Others -->
+  <br />
+  <a href="https://github.com/undergroundwires/bump-everywhere">
+    <img
+      alt="Auto-versioned by bump-everywhere"
+      src="https://github.com/undergroundwires/bump-everywhere/blob/master/badge.svg?raw=true"
+    />
+  </a>
+</p>
+<!-- markdownlint-restore -->
 
 ## Get started
 
 - Online version at [https://privacy.sexy](https://privacy.sexy)
   - 💡 No need to run any compiled software on your computer.
-- Alternatively download offline version for [Windows](https://github.com/undergroundwires/privacy.sexy/releases/download/0.11.1/privacy.sexy-Setup-0.11.1.exe), [macOS](https://github.com/undergroundwires/privacy.sexy/releases/download/0.11.1/privacy.sexy-0.11.1.dmg) or [Linux](https://github.com/undergroundwires/privacy.sexy/releases/download/0.11.1/privacy.sexy-0.11.1.AppImage).
+- Alternatively download offline version for [Windows](https://github.com/undergroundwires/privacy.sexy/releases/download/0.11.2/privacy.sexy-Setup-0.11.2.exe), [macOS](https://github.com/undergroundwires/privacy.sexy/releases/download/0.11.2/privacy.sexy-0.11.2.dmg) or [Linux](https://github.com/undergroundwires/privacy.sexy/releases/download/0.11.2/privacy.sexy-0.11.2.AppImage).
   - 💡 Single click to execute your script.
 - ❗ Come back regularly to apply latest version for stronger privacy and security.
 
@@ -49,6 +132,9 @@
 - Testing
   - Run unit tests: `npm run test:unit`
   - Run integration tests: `npm run test:integration`
+  - Run e2e (end-to-end) tests
+    - Interactive mode with GUI: `npm run test:e2e`
+    - Headless mode without GUI: `npm run test:e2e -- --headless`
   - Lint: `npm run lint`
 - **Desktop app**
   - Development: `npm run electron:serve`
@@ -57,8 +143,8 @@
   - Development: `npm run serve` to compile & hot-reload for development.
   - Production: `npm run build` to prepare files for distribution.
   - Or run using Docker:
-    1. Build: `docker build -t undergroundwires/privacy.sexy:0.11.1 .`
+    1. Build: `docker build -t undergroundwires/privacy.sexy:0.11.2 .`
-    2. Run: `docker run -it -p 8080:80 --rm --name privacy.sexy-0.11.1 undergroundwires/privacy.sexy:0.11.1`
+    2. Run: `docker run -it -p 8080:80 --rm --name privacy.sexy-0.11.2 undergroundwires/privacy.sexy:0.11.2`
 
 ## Architecture overview
 
@@ -84,5 +170,6 @@
 - CI/CD is fully automated for this repo using different GIT events & GitHub actions.
   - Versioning, tagging, creation of `CHANGELOG.md` and releasing is automated using [bump-everywhere](https://github.com/undergroundwires/bump-everywhere) action
 - Everything that's merged in the master goes directly to production.
+- 📖 Read more on [CI/CD pipelines](./docs/ci-cd.md)
 
 [![CI/CD to AWS with GitHub Actions](img/architecture/gitops.png)](.github/workflows/)

babel.config.js

@@ -1,5 +1,5 @@
 module.exports = {
   presets: [
-    '@vue/cli-plugin-babel/preset'
+    '@vue/cli-plugin-babel/preset',
-  ]
+  ],
-}
+};

cypress.json

@@ -0,0 +1,3 @@
+{
+  "pluginsFile": "tests/e2e/plugins/index.js"
+}

docs/ci-cd.md

@@ -0,0 +1,19 @@
+# Pipelines
+
+Pipelines are found under [`.github/workflows`](./../.github/workflows).
+
+## Pipeline types
+
+They are categorized based on their type:
+
+- `tests`: Different types of tests to verify functionality.
+- `checks`: Other controls such as vulnerability scans or styling checks.
+- `release`: Pipelines used for release of deployment such as building and testing.
+
+## Naming conventions
+
+Pipeline files are named using: **`<type>.<name>.yaml`**.
+
+**`type`**: Sub-folders do not work for GitHub workflows so that's why `<type>.` prefix is used. See also [pipeline types](#pipeline-types).
+
+**`name`**: Pipeline themselves are named using kebab case. It allows for easier URL references for their status badges. E.g. file name `tests.unit.yaml`, pipeline name: `name: unit-tests`

docs/tests.md

@@ -3,41 +3,59 @@
 - There are two different types of tests executed:
   1. [Unit tests](#unit-tests)
   2. [Integration tests](#integration-tests)
+  3. [End-to-end (E2E) tests](#e2e-tests)
+- All tests
+  - Uses [Mocha](https://mochajs.org/) and [Chai](https://www.chaijs.com/).
+  - Are written in files that includes `.spec` extension.
 - 💡 You can use path/module alias `@/tests` in import statements.
 
 ## Unit tests
 
-- Tests each component in isolation
+- Tests each component in isolation.
-- Defined in [`./tests/unit`](./../tests/unit)
+- Defined in [`./tests/unit`](./../tests/unit).
-- They follow same folder structure as [`./src`](./../src)
+- They follow same folder structure as [`./src`](./../src).
 
 ### Naming
 
-- Each test suite first describe the system under test
+- Each test suite first describe the system under test.
-  - E.g. tests for class `Application` is categorized under `Application`
+  - E.g. tests for class `Application` is categorized under `Application`.
-- Tests for specific methods are categorized under method name (if applicable)
+- Tests for specific methods are categorized under method name (if applicable).
-  - E.g. test for `run()` is categorized under `run`
+  - E.g. test for `run()` is categorized under `run`.
 
 ### Act, arrange, assert
 
-- Tests use act, arrange and assert (AAA) pattern when applicable
+- Tests use act, arrange and assert (AAA) pattern when applicable.
 - **Arrange**
-  - Should set up the test case
+  - Should set up the test case.
-  - Starts with comment line `// arrange`
+  - Starts with comment line `// arrange`.
 - **Act**
-  - Should cover the main thing to be tested
+  - Should cover the main thing to be tested.
-  - Starts with comment line `// act`
+  - Starts with comment line `// act`.
 - **Assert**
-  - Should elicit some sort of response
+  - Should elicit some sort of response.
-  - Starts with comment line `// assert`
+  - Starts with comment line `// assert`.
 
 ### Stubs
 
-- Stubs are defined in [`./tests/stubs`](./../tests/unit/stubs)
+- Stubs are defined in [`./tests/stubs`](./../tests/unit/stubs).
-- They implement dummy behavior to be functional
+- They implement dummy behavior to be functional.
 
 ## Integration tests
 
-- Tests functionality of a component in combination with others (not isolated)
+- Tests functionality of a component in combination with others (not isolated).
-- Ensure dependencies to third parties work as expected
+- Ensure dependencies to third parties work as expected.
-- Defined in [`./tests/integration`](./../tests/integration)
+- Defined in [`./tests/integration`](./../tests/integration).
+
+## E2E tests
+
+- Test the functionality and performance of a running application.
+- E2E tests are configured by vue plugin [`e2e-cypress`](https://github.com/vuejs/vue-cli/tree/dev/packages/@vue/cli-plugin-e2e-cypress#readme) for Vue CLI.
+- Names and folders are structured logically based on tests.
+- The structure is following:
+  - [`cypress.json`](./../cypress.json): Cypress configuration file.
+  - [`./tests/e2e/`](./../tests/e2e/): Base Cypress folder.
+    - [`/specs/`](./../tests/e2e/specs/): Test files, test are named with `.spec.js` extension.
+    - [`/plugins/index.js`](./../tests/e2e/plugins/index.js): Plugin file executed before project is loaded.
+    - [`/support/index.js`](./../tests/e2e/support/index.js): Support file, runs before every single spec file.
+    - *(Ignored)* `/videos`: Asset folder for videos taken during tests.
+    - *(Ignored)* `/screenshots`: Asset folder for Screenshots taken during tests.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "privacy.sexy",
-  "version": "0.11.1",
+  "version": "0.11.2",
   "private": true,
   "description": "Enforce privacy & security best-practices on Windows and macOS, because privacy is sexy 🍑🍆",
   "author": "undergroundwires",
@@ -8,17 +8,18 @@
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
     "test:unit": "vue-cli-service test:unit",
-    "test:integration": "vue-cli-service test:unit \"tests/integration/**/*.spec.ts\"",
+    "test:e2e": "vue-cli-service test:e2e",
-    "lint": "npm run lint:vue && npm run lint:yaml && npm run lint:md && npm run lint:md:relative-urls && npm run lint:md:consistency",
+    "lint": "npm run lint:md && npm run lint:md:consistency && npm run lint:md:relative-urls && npm run lint:eslint && npm run lint:yaml",
     "electron:build": "vue-cli-service electron:build",
     "electron:serve": "vue-cli-service electron:serve",
     "lint:md": "markdownlint **/*.md --ignore node_modules",
     "lint:md:consistency": "remark . --frail --use remark-preset-lint-consistent",
     "lint:md:relative-urls": "remark . --frail --use remark-validate-links",
-    "lint:vue": "vue-cli-service lint --no-fix",
+    "lint:eslint": "vue-cli-service lint --no-fix --mode production",
     "lint:yaml": "yamllint **/*.yaml --ignore=node_modules/**/*.yaml",
     "postinstall": "electron-builder install-app-deps",
-    "postuninstall": "electron-builder install-app-deps"
+    "postuninstall": "electron-builder install-app-deps",
+    "test:integration": "vue-cli-service test:unit \"tests/integration/**/*.spec.ts\""
   },
   "main": "background.js",
   "dependencies": {
@@ -47,16 +48,27 @@
     "@types/chai": "^4.2.22",
     "@types/file-saver": "^2.0.3",
     "@types/mocha": "^9.0.0",
-    "@vue/cli-plugin-babel": "^4.5.14",
+    "@typescript-eslint/eslint-plugin": "^5.4.0",
-    "@vue/cli-plugin-typescript": "^4.5.14",
+    "@typescript-eslint/parser": "^5.4.0",
-    "@vue/cli-plugin-unit-mocha": "^4.5.14",
+    "@vue/cli-plugin-babel": "~5.0.0-rc.1",
-    "@vue/cli-service": "^4.5.14",
+    "@vue/cli-plugin-e2e-cypress": "~5.0.0-rc.1",
+    "@vue/cli-plugin-eslint": "~5.0.0-rc.1",
+    "@vue/cli-plugin-typescript": "~5.0.0-rc.1",
+    "@vue/cli-plugin-unit-mocha": "~5.0.0-rc.1",
+    "@vue/cli-service": "~5.0.0-rc.1",
+    "@vue/eslint-config-airbnb": "^6.0.0",
+    "@vue/eslint-config-typescript": "^9.1.0",
     "@vue/test-utils": "1.2.2",
     "chai": "^4.3.4",
+    "cypress": "^8.3.0",
     "electron": "^15.3.0",
     "electron-devtools-installer": "^3.2.0",
     "electron-log": "^4.4.1",
     "electron-updater": "^4.3.9",
+    "eslint": "^7.32.0",
+    "eslint-plugin-import": "^2.25.3",
+    "eslint-plugin-vue": "^8.0.3",
+    "eslint-plugin-vuejs-accessibility": "^1.1.0",
     "js-yaml-loader": "^1.2.2",
     "markdownlint-cli": "^0.29.0",
     "raw-loader": "^4.0.2",
@@ -66,12 +78,16 @@
     "remark-validate-links": "^11.0.1",
     "sass": "^1.43.3",
     "sass-loader": "10.2.0",
+    "ts-loader": "9.0.1",
     "tslib": "^2.3.1",
     "typescript": "^4.4.4",
     "vue-cli-plugin-electron-builder": "^2.1.1",
     "vue-template-compiler": "^2.6.14",
     "yaml-lint": "^1.2.4"
   },
+  "//devDependencies": {
+    "ts-loader": "Here as workaround for vue-cli-plugin-electron-builder using older webpack 4"
+  },
   "homepage": "https://privacy.sexy",
   "repository": {
     "type": "git",

postcss.config.js

@@ -1,5 +1,5 @@
 module.exports = {
   plugins: {
-    autoprefixer: {}
+    autoprefixer: {},
-  }
+  },
-}
+};

src/application/ApplicationFactory.ts

@@ -8,13 +8,16 @@ const ApplicationGetter: ApplicationGetter = parseApplication;
 
 export class ApplicationFactory implements IApplicationFactory {
   public static readonly Current: IApplicationFactory = new ApplicationFactory(ApplicationGetter);
+
   private readonly getter: AsyncLazy<IApplication>;
+
   protected constructor(costlyGetter: ApplicationGetter) {
     if (!costlyGetter) {
       throw new Error('undefined getter');
     }
     this.getter = new AsyncLazy<IApplication>(() => Promise.resolve(costlyGetter()));
   }
+
   public getApp(): Promise<IApplication> {
     return this.getter.getValue();
   }

src/application/Common/Enum.ts

@@ -1,20 +1,25 @@
 // Because we cannot do "T extends enum" 😞 https://github.com/microsoft/TypeScript/issues/30611
 export type EnumType = number | string;
-export type EnumVariable<T extends EnumType, TEnumValue extends EnumType> = { [key in T]: TEnumValue };
+export type EnumVariable<T extends EnumType, TEnumValue extends EnumType>
+  = { [key in T]: TEnumValue };
 
 export interface IEnumParser<TEnum> {
   parseEnum(value: string, propertyName: string): TEnum;
 }
+
 export function createEnumParser<T extends EnumType, TEnumValue extends EnumType>(
-    enumVariable: EnumVariable<T, TEnumValue>): IEnumParser<TEnumValue> {
+  enumVariable: EnumVariable<T, TEnumValue>,
+): IEnumParser<TEnumValue> {
   return {
     parseEnum: (value, propertyName) => parseEnumValue(value, propertyName, enumVariable),
   };
 }
+
 function parseEnumValue<T extends EnumType, TEnumValue extends EnumType>(
   value: string,
   enumName: string,
-    enumVariable: EnumVariable<T, TEnumValue>): TEnumValue {
+  enumVariable: EnumVariable<T, TEnumValue>,
+): TEnumValue {
   if (!value) {
     throw new Error(`undefined ${enumName}`);
   }
@@ -29,22 +34,26 @@ function parseEnumValue<T extends EnumType, TEnumValue extends EnumType>(
   return enumVariable[casedValue as keyof typeof enumVariable];
 }
 
-export function getEnumNames<T extends EnumType, TEnumValue extends EnumType>(
+export function getEnumNames
-    enumVariable: EnumVariable<T, TEnumValue>): string[] {
+<T extends EnumType, TEnumValue extends EnumType>(
+  enumVariable: EnumVariable<T, TEnumValue>,
+): string[] {
   return Object
     .values(enumVariable)
     .filter((enumMember) => typeof enumMember === 'string') as string[];
 }
 
 export function getEnumValues<T extends EnumType, TEnumValue extends EnumType>(
-    enumVariable: EnumVariable<T, TEnumValue>): TEnumValue[] {
+  enumVariable: EnumVariable<T, TEnumValue>,
+): TEnumValue[] {
   return getEnumNames(enumVariable)
     .map((level) => enumVariable[level]) as TEnumValue[];
 }
 
 export function assertInRange<T extends EnumType, TEnumValue extends EnumType>(
   value: TEnumValue,
-    enumVariable: EnumVariable<T, TEnumValue>) {
+  enumVariable: EnumVariable<T, TEnumValue>,
+) {
   if (value === undefined) {
     throw new Error('undefined enum value');
   }

src/application/Common/ScriptingLanguage/ScriptingLanguageFactory.ts

@@ -1,6 +1,6 @@
 import { ScriptingLanguage } from '@/domain/ScriptingLanguage';
-import { IScriptingLanguageFactory } from './IScriptingLanguageFactory';
 import { assertInRange } from '@/application/Common/Enum';
+import { IScriptingLanguageFactory } from './IScriptingLanguageFactory';
 
 type Getter<T> = () => T;
 
@@ -27,5 +27,4 @@ export abstract class ScriptingLanguageFactory<T> implements IScriptingLanguageF
     }
     this.getters.set(language, getter);
   }
-
 }

src/application/Context/ApplicationContext.ts

@@ -1,17 +1,19 @@
-import { IApplicationContext, IApplicationContextChangedEvent } from './IApplicationContext';
-import { ICategoryCollectionState } from './State/ICategoryCollectionState';
-import { CategoryCollectionState } from './State/CategoryCollectionState';
 import { IApplication } from '@/domain/IApplication';
 import { OperatingSystem } from '@/domain/OperatingSystem';
 import { ICategoryCollection } from '@/domain/ICategoryCollection';
 import { EventSource } from '@/infrastructure/Events/EventSource';
 import { assertInRange } from '@/application/Common/Enum';
+import { CategoryCollectionState } from './State/CategoryCollectionState';
+import { ICategoryCollectionState } from './State/ICategoryCollectionState';
+import { IApplicationContext, IApplicationContextChangedEvent } from './IApplicationContext';
 
 type StateMachine = Map<OperatingSystem, ICategoryCollectionState>;
 
 export class ApplicationContext implements IApplicationContext {
   public readonly contextChanged = new EventSource<IApplicationContextChangedEvent>();
+
   public collection: ICategoryCollection;
+
   public currentOs: OperatingSystem;
 
   public get state(): ICategoryCollectionState {
@@ -19,9 +21,11 @@ export class ApplicationContext implements IApplicationContext {
   }
 
   private readonly states: StateMachine;
+
   public constructor(
     public readonly app: IApplication,
-        initialContext: OperatingSystem) {
+    initialContext: OperatingSystem,
+  ) {
     validateApp(app);
     assertInRange(initialContext, OperatingSystem);
     this.states = initializeStates(app);

src/application/Context/ApplicationContextFactory.ts

@@ -1,15 +1,16 @@
-import { ApplicationContext } from './ApplicationContext';
 import { IApplicationContext } from '@/application/Context/IApplicationContext';
 import { OperatingSystem } from '@/domain/OperatingSystem';
-import { Environment } from '../Environment/Environment';
 import { IApplication } from '@/domain/IApplication';
+import { Environment } from '../Environment/Environment';
 import { IEnvironment } from '../Environment/IEnvironment';
 import { IApplicationFactory } from '../IApplicationFactory';
 import { ApplicationFactory } from '../ApplicationFactory';
+import { ApplicationContext } from './ApplicationContext';
 
 export async function buildContext(
   factory: IApplicationFactory = ApplicationFactory.Current,
-    environment = Environment.CurrentEnvironment): Promise<IApplicationContext> {
+  environment = Environment.CurrentEnvironment,
+): Promise<IApplicationContext> {
   if (!factory) { throw new Error('undefined factory'); }
   if (!environment) { throw new Error('undefined environment'); }
   const app = await factory.getApp();

src/application/Context/IApplicationContext.ts

@@ -1,12 +1,16 @@
-import { ICategoryCollectionState } from './State/ICategoryCollectionState';
 import { OperatingSystem } from '@/domain/OperatingSystem';
 import { IEventSource } from '@/infrastructure/Events/IEventSource';
 import { IApplication } from '@/domain/IApplication';
+import { ICategoryCollectionState, IReadOnlyCategoryCollectionState } from './State/ICategoryCollectionState';
 
-export interface IApplicationContext {
+export interface IReadOnlyApplicationContext {
   readonly app: IApplication;
-    readonly state: ICategoryCollectionState;
+  readonly state: IReadOnlyCategoryCollectionState;
   readonly contextChanged: IEventSource<IApplicationContextChangedEvent>;
+}
+
+export interface IApplicationContext extends IReadOnlyApplicationContext {
+    readonly state: ICategoryCollectionState;
     changeContext(os: OperatingSystem): void;
 }
 

src/application/Context/State/CategoryCollectionState.ts

@@ -1,3 +1,5 @@
+import { ICategoryCollection } from '@/domain/ICategoryCollection';
+import { OperatingSystem } from '@/domain/OperatingSystem';
 import { UserFilter } from './Filter/UserFilter';
 import { IUserFilter } from './Filter/IUserFilter';
 import { ApplicationCode } from './Code/ApplicationCode';
@@ -5,13 +7,14 @@ import { UserSelection } from './Selection/UserSelection';
 import { IUserSelection } from './Selection/IUserSelection';
 import { ICategoryCollectionState } from './ICategoryCollectionState';
 import { IApplicationCode } from './Code/IApplicationCode';
-import { ICategoryCollection } from '../../../domain/ICategoryCollection';
-import { OperatingSystem } from '@/domain/OperatingSystem';
 
 export class CategoryCollectionState implements ICategoryCollectionState {
   public readonly os: OperatingSystem;
+
   public readonly code: IApplicationCode;
+
   public readonly selection: IUserSelection;
+
   public readonly filter: IUserFilter;
 
   public constructor(readonly collection: ICategoryCollection) {

src/application/Context/State/Code/ApplicationCode.ts

@@ -1,24 +1,26 @@
+import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
+import { IReadOnlyUserSelection } from '@/application/Context/State/Selection/IUserSelection';
+import { EventSource } from '@/infrastructure/Events/EventSource';
+import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
 import { CodeChangedEvent } from './Event/CodeChangedEvent';
 import { CodePosition } from './Position/CodePosition';
 import { ICodeChangedEvent } from './Event/ICodeChangedEvent';
-import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
-import { IUserSelection } from '@/application/Context/State/Selection/IUserSelection';
 import { UserScriptGenerator } from './Generation/UserScriptGenerator';
-import { EventSource } from '@/infrastructure/Events/EventSource';
 import { IApplicationCode } from './IApplicationCode';
 import { IUserScriptGenerator } from './Generation/IUserScriptGenerator';
-import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
 
 export class ApplicationCode implements IApplicationCode {
   public readonly changed = new EventSource<ICodeChangedEvent>();
+
   public current: string;
 
   private scriptPositions = new Map<SelectedScript, CodePosition>();
 
   constructor(
-        userSelection: IUserSelection,
+    userSelection: IReadOnlyUserSelection,
     private readonly scriptingDefinition: IScriptingDefinition,
-        private readonly generator: IUserScriptGenerator = new UserScriptGenerator()) {
+    private readonly generator: IUserScriptGenerator = new UserScriptGenerator(),
+  ) {
     if (!userSelection) { throw new Error('userSelection is null or undefined'); }
     if (!scriptingDefinition) { throw new Error('scriptingDefinition is null or undefined'); }
     if (!generator) { throw new Error('generator is null or undefined'); }

src/application/Context/State/Code/Event/CodeChangedEvent.ts

@@ -1,12 +1,15 @@
-import { ICodeChangedEvent } from './ICodeChangedEvent';
-import { SelectedScript } from '../../Selection/SelectedScript';
 import { IScript } from '@/domain/IScript';
 import { ICodePosition } from '@/application/Context/State/Code/Position/ICodePosition';
+import { SelectedScript } from '../../Selection/SelectedScript';
+import { ICodeChangedEvent } from './ICodeChangedEvent';
 
 export class CodeChangedEvent implements ICodeChangedEvent {
   public readonly code: string;
+
   public readonly addedScripts: ReadonlyArray<IScript>;
+
   public readonly removedScripts: ReadonlyArray<IScript>;
+
   public readonly changedScripts: ReadonlyArray<IScript>;
 
   private readonly scripts: Map<IScript, ICodePosition>;
@@ -14,7 +17,8 @@ export class CodeChangedEvent implements ICodeChangedEvent {
   constructor(
     code: string,
     oldScripts: ReadonlyArray<SelectedScript>,
-        scripts: Map<SelectedScript, ICodePosition>) {
+    scripts: Map<SelectedScript, ICodePosition>,
+  ) {
     ensureAllPositionsExist(code, Array.from(scripts.values()));
     this.code = code;
     const newScripts = Array.from(scripts.keys());
@@ -38,17 +42,19 @@ export class CodeChangedEvent implements ICodeChangedEvent {
 
 function ensureAllPositionsExist(script: string, positions: ReadonlyArray<ICodePosition>) {
   const totalLines = script.split(/\r\n|\r|\n/).length;
-    for (const position of positions) {
+  const missingPositions = positions.filter((position) => position.endLine > totalLines);
-        if (position.endLine > totalLines) {
+  if (missingPositions.length > 0) {
-            throw new Error(`script end line (${position.endLine}) is out of range.` +
+    throw new Error(
-                            `(total code lines: ${totalLines}`);
+      `Out of range script end line: "${missingPositions.map((pos) => pos.endLine).join('", "')}"`
-        }
+        + `(total code lines: ${totalLines}).`,
+    );
   }
 }
 
 function getChangedScripts(
   oldScripts: ReadonlyArray<SelectedScript>,
-    newScripts: ReadonlyArray<SelectedScript>): ReadonlyArray<IScript> {
+  newScripts: ReadonlyArray<SelectedScript>,
+): ReadonlyArray<IScript> {
   return newScripts
     .filter((newScript) => oldScripts.find((oldScript) => oldScript.id === newScript.id
       && oldScript.revert !== newScript.revert))
@@ -57,7 +63,8 @@ function getChangedScripts(
 
 function selectIfNotExists(
   selectableContainer: ReadonlyArray<SelectedScript>,
-    test: ReadonlyArray<SelectedScript>) {
+  test: ReadonlyArray<SelectedScript>,
+) {
   return selectableContainer
     .filter((script) => !test.find((oldScript) => oldScript.id === script.id))
     .map((selection) => selection.script);

src/application/Context/State/Code/Generation/CodeBuilder.ts

@@ -17,14 +17,13 @@ export abstract class CodeBuilder implements ICodeBuilder {
       return this;
     }
     const lines = code.match(/[^\r\n]+/g);
-        for (const line of lines) {
+    this.lines.push(...lines);
-            this.lines.push(line);
-        }
     return this;
   }
 
   public appendTrailingHyphensCommentLine(
-        totalRepeatHyphens: number = TotalFunctionSeparatorChars): CodeBuilder {
+    totalRepeatHyphens: number = TotalFunctionSeparatorChars,
+  ): CodeBuilder {
     return this.appendCommentLine('-'.repeat(totalRepeatHyphens));
   }
 
@@ -45,7 +44,8 @@ export abstract class CodeBuilder implements ICodeBuilder {
 
   public appendCommentLineWithHyphensAround(
     sectionName: string,
-        totalRepeatHyphens: number = TotalFunctionSeparatorChars): CodeBuilder {
+    totalRepeatHyphens: number = TotalFunctionSeparatorChars,
+  ): CodeBuilder {
     if (!sectionName) { throw new Error('sectionName cannot be empty or null'); }
     if (sectionName.length >= totalRepeatHyphens) {
       return this.appendCommentLine(sectionName);
@@ -63,5 +63,6 @@ export abstract class CodeBuilder implements ICodeBuilder {
   }
 
   protected abstract getCommentDelimiter(): string;
+
   protected abstract writeStandardOut(text: string): string;
 }

src/application/Context/State/Code/Generation/CodeBuilderFactory.ts

@@ -5,7 +5,9 @@ import { BatchBuilder } from './Languages/BatchBuilder';
 import { ShellBuilder } from './Languages/ShellBuilder';
 import { ICodeBuilderFactory } from './ICodeBuilderFactory';
 
-export class CodeBuilderFactory extends ScriptingLanguageFactory<ICodeBuilder> implements ICodeBuilderFactory {
+export class CodeBuilderFactory
+  extends ScriptingLanguageFactory<ICodeBuilder>
+  implements ICodeBuilderFactory {
   constructor() {
     super();
     this.registerGetter(ScriptingLanguage.shellscript, () => new ShellBuilder());

src/application/Context/State/Code/Generation/ICodeBuilderFactory.ts

@@ -1,5 +1,4 @@
-import { ICodeBuilder } from './ICodeBuilder';
 import { IScriptingLanguageFactory } from '@/application/Common/ScriptingLanguage/IScriptingLanguageFactory';
+import { ICodeBuilder } from './ICodeBuilder';
 
-export interface ICodeBuilderFactory extends IScriptingLanguageFactory<ICodeBuilder> {
+export type ICodeBuilderFactory = IScriptingLanguageFactory<ICodeBuilder>;
-}

src/application/Context/State/Code/Generation/IUserScriptGenerator.ts

@@ -1,6 +1,6 @@
 import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
-import { IUserScript } from './IUserScript';
 import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
+import { IUserScript } from './IUserScript';
 
 export interface IUserScriptGenerator {
   buildCode(

src/application/Context/State/Code/Generation/Languages/BatchBuilder.ts

@@ -4,6 +4,7 @@ export class BatchBuilder extends CodeBuilder {
   protected getCommentDelimiter(): string {
     return '::';
   }
+
   protected writeStandardOut(text: string): string {
     return `echo ${escapeForEcho(text)}`;
   }

src/application/Context/State/Code/Generation/Languages/ShellBuilder.ts

@@ -4,6 +4,7 @@ export class ShellBuilder extends CodeBuilder {
   protected getCommentDelimiter(): string {
     return '#';
   }
+
   protected writeStandardOut(text: string): string {
     return `echo '${escapeForEcho(text)}'`;
   }

src/application/Context/State/Code/Generation/UserScriptGenerator.ts

@@ -1,9 +1,9 @@
 import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
-import { IUserScriptGenerator } from './IUserScriptGenerator';
 import { ICodePosition } from '@/application/Context/State/Code/Position/ICodePosition';
-import { CodePosition } from '../Position/CodePosition';
-import { IUserScript } from './IUserScript';
 import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
+import { CodePosition } from '../Position/CodePosition';
+import { IUserScriptGenerator } from './IUserScriptGenerator';
+import { IUserScript } from './IUserScript';
 import { ICodeBuilder } from './ICodeBuilder';
 import { ICodeBuilderFactory } from './ICodeBuilderFactory';
 import { CodeBuilderFactory } from './CodeBuilderFactory';
@@ -12,20 +12,21 @@ export class UserScriptGenerator implements IUserScriptGenerator {
   constructor(private readonly codeBuilderFactory: ICodeBuilderFactory = new CodeBuilderFactory()) {
 
   }
+
   public buildCode(
     selectedScripts: ReadonlyArray<SelectedScript>,
-        scriptingDefinition: IScriptingDefinition): IUserScript {
+    scriptingDefinition: IScriptingDefinition,
+  ): IUserScript {
     if (!selectedScripts) { throw new Error('undefined scripts'); }
     if (!scriptingDefinition) { throw new Error('undefined definition'); }
-        let scriptPositions = new Map<SelectedScript, ICodePosition>();
     if (!selectedScripts.length) {
-            return { code: '', scriptPositions };
+      return { code: '', scriptPositions: new Map<SelectedScript, ICodePosition>() };
     }
     let builder = this.codeBuilderFactory.create(scriptingDefinition.language);
     builder = initializeCode(scriptingDefinition.startCode, builder);
-        for (const selection of selectedScripts) {
+    const scriptPositions = selectedScripts.reduce((result, selection) => {
-            scriptPositions = appendSelection(selection, scriptPositions, builder);
+      return appendSelection(selection, result, builder);
-        }
+    }, new Map<SelectedScript, ICodePosition>());
     const code = finalizeCode(builder, scriptingDefinition.endCode);
     return { code, scriptPositions };
   }
@@ -52,9 +53,11 @@ function finalizeCode(builder: ICodeBuilder, endCode: string): string {
 function appendSelection(
   selection: SelectedScript,
   scriptPositions: Map<SelectedScript, ICodePosition>,
-    builder: ICodeBuilder): Map<SelectedScript, ICodePosition> {
+  builder: ICodeBuilder,
-    const startPosition = builder.currentLine + 1; // Because first line will be empty to separate scripts
+): Map<SelectedScript, ICodePosition> {
-    builder = appendCode(selection, builder);
+  // Start from next line because first line will be empty to separate scripts
+  const startPosition = builder.currentLine + 1;
+  appendCode(selection, builder);
   const endPosition = builder.currentLine - 1;
   builder.appendLine();
   const position = new CodePosition(startPosition, endPosition);
@@ -63,8 +66,9 @@ function appendSelection(
 }
 
 function appendCode(selection: SelectedScript, builder: ICodeBuilder): ICodeBuilder {
-    const name = selection.revert ? `${selection.script.name} (revert)` : selection.script.name;
+  const { script } = selection;
-    const scriptCode = selection.revert ? selection.script.code.revert : selection.script.code.execute;
+  const name = selection.revert ? `${script.name} (revert)` : script.name;
+  const scriptCode = selection.revert ? script.code.revert : script.code.execute;
   return builder
     .appendLine()
     .appendFunction(name, scriptCode);

src/application/Context/State/Code/IApplicationCode.ts

@@ -1,5 +1,5 @@
-import { ICodeChangedEvent } from './Event/ICodeChangedEvent';
 import { IEventSource } from '@/infrastructure/Events/IEventSource';
+import { ICodeChangedEvent } from './Event/ICodeChangedEvent';
 
 export interface IApplicationCode {
   readonly changed: IEventSource<ICodeChangedEvent>;

src/application/Context/State/Code/Position/CodePosition.ts

@@ -7,7 +7,8 @@ export class CodePosition implements ICodePosition {
 
   constructor(
     public readonly startLine: number,
-        public readonly endLine: number) {
+    public readonly endLine: number,
+  ) {
     if (startLine < 0) {
       throw new Error('Code cannot start in a negative line');
     }

src/application/Context/State/Filter/FilterResult.ts

@@ -1,16 +1,18 @@
-import { IFilterResult } from './IFilterResult';
 import { IScript } from '@/domain/IScript';
 import { ICategory } from '@/domain/ICategory';
+import { IFilterResult } from './IFilterResult';
 
 export class FilterResult implements IFilterResult {
   constructor(
     public readonly scriptMatches: ReadonlyArray<IScript>,
     public readonly categoryMatches: ReadonlyArray<ICategory>,
-        public readonly query: string) {
+    public readonly query: string,
+  ) {
     if (!query) { throw new Error('Query is empty or undefined'); }
     if (!scriptMatches) { throw new Error('Script matches is undefined'); }
     if (!categoryMatches) { throw new Error('Category matches is undefined'); }
   }
+
   public hasAnyMatches(): boolean {
     return this.scriptMatches.length > 0
       || this.categoryMatches.length > 0;

src/application/Context/State/Filter/IUserFilter.ts

@@ -1,10 +1,13 @@
 import { IEventSource } from '@/infrastructure/Events/IEventSource';
 import { IFilterResult } from './IFilterResult';
 
-export interface IUserFilter {
+export interface IReadOnlyUserFilter {
   readonly currentFilter: IFilterResult | undefined;
   readonly filtered: IEventSource<IFilterResult>;
   readonly filterRemoved: IEventSource<void>;
+}
+
+export interface IUserFilter extends IReadOnlyUserFilter {
   setFilter(filter: string): void;
   removeFilter(): void;
 }

src/application/Context/State/Filter/UserFilter.ts

@@ -1,13 +1,15 @@
 import { IScript } from '@/domain/IScript';
+import { EventSource } from '@/infrastructure/Events/EventSource';
+import { ICategoryCollection } from '@/domain/ICategoryCollection';
 import { FilterResult } from './FilterResult';
 import { IFilterResult } from './IFilterResult';
 import { IUserFilter } from './IUserFilter';
-import { EventSource } from '@/infrastructure/Events/EventSource';
-import { ICategoryCollection } from '@/domain/ICategoryCollection';
 
 export class UserFilter implements IUserFilter {
   public readonly filtered = new EventSource<IFilterResult>();
+
   public readonly filterRemoved = new EventSource<void>();
+
   public currentFilter: IFilterResult | undefined;
 
   constructor(private collection: ICategoryCollection) {
@@ -20,9 +22,11 @@ export class UserFilter implements IUserFilter {
     }
     const filterLowercase = filter.toLocaleLowerCase();
     const filteredScripts = this.collection.getAllScripts().filter(
-            (script) => isScriptAMatch(script, filterLowercase));
+      (script) => isScriptAMatch(script, filterLowercase),
+    );
     const filteredCategories = this.collection.getAllCategories().filter(
-            (category) => category.name.toLowerCase().includes(filterLowercase));
+      (category) => category.name.toLowerCase().includes(filterLowercase),
+    );
     const matches = new FilterResult(
       filteredScripts,
       filteredCategories,

src/application/Context/State/ICategoryCollectionState.ts

@@ -1,13 +1,18 @@
-import { IUserFilter } from './Filter/IUserFilter';
-import { IUserSelection } from './Selection/IUserSelection';
-import { IApplicationCode } from './Code/IApplicationCode';
 import { ICategoryCollection } from '@/domain/ICategoryCollection';
 import { OperatingSystem } from '@/domain/OperatingSystem';
+import { IReadOnlyUserFilter, IUserFilter } from './Filter/IUserFilter';
+import { IReadOnlyUserSelection, IUserSelection } from './Selection/IUserSelection';
+import { IApplicationCode } from './Code/IApplicationCode';
 
-export interface ICategoryCollectionState {
+export interface IReadOnlyCategoryCollectionState {
   readonly code: IApplicationCode;
+  readonly os: OperatingSystem;
+  readonly filter: IReadOnlyUserFilter;
+  readonly selection: IReadOnlyUserSelection;
+  readonly collection: ICategoryCollection;
+}
+
+export interface ICategoryCollectionState extends IReadOnlyCategoryCollectionState {
   readonly filter: IUserFilter;
   readonly selection: IUserSelection;
-    readonly collection: ICategoryCollection;
-    readonly os: OperatingSystem;
 }

src/application/Context/State/Selection/IUserSelection.ts

@@ -1,20 +1,23 @@
-import { SelectedScript } from './SelectedScript';
 import { IScript } from '@/domain/IScript';
 import { ICategory } from '@/domain/ICategory';
 import { IEventSource } from '@/infrastructure/Events/IEventSource';
+import { SelectedScript } from './SelectedScript';
 
-export interface IUserSelection {
+export interface IReadOnlyUserSelection {
   readonly changed: IEventSource<ReadonlyArray<SelectedScript>>;
   readonly selectedScripts: ReadonlyArray<SelectedScript>;
+  isSelected(scriptId: string): boolean;
   areAllSelected(category: ICategory): boolean;
   isAnySelected(category: ICategory): boolean;
+}
+
+export interface IUserSelection extends IReadOnlyUserSelection {
   removeAllInCategory(categoryId: number): void;
   addOrUpdateAllInCategory(categoryId: number, revert: boolean): void;
   addSelectedScript(scriptId: string, revert: boolean): void;
   addOrUpdateSelectedScript(scriptId: string, revert: boolean): void;
   removeSelectedScript(scriptId: string): void;
   selectOnly(scripts: ReadonlyArray<IScript>): void;
-    isSelected(scriptId: string): boolean;
   selectAll(): void;
   deselectAll(): void;
 }

src/application/Context/State/Selection/UserSelection.ts

@@ -1,26 +1,26 @@
-import { SelectedScript } from './SelectedScript';
-import { IUserSelection } from './IUserSelection';
 import { InMemoryRepository } from '@/infrastructure/Repository/InMemoryRepository';
 import { IScript } from '@/domain/IScript';
 import { EventSource } from '@/infrastructure/Events/EventSource';
 import { IRepository } from '@/infrastructure/Repository/IRepository';
 import { ICategory } from '@/domain/ICategory';
 import { ICategoryCollection } from '@/domain/ICategoryCollection';
+import { IUserSelection } from './IUserSelection';
+import { SelectedScript } from './SelectedScript';
 
 export class UserSelection implements IUserSelection {
   public readonly changed = new EventSource<ReadonlyArray<SelectedScript>>();
+
   private readonly scripts: IRepository<string, SelectedScript>;
 
   constructor(
     private readonly collection: ICategoryCollection,
-        selectedScripts: ReadonlyArray<SelectedScript>) {
+    selectedScripts: ReadonlyArray<SelectedScript>,
+  ) {
     this.scripts = new InMemoryRepository<string, SelectedScript>();
-        if (selectedScripts && selectedScripts.length > 0) {
     for (const script of selectedScripts) {
       this.scripts.addItem(script);
     }
   }
-    }
 
   public areAllSelected(category: ICategory): boolean {
     if (this.selectedScripts.length === 0) {
@@ -30,7 +30,9 @@ export class UserSelection implements IUserSelection {
     if (this.selectedScripts.length < scripts.length) {
       return false;
     }
-        return scripts.every((script) => this.selectedScripts.some((selected) => selected.id === script.id));
+    return scripts.every(
+      (script) => this.selectedScripts.some((selected) => selected.id === script.id),
+    );
   }
 
   public isAnySelected(category: ICategory): boolean {
@@ -53,19 +55,20 @@ export class UserSelection implements IUserSelection {
     this.changed.notify(this.scripts.getItems());
   }
 
-    public addOrUpdateAllInCategory(categoryId: number, revert: boolean = false): void {
+  public addOrUpdateAllInCategory(categoryId: number, revert = false): void {
-        const category = this.collection.findCategory(categoryId);
+    const scriptsToAddOrUpdate = this.collection
-        const scriptsToAddOrUpdate = category.getAllScriptsRecursively()
+      .findCategory(categoryId)
-            .filter((script) =>
+      .getAllScriptsRecursively()
-                !this.scripts.exists(script.id)
+      .filter(
+        (script) => !this.scripts.exists(script.id)
           || this.scripts.getById(script.id).revert !== revert,
-            );
+      )
+      .map((script) => new SelectedScript(script, revert));
     if (!scriptsToAddOrUpdate.length) {
       return;
     }
     for (const script of scriptsToAddOrUpdate) {
-            const selectedScript = new SelectedScript(script, revert);
+      this.scripts.addOrUpdateItem(script);
-            this.scripts.addOrUpdateItem(selectedScript);
     }
     this.changed.notify(this.scripts.getItems());
   }
@@ -102,11 +105,12 @@ export class UserSelection implements IUserSelection {
   }
 
   public selectAll(): void {
-        for (const script of this.collection.getAllScripts()) {
+    const scriptsToSelect = this.collection
-            if (!this.scripts.exists(script.id)) {
+      .getAllScripts()
-                const selection = new SelectedScript(script, false);
+      .filter((script) => !this.scripts.exists(script.id))
-                this.scripts.addItem(selection);
+      .map((script) => new SelectedScript(script, false));
-            }
+    for (const script of scriptsToSelect) {
+      this.scripts.addItem(script);
     }
     this.changed.notify(this.scripts.getItems());
   }
@@ -131,10 +135,11 @@ export class UserSelection implements IUserSelection {
         .forEach((scriptId) => this.scripts.removeItem(scriptId));
     }
     // Select from unselected scripts
-        const unselectedScripts = scripts.filter((script) => !this.scripts.exists(script.id));
+    const unselectedScripts = scripts
+      .filter((script) => !this.scripts.exists(script.id))
+      .map((script) => new SelectedScript(script, false));
     for (const toSelect of unselectedScripts) {
-            const selection = new SelectedScript(toSelect, false);
+      this.scripts.addItem(toSelect);
-            this.scripts.addItem(selection);
     }
     this.changed.notify(this.scripts.getItems());
   }

src/application/Environment/BrowserOs/BrowserOsDetector.ts

@@ -4,6 +4,7 @@ import { IBrowserOsDetector } from './IBrowserOsDetector';
 
 export class BrowserOsDetector implements IBrowserOsDetector {
   private readonly detectors = BrowserDetectors;
+
   public detect(userAgent: string): OperatingSystem | undefined {
     if (!userAgent) {
       return undefined;
@@ -19,35 +20,37 @@ export class BrowserOsDetector implements IBrowserOsDetector {
 }
 
 // Reference: https://github.com/keithws/browser-report/blob/master/index.js#L304
-const BrowserDetectors =
+const BrowserDetectors = [
-[
+  define(OperatingSystem.KaiOS, (b) => b
-    define(OperatingSystem.KaiOS, (b) =>
+    .mustInclude('KAIOS')),
-        b.mustInclude('KAIOS')),
+  define(OperatingSystem.ChromeOS, (b) => b
-    define(OperatingSystem.ChromeOS, (b) =>
+    .mustInclude('CrOS')),
-        b.mustInclude('CrOS')),
+  define(OperatingSystem.BlackBerryOS, (b) => b
-    define(OperatingSystem.BlackBerryOS, (b) =>
+    .mustInclude('BlackBerry')),
-        b.mustInclude('BlackBerry')),
+  define(OperatingSystem.BlackBerryTabletOS, (b) => b
-    define(OperatingSystem.BlackBerryTabletOS, (b) =>
+    .mustInclude('RIM Tablet OS')),
-        b.mustInclude('RIM Tablet OS')),
+  define(OperatingSystem.BlackBerry, (b) => b
-    define(OperatingSystem.BlackBerry, (b) =>
+    .mustInclude('BB10')),
-        b.mustInclude('BB10')),
+  define(OperatingSystem.Android, (b) => b
-    define(OperatingSystem.Android, (b) =>
+    .mustInclude('Android').mustNotInclude('Windows Phone')),
-        b.mustInclude('Android').mustNotInclude('Windows Phone')),
+  define(OperatingSystem.Android, (b) => b
-    define(OperatingSystem.Android, (b) =>
+    .mustInclude('Adr').mustNotInclude('Windows Phone')),
-        b.mustInclude('Adr').mustNotInclude('Windows Phone')),
+  define(OperatingSystem.iOS, (b) => b
-    define(OperatingSystem.iOS, (b) =>
+    .mustInclude('like Mac OS X')),
-        b.mustInclude('like Mac OS X')),
+  define(OperatingSystem.Linux, (b) => b
-    define(OperatingSystem.Linux, (b) =>
+    .mustInclude('Linux').mustNotInclude('Android').mustNotInclude('Adr')),
-        b.mustInclude('Linux').mustNotInclude('Android').mustNotInclude('Adr')),
+  define(OperatingSystem.Windows, (b) => b
-    define(OperatingSystem.Windows, (b) =>
+    .mustInclude('Windows').mustNotInclude('Windows Phone')),
-        b.mustInclude('Windows').mustNotInclude('Windows Phone')),
+  define(OperatingSystem.WindowsPhone, (b) => b
-    define(OperatingSystem.WindowsPhone, (b) =>
+    .mustInclude('Windows Phone')),
-        b.mustInclude('Windows Phone')),
+  define(OperatingSystem.macOS, (b) => b
-    define(OperatingSystem.macOS, (b) =>
+    .mustInclude('OS X').mustNotInclude('Android').mustNotInclude('like Mac OS X')),
-        b.mustInclude('OS X').mustNotInclude('Android').mustNotInclude('like Mac OS X')),
 ];
 
-function define(os: OperatingSystem, applyRules: (builder: DetectorBuilder) => DetectorBuilder): IBrowserOsDetector {
+function define(
+  os: OperatingSystem,
+  applyRules: (builder: DetectorBuilder) => DetectorBuilder,
+): IBrowserOsDetector {
   const builder = new DetectorBuilder(os);
   applyRules(builder);
   return builder.build();

src/application/Environment/BrowserOs/DetectorBuilder.ts

@@ -1,8 +1,9 @@
-import { IBrowserOsDetector } from './IBrowserOsDetector';
 import { OperatingSystem } from '@/domain/OperatingSystem';
+import { IBrowserOsDetector } from './IBrowserOsDetector';
 
 export class DetectorBuilder {
   private readonly existingPartsInUserAgent = new Array<string>();
+
   private readonly notExistingPartsInUserAgent = new Array<string>();
 
   constructor(private readonly os: OperatingSystem) { }

src/application/Environment/Environment.ts

@@ -1,9 +1,9 @@
+import { OperatingSystem } from '@/domain/OperatingSystem';
 import { BrowserOsDetector } from './BrowserOs/BrowserOsDetector';
 import { IBrowserOsDetector } from './BrowserOs/IBrowserOsDetector';
 import { IEnvironment } from './IEnvironment';
-import { OperatingSystem } from '@/domain/OperatingSystem';
 
-interface IEnvironmentVariables {
+export interface IEnvironmentVariables {
   readonly window: Window & typeof globalThis;
   readonly process: NodeJS.Process;
   readonly navigator: Navigator;
@@ -12,21 +12,28 @@ interface IEnvironmentVariables {
 export class Environment implements IEnvironment {
   public static readonly CurrentEnvironment: IEnvironment = new Environment({
     window,
-        process,
+    process: typeof process !== 'undefined' ? process /* electron only */ : undefined,
     navigator,
   });
+
   public readonly isDesktop: boolean;
+
   public readonly os: OperatingSystem;
+
   protected constructor(
     variables: IEnvironmentVariables,
-      browserOsDetector: IBrowserOsDetector = new BrowserOsDetector()) {
+    browserOsDetector: IBrowserOsDetector = new BrowserOsDetector(),
+  ) {
     if (!variables) {
       throw new Error('variables is null or empty');
     }
     this.isDesktop = isDesktop(variables);
-        this.os = this.isDesktop ?
+    if (this.isDesktop) {
-            getDesktopOsType(getProcessPlatform(variables))
+      this.os = getDesktopOsType(getProcessPlatform(variables));
-          : browserOsDetector.detect(getUserAgent(variables));
+    } else {
+      const userAgent = getUserAgent(variables);
+      this.os = !userAgent ? undefined : browserOsDetector.detect(userAgent);
+    }
   }
 }
 
@@ -46,15 +53,17 @@ function getProcessPlatform(variables: IEnvironmentVariables): string {
 
 function getDesktopOsType(processPlatform: string): OperatingSystem | undefined {
   // https://nodejs.org/api/process.html#process_process_platform
-    if (processPlatform === 'darwin') {
+  switch (processPlatform) {
+    case 'darwin':
       return OperatingSystem.macOS;
-    } else if (processPlatform === 'win32') {
+    case 'win32':
       return OperatingSystem.Windows;
-    } else if (processPlatform === 'linux') {
+    case 'linux':
       return OperatingSystem.Linux;
-    }
+    default:
       return undefined;
   }
+}
 
 function isDesktop(variables: IEnvironmentVariables): boolean {
   // More: https://github.com/electron/electron/issues/2288

src/application/Parser/ApplicationParser.ts

@@ -1,17 +1,18 @@
+import { CollectionData } from 'js-yaml-loader!@/*';
 import { IApplication } from '@/domain/IApplication';
 import { IProjectInformation } from '@/domain/IProjectInformation';
 import { ICategoryCollection } from '@/domain/ICategoryCollection';
-import { parseCategoryCollection } from './CategoryCollectionParser';
 import WindowsData from 'js-yaml-loader!@/application/collections/windows.yaml';
 import MacOsData from 'js-yaml-loader!@/application/collections/macos.yaml';
-import { CollectionData } from 'js-yaml-loader!@/*';
 import { parseProjectInformation } from '@/application/Parser/ProjectInformationParser';
 import { Application } from '@/domain/Application';
+import { parseCategoryCollection } from './CategoryCollectionParser';
 
 export function parseApplication(
   parser = CategoryCollectionParser,
   processEnv: NodeJS.ProcessEnv = process.env,
-    collectionsData = PreParsedCollections): IApplication {
+  collectionsData = PreParsedCollections,
+): IApplication {
   validateCollectionsData(collectionsData);
   const information = parseProjectInformation(processEnv);
   const collections = collectionsData.map((collection) => parser(collection, information));
@@ -22,11 +23,13 @@ export function parseApplication(
 export type CategoryCollectionParserType
     = (file: CollectionData, info: IProjectInformation) => ICategoryCollection;
 
-const CategoryCollectionParser: CategoryCollectionParserType
+const CategoryCollectionParser: CategoryCollectionParserType = (file, info) => {
-    = (file, info) => parseCategoryCollection(file, info);
+  return parseCategoryCollection(file, info);
+};
 
-const PreParsedCollections: readonly CollectionData []
+const PreParsedCollections: readonly CollectionData [] = [
-    = [ WindowsData, MacOsData ];
+  WindowsData, MacOsData,
+];
 
 function validateCollectionsData(collections: readonly CollectionData[]) {
   if (!collections.length) {

src/application/Parser/CategoryCollectionParser.ts

@@ -1,32 +1,29 @@
-import { Category } from '@/domain/Category';
 import { CollectionData } from 'js-yaml-loader!@/*';
-import { parseCategory } from './CategoryParser';
 import { OperatingSystem } from '@/domain/OperatingSystem';
-import { createEnumParser } from '../Common/Enum';
 import { ICategoryCollection } from '@/domain/ICategoryCollection';
 import { CategoryCollection } from '@/domain/CategoryCollection';
 import { IProjectInformation } from '@/domain/IProjectInformation';
+import { createEnumParser } from '../Common/Enum';
+import { parseCategory } from './CategoryParser';
 import { CategoryCollectionParseContext } from './Script/CategoryCollectionParseContext';
 import { ScriptingDefinitionParser } from './ScriptingDefinition/ScriptingDefinitionParser';
 
 export function parseCategoryCollection(
   content: CollectionData,
   info: IProjectInformation,
-    osParser = createEnumParser(OperatingSystem)): ICategoryCollection {
+  osParser = createEnumParser(OperatingSystem),
+): ICategoryCollection {
   validate(content);
   const scripting = new ScriptingDefinitionParser()
     .parse(content.scripting, info);
   const context = new CategoryCollectionParseContext(content.functions, scripting);
-    const categories = new Array<Category>();
+  const categories = content.actions.map((action) => parseCategory(action, context));
-    for (const action of content.actions) {
-        const category = parseCategory(action, context);
-        categories.push(category);
-    }
   const os = osParser.parseEnum(content.os, 'os');
   const collection = new CategoryCollection(
     os,
     categories,
-        scripting);
+    scripting,
+  );
   return collection;
 }
 

src/application/Parser/CategoryParser.ts

@@ -1,18 +1,18 @@
-import { CategoryData, ScriptData, CategoryOrScriptData } from 'js-yaml-loader!@/*';
+import {
+  CategoryData, ScriptData, CategoryOrScriptData, InstructionHolder,
+} from 'js-yaml-loader!@/*';
 import { Script } from '@/domain/Script';
 import { Category } from '@/domain/Category';
 import { parseDocUrls } from './DocumentationParser';
 import { ICategoryCollectionParseContext } from './Script/ICategoryCollectionParseContext';
 import { parseScript } from './Script/ScriptParser';
 
-let categoryIdCounter: number = 0;
+let categoryIdCounter = 0;
 
-interface ICategoryChildren {
+export function parseCategory(
-    subCategories: Category[];
+  category: CategoryData,
-    subScripts: Script[];
+  context: ICategoryCollectionParseContext,
-}
+): Category {
-
-export function parseCategory(category: CategoryData, context: ICategoryCollectionParseContext): Category {
   if (!context) { throw new Error('undefined context'); }
   ensureValid(category);
   const children: ICategoryChildren = {
@@ -23,11 +23,11 @@ export function parseCategory(category: CategoryData, context: ICategoryCollecti
     parseCategoryChild(data, children, category, context);
   }
   return new Category(
-        /*id*/ categoryIdCounter++,
+    /* id: */ categoryIdCounter++,
-        /*name*/ category.category,
+    /* name: */ category.category,
-        /*docs*/ parseDocUrls(category),
+    /* docs: */ parseDocUrls(category),
-        /*categories*/ children.subCategories,
+    /* categories: */ children.subCategories,
-        /*scripts*/ children.subScripts,
+    /* scripts: */ children.subScripts,
   );
 }
 
@@ -43,11 +43,17 @@ function ensureValid(category: CategoryData) {
   }
 }
 
+interface ICategoryChildren {
+  subCategories: Category[];
+  subScripts: Script[];
+}
+
 function parseCategoryChild(
   data: CategoryOrScriptData,
   children: ICategoryChildren,
   parent: CategoryData,
-    context: ICategoryCollectionParseContext) {
+  context: ICategoryCollectionParseContext,
+) {
   if (isCategory(data)) {
     const subCategory = parseCategory(data as CategoryData, context);
     children.subCategories.push(subCategory);
@@ -61,11 +67,20 @@ function parseCategoryChild(
   }
 }
 
-function isScript(data: any): boolean {
+function isScript(data: CategoryOrScriptData): data is ScriptData {
-    return (data.code && data.code.length > 0)
+  const holder = (data as InstructionHolder);
-        || data.call;
+  return hasCode(holder) || hasCall(holder);
 }
 
-function isCategory(data: any): boolean {
+function isCategory(data: CategoryOrScriptData): data is CategoryData {
-    return data.category && data.category.length > 0;
+  const { category } = data as CategoryData;
+  return category && category.length > 0;
+}
+
+function hasCode(holder: InstructionHolder): boolean {
+  return holder.code && holder.code.length > 0;
+}
+
+function hasCall(holder: InstructionHolder) {
+  return holder.call !== undefined;
 }

src/application/Parser/DocumentationParser.ts

@@ -4,7 +4,7 @@ export function parseDocUrls(documentable: DocumentableData): ReadonlyArray<stri
   if (!documentable) {
     throw new Error('documentable is null or undefined');
   }
-    const docs = documentable.docs;
+  const { docs } = documentable;
   if (!docs || !docs.length) {
     return [];
   }
@@ -13,7 +13,10 @@ export function parseDocUrls(documentable: DocumentableData): ReadonlyArray<stri
   return result.getAll();
 }
 
-function addDocs(docs: DocumentationUrlsData, urls: DocumentationUrlContainer): DocumentationUrlContainer {
+function addDocs(
+  docs: DocumentationUrlsData,
+  urls: DocumentationUrlContainer,
+): DocumentationUrlContainer {
   if (docs instanceof Array) {
     urls.addUrls(docs);
   } else if (typeof docs === 'string') {
@@ -32,7 +35,7 @@ class DocumentationUrlContainer {
     this.urls.push(url);
   }
 
-    public addUrls(urls: readonly any[]) {
+  public addUrls(urls: readonly string[]) {
     for (const url of urls) {
       if (typeof url !== 'string') {
         throw new Error('Docs field (documentation url) must be an array of strings');
@@ -53,8 +56,8 @@ function validateUrl(docUrl: string): void {
   if (docUrl.includes('\n')) {
     throw new Error('Documentation url cannot be multi-lined.');
   }
-    const res = docUrl.match(
+  const validUrlRegex = /(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_+.~#?&//=]*)/g;
-        /(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/g);
+  const res = docUrl.match(validUrlRegex);
   if (res == null) {
     throw new Error(`Invalid documentation url: ${docUrl}`);
   }

src/application/Parser/ProjectInformationParser.ts

@@ -2,7 +2,8 @@ import { IProjectInformation } from '@/domain/IProjectInformation';
 import { ProjectInformation } from '@/domain/ProjectInformation';
 
 export function parseProjectInformation(
-    environment: NodeJS.ProcessEnv): IProjectInformation {
+  environment: NodeJS.ProcessEnv,
+): IProjectInformation {
   return new ProjectInformation(
     environment.VUE_APP_NAME,
     environment.VUE_APP_VERSION,

src/application/Parser/Script/CategoryCollectionParseContext.ts

@@ -1,6 +1,6 @@
+import { FunctionData } from 'js-yaml-loader!@/*';
 import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
 import { ILanguageSyntax } from '@/domain/ScriptCode';
-import { FunctionData } from 'js-yaml-loader!@/*';
 import { IScriptCompiler } from './Compiler/IScriptCompiler';
 import { ScriptCompiler } from './Compiler/ScriptCompiler';
 import { ICategoryCollectionParseContext } from './ICategoryCollectionParseContext';
@@ -9,12 +9,14 @@ import { ISyntaxFactory } from './Syntax/ISyntaxFactory';
 
 export class CategoryCollectionParseContext implements ICategoryCollectionParseContext {
   public readonly compiler: IScriptCompiler;
+
   public readonly syntax: ILanguageSyntax;
 
   constructor(
     functionsData: ReadonlyArray<FunctionData> | undefined,
     scripting: IScriptingDefinition,
-        syntaxFactory: ISyntaxFactory = new SyntaxFactory()) {
+    syntaxFactory: ISyntaxFactory = new SyntaxFactory(),
+  ) {
     if (!scripting) { throw new Error('undefined scripting'); }
     this.syntax = syntaxFactory.create(scripting.language);
     this.compiler = new ScriptCompiler(functionsData, this.syntax);

src/application/Parser/Script/Compiler/Expressions/Expression/Expression.ts

@@ -1,18 +1,19 @@
-import { ExpressionPosition } from './ExpressionPosition';
+import { FunctionParameterCollection } from '@/application/Parser/Script/Compiler/Function/Parameter/FunctionParameterCollection';
-import { IExpression } from './IExpression';
 import { IReadOnlyFunctionCallArgumentCollection } from '../../Function/Call/Argument/IFunctionCallArgumentCollection';
 import { IReadOnlyFunctionParameterCollection } from '../../Function/Parameter/IFunctionParameterCollection';
-import { FunctionParameterCollection } from '@/application/Parser/Script/Compiler/Function/Parameter/FunctionParameterCollection';
 import { FunctionCallArgumentCollection } from '../../Function/Call/Argument/FunctionCallArgumentCollection';
-import { IExpressionEvaluationContext } from './ExpressionEvaluationContext';
+import { IExpression } from './IExpression';
-import { ExpressionEvaluationContext } from '@/application/Parser/Script/Compiler/Expressions/Expression/ExpressionEvaluationContext';
+import { ExpressionPosition } from './ExpressionPosition';
+import { ExpressionEvaluationContext, IExpressionEvaluationContext } from './ExpressionEvaluationContext';
 
 export type ExpressionEvaluator = (context: IExpressionEvaluationContext) => string;
 export class Expression implements IExpression {
   constructor(
     public readonly position: ExpressionPosition,
     public readonly evaluator: ExpressionEvaluator,
-        public readonly parameters: IReadOnlyFunctionParameterCollection = new FunctionParameterCollection()) {
+    public readonly parameters
+      : IReadOnlyFunctionParameterCollection = new FunctionParameterCollection(),
+  ) {
     if (!position) {
       throw new Error('undefined position');
     }
@@ -20,14 +21,15 @@ export class Expression implements IExpression {
       throw new Error('undefined evaluator');
     }
   }
+
   public evaluate(context: IExpressionEvaluationContext): string {
     if (!context) {
       throw new Error('undefined context');
     }
     validateThatAllRequiredParametersAreSatisfied(this.parameters, context.args);
     const args = filterUnusedArguments(this.parameters, context.args);
-        context = new ExpressionEvaluationContext(args, context.pipelineCompiler);
+    const filteredContext = new ExpressionEvaluationContext(args, context.pipelineCompiler);
-        return this.evaluator(context);
+    return this.evaluator(filteredContext);
   }
 }
 
@@ -43,20 +45,19 @@ function validateThatAllRequiredParametersAreSatisfied(
     .filter((parameterName) => !args.hasArgument(parameterName));
   if (missingParameterNames.length) {
     throw new Error(
-            `argument values are provided for required parameters: "${missingParameterNames.join('", "')}"`);
+      `argument values are provided for required parameters: "${missingParameterNames.join('", "')}"`,
+    );
   }
 }
 
 function filterUnusedArguments(
   parameters: IReadOnlyFunctionParameterCollection,
-    allFunctionArgs: IReadOnlyFunctionCallArgumentCollection): IReadOnlyFunctionCallArgumentCollection {
+  allFunctionArgs: IReadOnlyFunctionCallArgumentCollection,
+): IReadOnlyFunctionCallArgumentCollection {
   const specificCallArgs = new FunctionCallArgumentCollection();
-    for (const parameter of parameters.all) {
+  parameters.all
-        if (parameter.isOptional && !allFunctionArgs.hasArgument(parameter.name)) {
+    .filter((parameter) => allFunctionArgs.hasArgument(parameter.name))
-            continue; // Optional parameter is not necessarily provided
+    .map((parameter) => allFunctionArgs.getArgument(parameter.name))
-        }
+    .forEach((argument) => specificCallArgs.addArgument(argument));
-        const arg = allFunctionArgs.getArgument(parameter.name);
-        specificCallArgs.addArgument(arg);
-    }
   return specificCallArgs;
 }

src/application/Parser/Script/Compiler/Expressions/Expression/ExpressionEvaluationContext.ts

@@ -10,7 +10,8 @@ export interface IExpressionEvaluationContext {
 export class ExpressionEvaluationContext implements IExpressionEvaluationContext {
   constructor(
     public readonly args: IReadOnlyFunctionCallArgumentCollection,
-        public readonly pipelineCompiler: IPipelineCompiler = new PipelineCompiler()) {
+    public readonly pipelineCompiler: IPipelineCompiler = new PipelineCompiler(),
+  ) {
     if (!args) {
       throw new Error('undefined args, send empty collection instead');
     }

src/application/Parser/Script/Compiler/Expressions/Expression/ExpressionPosition.ts

@@ -1,7 +1,8 @@
 export class ExpressionPosition {
   constructor(
     public readonly start: number,
-        public readonly end: number) {
+    public readonly end: number,
+  ) {
     if (start === end) {
       throw new Error(`no length (start = end = ${start})`);
     }

src/application/Parser/Script/Compiler/Expressions/Expression/IExpression.ts

@@ -1,5 +1,5 @@
-import { ExpressionPosition } from './ExpressionPosition';
 import { IReadOnlyFunctionParameterCollection } from '../../Function/Parameter/IFunctionParameterCollection';
+import { ExpressionPosition } from './ExpressionPosition';
 import { IExpressionEvaluationContext } from './ExpressionEvaluationContext';
 
 export interface IExpression {

src/application/Parser/Script/Compiler/Expressions/ExpressionsCompiler.ts

@@ -1,20 +1,25 @@
+import { IExpressionEvaluationContext, ExpressionEvaluationContext } from '@/application/Parser/Script/Compiler/Expressions/Expression/ExpressionEvaluationContext';
+import { IReadOnlyFunctionCallArgumentCollection } from '../Function/Call/Argument/IFunctionCallArgumentCollection';
 import { IExpressionsCompiler } from './IExpressionsCompiler';
 import { IExpression } from './Expression/IExpression';
 import { IExpressionParser } from './Parser/IExpressionParser';
 import { CompositeExpressionParser } from './Parser/CompositeExpressionParser';
-import { IReadOnlyFunctionCallArgumentCollection } from '../Function/Call/Argument/IFunctionCallArgumentCollection';
-import { ExpressionEvaluationContext } from './Expression/ExpressionEvaluationContext';
-import { IExpressionEvaluationContext } from '@/application/Parser/Script/Compiler/Expressions/Expression/ExpressionEvaluationContext';
 
 export class ExpressionsCompiler implements IExpressionsCompiler {
   public constructor(
-        private readonly extractor: IExpressionParser = new CompositeExpressionParser()) { }
+    private readonly extractor: IExpressionParser = new CompositeExpressionParser(),
+  ) { }
+
   public compileExpressions(
-        code: string,
+    code: string | undefined,
-        args: IReadOnlyFunctionCallArgumentCollection): string {
+    args: IReadOnlyFunctionCallArgumentCollection,
+  ): string {
     if (!args) {
       throw new Error('undefined args, send empty collection instead');
     }
+    if (!code) {
+      return code;
+    }
     const expressions = this.extractor.findExpressions(code);
     ensureParamsUsedInCodeHasArgsProvided(expressions, args);
     const context = new ExpressionEvaluationContext(args);
@@ -26,7 +31,8 @@ export class ExpressionsCompiler implements IExpressionsCompiler {
 function compileExpressions(
   expressions: readonly IExpression[],
   code: string,
-    context: IExpressionEvaluationContext) {
+  context: IExpressionEvaluationContext,
+) {
   let compiledCode = '';
   const sortedExpressions = expressions
     .slice() // copy the array to not mutate the parameter
@@ -48,20 +54,21 @@ function compileExpressions(
 }
 
 function extractRequiredParameterNames(
-    expressions: readonly IExpression[]): string[] {
+  expressions: readonly IExpression[],
-    const usedParameterNames = expressions
+): string[] {
+  return expressions
     .map((e) => e.parameters.all
       .filter((p) => !p.isOptional)
       .map((p) => p.name))
-        .filter((p) => p)
+    .filter(Boolean) // Remove empty or undefined
-        .flat();
+    .flat()
-    const uniqueParameterNames = Array.from(new Set(usedParameterNames));
+    .filter((name, index, array) => array.indexOf(name) === index); // Remove duplicates
-    return uniqueParameterNames;
 }
 
 function ensureParamsUsedInCodeHasArgsProvided(
   expressions: readonly IExpression[],
-    providedArgs: IReadOnlyFunctionCallArgumentCollection): void {
+  providedArgs: IReadOnlyFunctionCallArgumentCollection,
+): void {
   const usedParameterNames = extractRequiredParameterNames(expressions);
   if (!usedParameterNames?.length) {
     return;

src/application/Parser/Script/Compiler/Expressions/IExpressionsCompiler.ts

@@ -2,6 +2,6 @@ import { IReadOnlyFunctionCallArgumentCollection } from '../Function/Call/Argume
 
 export interface IExpressionsCompiler {
   compileExpressions(
-        code: string,
+    code: string | undefined,
     args: IReadOnlyFunctionCallArgumentCollection): string;
 }

src/application/Parser/Script/Compiler/Expressions/Parser/CompositeExpressionParser.ts

@@ -1,7 +1,7 @@
 import { IExpression } from '../Expression/IExpression';
-import { IExpressionParser } from './IExpressionParser';
 import { ParameterSubstitutionParser } from '../SyntaxParsers/ParameterSubstitutionParser';
 import { WithParser } from '../SyntaxParsers/WithParser';
+import { IExpressionParser } from './IExpressionParser';
 
 const Parsers = [
   new ParameterSubstitutionParser(),
@@ -14,14 +14,10 @@ export class CompositeExpressionParser implements IExpressionParser {
       throw new Error('undefined leaf');
     }
   }
+
   public findExpressions(code: string): IExpression[] {
-        const expressions = new Array<IExpression>();
+    return this.leafs.flatMap(
-        for (const parser of this.leafs) {
+      (parser) => parser.findExpressions(code) || [],
-            const newExpressions = parser.findExpressions(code);
+    );
-            if (newExpressions && newExpressions.length) {
-                expressions.push(...newExpressions);
-            }
-        }
-        return expressions;
   }
 }

src/application/Parser/Script/Compiler/Expressions/Parser/Regex/ExpressionRegexBuilder.ts

@@ -52,6 +52,7 @@ export class ExpressionRegexBuilder {
     return this
       .addRawRegex('\\s*');
   }
+
   private addRawRegex(regex: string) {
     this.parts.push(regex);
     return this;

src/application/Parser/Script/Compiler/Expressions/Parser/Regex/RegexParser.ts

@@ -15,34 +15,45 @@ export abstract class RegexParser implements IExpressionParser {
   protected abstract buildExpression(match: RegExpMatchArray): IPrimitiveExpression;
 
   private* findRegexExpressions(code: string): Iterable<IExpression> {
-        const matches = Array.from(code.matchAll(this.regex));
+    if (!code) {
-        for (const match of matches) {
+      throw new Error('undefined code');
-            const startPos = match.index;
-            const endPos = startPos + match[0].length;
-            let position: ExpressionPosition;
-            try {
-                position = new ExpressionPosition(startPos, endPos);
-            } catch (error) {
-                throw new Error(`[${this.constructor.name}] invalid script position: ${error.message}\nRegex ${this.regex}\nCode: ${code}`);
     }
+    const matches = code.matchAll(this.regex);
+    for (const match of matches) {
       const primitiveExpression = this.buildExpression(match);
-            const parameters = getParameters(primitiveExpression);
+      const position = this.doOrRethrow(() => createPosition(match), 'invalid script position', code);
+      const parameters = createParameters(primitiveExpression);
       const expression = new Expression(position, primitiveExpression.evaluator, parameters);
       yield expression;
     }
   }
+
+  private doOrRethrow<T>(action: () => T, errorText: string, code: string): T {
+    try {
+      return action();
+    } catch (error) {
+      throw new Error(`[${this.constructor.name}] ${errorText}: ${error.message}\nRegex: ${this.regex}\nCode: ${code}`);
+    }
+  }
+}
+
+function createPosition(match: RegExpMatchArray): ExpressionPosition {
+  const startPos = match.index;
+  const endPos = startPos + match[0].length;
+  return new ExpressionPosition(startPos, endPos);
+}
+
+function createParameters(
+  expression: IPrimitiveExpression,
+): FunctionParameterCollection {
+  return (expression.parameters || [])
+    .reduce((parameters, parameter) => {
+      parameters.addParameter(parameter);
+      return parameters;
+    }, new FunctionParameterCollection());
 }
 
 export interface IPrimitiveExpression {
   evaluator: ExpressionEvaluator;
   parameters?: readonly IFunctionParameter[];
 }
-
-function getParameters(
-    expression: IPrimitiveExpression): FunctionParameterCollection {
-    const parameters  = new FunctionParameterCollection();
-    for (const parameter of expression.parameters || []) {
-        parameters.addParameter(parameter);
-    }
-    return parameters;
-}

src/application/Parser/Script/Compiler/Expressions/Pipes/PipeDefinitions/EscapeDoubleQuotes.ts

@@ -2,8 +2,10 @@ import { IPipe } from '../IPipe';
 
 export class EscapeDoubleQuotes implements IPipe {
   public readonly name: string = 'escapeDoubleQuotes';
+
   public apply(raw: string): string {
     return raw?.replaceAll('"', '"^""');
+    /* eslint-disable max-len */
     /*
       "^"" is the most robust and stable choice.
       Other options:
@@ -11,17 +13,18 @@ export class EscapeDoubleQuotes implements IPipe {
           Breaks, because it is fundamentally unsupported
         """"
           Does not work with consecutive double quotes.
-                    E.g. PowerShell -Command "$name='aq'; Write-Host """"Disabled `""""$name`"""""""";"
+          E.g. `PowerShell -Command "$name='aq'; Write-Host """"Disabled `""""$name`"""""""";"`
-                    Works when using: PowerShell -Command "$name='aq'; Write-Host "^""Disabled `"^""$name`"^"" "^"";"
+          Works when using: `PowerShell -Command "$name='aq'; Write-Host "^""Disabled `"^""$name`"^"" "^"";"`
         \"
           May break as they are interpreted by cmd.exe as metacharacters breaking the command
-                    E.g. PowerShell -Command "Write-Host 'Hello \"w&orld\"'" does not work due to unescaped "&"
+          E.g. `PowerShell -Command "Write-Host 'Hello \"w&orld\"'"` does not work due to unescaped "&"
-                    Works when using: PowerShell -Command "Write-Host 'Hello "^""w&orld"^""'"
+          Works when using: `PowerShell -Command "Write-Host 'Hello "^""w&orld"^""'"`
         \""
           Normalizes interior whitespace
-                    E.g. PowerShell -Command "\""a&  c\"".length", outputs 4 and discards one of two whitespaces
+          E.g. `PowerShell -Command "\""a&  c\"".length"`, outputs 4 and discards one of two whitespaces
-                    Works when using "^"": PowerShell -Command ""^""a&  c"^"".length"
+          Works when using "^"": `PowerShell -Command ""^""a&  c"^"".length"`
       A good explanation: https://stackoverflow.com/a/31413730
     */
+    /* eslint-enable max-len */
   }
 }

src/application/Parser/Script/Compiler/Expressions/Pipes/PipeDefinitions/InlinePowerShell.ts

@@ -2,18 +2,19 @@ import { IPipe } from '../IPipe';
 
 export class InlinePowerShell implements IPipe {
   public readonly name: string = 'inlinePowerShell';
+
   public apply(code: string): string {
     if (!code || !hasLines(code)) {
       return code;
     }
-        code = inlineComments(code);
+    const processor = new Array<(data: string) => string>(...[ // for broken ESlint "indent"
-        code = mergeLinesWithBacktick(code);
+      inlineComments,
-        code = mergeHereStrings(code);
+      mergeLinesWithBacktick,
-        const lines = getLines(code)
+      mergeHereStrings,
-            .map((line) => line.trim())
+      mergeNewLines,
-            .filter((line) => line.length > 0);
+    ]).reduce((a, b) => (data) => b(a(data)));
-        return lines
+    const newCode = processor(code);
-            .join('; ');
+    return newCode;
   }
 }
 
@@ -112,15 +113,18 @@ interface IInlinedHereString {
   readonly escapedQuotes: string;
   readonly separator: string;
 }
-// We handle @' and @" differently so single quotes are interpreted literally and doubles are expandable
 function getHereStringHandler(quotes: string): IInlinedHereString {
+  /*
+    We handle @' and @" differently.
+    Single quotes are interpreted literally and doubles are expandable.
+  */
   const expandableNewLine = '`r`n';
   switch (quotes) {
     case '\'':
       return {
         quotesAround: '\'',
         escapedQuotes: '\'\'',
-                separator: `\'+"${expandableNewLine}"+\'`,
+        separator: `'+"${expandableNewLine}"+'`,
       };
     case '"':
       return {
@@ -153,3 +157,10 @@ function mergeLinesWithBacktick(code: string) {
   */
   return code.replaceAll(/ +`\s*(?:\r\n|\r|\n)\s*/g, ' ');
 }
+
+function mergeNewLines(code: string) {
+  return getLines(code)
+    .map((line) => line.trim())
+    .filter((line) => line.length > 0)
+    .join('; ');
+}

src/application/Parser/Script/Compiler/Expressions/Pipes/PipeFactory.ts

@@ -13,6 +13,7 @@ export interface IPipeFactory {
 
 export class PipeFactory implements IPipeFactory {
   private readonly pipes = new Map<string, IPipe>();
+
   constructor(pipes: readonly IPipe[] = RegisteredPipes) {
     if (pipes.some((pipe) => !pipe)) {
       throw new Error('undefined pipe in list');
@@ -21,6 +22,7 @@ export class PipeFactory implements IPipeFactory {
       this.registerPipe(pipe);
     }
   }
+
   public get(pipeName: string): IPipe {
     validatePipeName(pipeName);
     if (!this.pipes.has(pipeName)) {
@@ -28,6 +30,7 @@ export class PipeFactory implements IPipeFactory {
     }
     return this.pipes.get(pipeName);
   }
+
   private registerPipe(pipe: IPipe): void {
     validatePipeName(pipe.name);
     if (this.pipes.has(pipe.name)) {

src/application/Parser/Script/Compiler/Expressions/Pipes/PipelineCompiler.ts

@@ -3,14 +3,14 @@ import { IPipelineCompiler } from './IPipelineCompiler';
 
 export class PipelineCompiler implements IPipelineCompiler {
   constructor(private readonly factory: IPipeFactory = new PipeFactory()) { }
+
   public compile(value: string, pipeline: string): string {
     ensureValidArguments(value, pipeline);
     const pipeNames = extractPipeNames(pipeline);
     const pipes = pipeNames.map((pipeName) => this.factory.get(pipeName));
-        for (const pipe of pipes) {
+    return pipes.reduce((previousValue, pipe) => {
-            value = pipe.apply(value);
+      return pipe.apply(previousValue);
-        }
+    }, value);
-        return value;
   }
 }
 

src/application/Parser/Script/Compiler/Expressions/SyntaxParsers/ParameterSubstitutionParser.ts

@@ -1,5 +1,5 @@
-import { RegexParser, IPrimitiveExpression } from '../Parser/Regex/RegexParser';
 import { FunctionParameter } from '@/application/Parser/Script/Compiler/Function/Parameter/FunctionParameter';
+import { RegexParser, IPrimitiveExpression } from '../Parser/Regex/RegexParser';
 import { ExpressionRegexBuilder } from '../Parser/Regex/ExpressionRegexBuilder';
 
 export class ParameterSubstitutionParser extends RegexParser {
@@ -17,7 +17,7 @@ export class ParameterSubstitutionParser extends RegexParser {
     return {
       parameters: [new FunctionParameter(parameterName, false)],
       evaluator: (context) => {
-                const argumentValue = context.args.getArgument(parameterName).argumentValue;
+        const { argumentValue } = context.args.getArgument(parameterName);
         if (!pipeline) {
           return argumentValue;
         }

src/application/Parser/Script/Compiler/Expressions/SyntaxParsers/WithParser.ts

@@ -1,5 +1,5 @@
-import { RegexParser, IPrimitiveExpression } from '../Parser/Regex/RegexParser';
 import { FunctionParameter } from '@/application/Parser/Script/Compiler/Function/Parameter/FunctionParameter';
+import { RegexParser, IPrimitiveExpression } from '../Parser/Regex/RegexParser';
 import { ExpressionRegexBuilder } from '../Parser/Regex/ExpressionRegexBuilder';
 
 export class WithParser extends RegexParser {
@@ -25,8 +25,8 @@ export class WithParser extends RegexParser {
     return {
       parameters: [new FunctionParameter(parameterName, true)],
       evaluator: (context) => {
-                const argumentValue = context.args.hasArgument(parameterName) ?
+        const argumentValue = context.args.hasArgument(parameterName)
-                    context.args.getArgument(parameterName).argumentValue
+          ? context.args.getArgument(parameterName).argumentValue
           : undefined;
         if (!argumentValue) {
           return '';
@@ -51,7 +51,8 @@ const ScopeSubstitutionRegEx = new ExpressionRegexBuilder()
   .buildRegExp();
 
 function replaceEachScopeSubstitution(scopeText: string, replacer: (pipeline: string) => string) {
-    // Not using /{{\s*.\s*(?:(\|\s*[^{}]*?)\s*)?}}/g for not matching brackets, but let pipeline compiler fail on those
+  // Not using /{{\s*.\s*(?:(\|\s*[^{}]*?)\s*)?}}/g for not matching brackets,
+  // but instead letting the pipeline compiler to fail on those.
   return scopeText.replaceAll(ScopeSubstitutionRegEx, (_$, match1) => {
     return replacer(match1);
   });

src/application/Parser/Script/Compiler/Function/Call/Argument/FunctionCallArgument.ts

@@ -1,10 +1,11 @@
-import { IFunctionCallArgument } from './IFunctionCallArgument';
 import { ensureValidParameterName } from '../../Shared/ParameterNameValidator';
+import { IFunctionCallArgument } from './IFunctionCallArgument';
 
 export class FunctionCallArgument implements IFunctionCallArgument {
   constructor(
     public readonly parameterName: string,
-        public readonly argumentValue: string) {
+    public readonly argumentValue: string,
+  ) {
     ensureValidParameterName(parameterName);
     if (!argumentValue) {
       throw new Error(`undefined argument value for "${parameterName}"`);

src/application/Parser/Script/Compiler/Function/Call/Argument/FunctionCallArgumentCollection.ts

@@ -3,6 +3,7 @@ import { IFunctionCallArgumentCollection } from './IFunctionCallArgumentCollecti
 
 export class FunctionCallArgumentCollection implements IFunctionCallArgumentCollection {
   private readonly arguments = new Map<string, IFunctionCallArgument>();
+
   public addArgument(argument: IFunctionCallArgument): void {
     if (!argument) {
       throw new Error('undefined argument');
@@ -12,15 +13,18 @@ export class FunctionCallArgumentCollection implements IFunctionCallArgumentColl
     }
     this.arguments.set(argument.parameterName, argument);
   }
+
   public getAllParameterNames(): string[] {
     return Array.from(this.arguments.keys());
   }
+
   public hasArgument(parameterName: string): boolean {
     if (!parameterName) {
       throw new Error('undefined parameter name');
     }
     return this.arguments.has(parameterName);
   }
+
   public getArgument(parameterName: string): IFunctionCallArgument {
     if (!parameterName) {
       throw new Error('undefined parameter name');

src/application/Parser/Script/Compiler/Function/Call/Compiler/FunctionCallCompiler.ts

@@ -1,25 +1,27 @@
 import { IReadOnlyFunctionCallArgumentCollection } from '@/application/Parser/Script/Compiler/Function/Call/Argument/IFunctionCallArgumentCollection';
-import { ICompiledCode } from './ICompiledCode';
+import { IFunctionCall } from '@/application/Parser/Script/Compiler/Function/Call/IFunctionCall';
+import { FunctionCallArgument } from '@/application/Parser/Script/Compiler/Function/Call/Argument/FunctionCallArgument';
 import { ISharedFunctionCollection } from '../../ISharedFunctionCollection';
-import { IFunctionCallCompiler } from './IFunctionCallCompiler';
 import { IExpressionsCompiler } from '../../../Expressions/IExpressionsCompiler';
 import { ExpressionsCompiler } from '../../../Expressions/ExpressionsCompiler';
 import { ISharedFunction, IFunctionCode } from '../../ISharedFunction';
-import { IFunctionCall } from '@/application/Parser/Script/Compiler/Function/Call/IFunctionCall';
 import { FunctionCall } from '../FunctionCall';
 import { FunctionCallArgumentCollection } from '../Argument/FunctionCallArgumentCollection';
-import { FunctionCallArgument } from '@/application/Parser/Script/Compiler/Function/Call/Argument/FunctionCallArgument';
+import { IFunctionCallCompiler } from './IFunctionCallCompiler';
+import { ICompiledCode } from './ICompiledCode';
 
 export class FunctionCallCompiler implements IFunctionCallCompiler {
   public static readonly instance: IFunctionCallCompiler = new FunctionCallCompiler();
 
   protected constructor(
-        private readonly expressionsCompiler: IExpressionsCompiler = new ExpressionsCompiler()) {
+    private readonly expressionsCompiler: IExpressionsCompiler = new ExpressionsCompiler(),
+  ) {
   }
 
   public compileCall(
     calls: IFunctionCall[],
-        functions: ISharedFunctionCollection): ICompiledCode {
+    functions: ISharedFunctionCollection,
+  ): ICompiledCode {
     if (!functions) { throw new Error('undefined functions'); }
     if (!calls) { throw new Error('undefined calls'); }
     if (calls.some((f) => !f)) { throw new Error('undefined function call'); }
@@ -45,24 +47,25 @@ interface ICompiledFunctionCall {
 }
 
 function compileCallSequence(context: ICompilationContext): ICompiledFunctionCall {
-    const compiledFunctions = new Array<ICompiledFunctionCall>();
+  const compiledFunctions = context.callSequence
-    for (const call of context.callSequence) {
+    .flatMap((call) => compileSingleCall(call, context));
-        const compiledCode = compileSingleCall(call, context);
-        compiledFunctions.push(...compiledCode);
-    }
   return {
     code: merge(compiledFunctions.map((f) => f.code)),
     revertCode: merge(compiledFunctions.map((f) => f.revertCode)),
   };
 }
 
-function compileSingleCall(call: IFunctionCall, context: ICompilationContext): ICompiledFunctionCall[] {
+function compileSingleCall(
+  call: IFunctionCall,
+  context: ICompilationContext,
+): ICompiledFunctionCall[] {
   const func = context.allFunctions.getFunctionByName(call.functionName);
   ensureThatCallArgumentsExistInParameterDefinition(func, call.args);
   if (func.body.code) { // Function with inline code
     const compiledCode = compileCode(func.body.code, call.args, context.expressionsCompiler);
     return [compiledCode];
-    } else { // Function with inner calls
+  }
+  // Function with inner calls
   return func.body.calls
     .map((innerCall) => {
       const compiledArgs = compileArgs(innerCall.args, call.args, context.expressionsCompiler);
@@ -71,12 +74,12 @@ function compileSingleCall(call: IFunctionCall, context: ICompilationContext): I
     })
     .flat();
 }
-}
 
 function compileCode(
   code: IFunctionCode,
   args: IReadOnlyFunctionCallArgumentCollection,
-    compiler: IExpressionsCompiler): ICompiledFunctionCall {
+  compiler: IExpressionsCompiler,
+): ICompiledFunctionCall {
   return {
     code: compiler.compileExpressions(code.do, args),
     revertCode: compiler.compileExpressions(code.revert, args),
@@ -88,14 +91,17 @@ function compileArgs(
   args: IReadOnlyFunctionCallArgumentCollection,
   compiler: IExpressionsCompiler,
 ): IReadOnlyFunctionCallArgumentCollection {
-    const compiledArgs = new FunctionCallArgumentCollection();
+  return argsToCompile
-    for (const parameterName of argsToCompile.getAllParameterNames()) {
+    .getAllParameterNames()
-        const argumentValue = argsToCompile.getArgument(parameterName).argumentValue;
+    .map((parameterName) => {
+      const { argumentValue } = argsToCompile.getArgument(parameterName);
       const compiledValue = compiler.compileExpressions(argumentValue, args);
-        const newArgument = new FunctionCallArgument(parameterName, compiledValue);
+      return new FunctionCallArgument(parameterName, compiledValue);
-        compiledArgs.addArgument(newArgument);
+    })
-    }
+    .reduce((compiledArgs, arg) => {
+      compiledArgs.addArgument(arg);
       return compiledArgs;
+    }, new FunctionCallArgumentCollection());
 }
 
 function merge(codeParts: readonly string[]): string {
@@ -106,7 +112,8 @@ function merge(codeParts: readonly string[]): string {
 
 function ensureThatCallArgumentsExistInParameterDefinition(
   func: ISharedFunction,
-    args: IReadOnlyFunctionCallArgumentCollection): void {
+  args: IReadOnlyFunctionCallArgumentCollection,
+): void {
   const callArgumentNames = args.getAllParameterNames();
   const functionParameterNames = func.parameters.all.map((param) => param.name) || [];
   const unexpectedParameters = findUnexpectedParameters(callArgumentNames, functionParameterNames);
@@ -115,7 +122,8 @@ function ensureThatCallArgumentsExistInParameterDefinition(
 
 function findUnexpectedParameters(
   callArgumentNames: string[],
-    functionParameterNames: string[]): string[] {
+  functionParameterNames: string[],
+): string[] {
   if (!callArgumentNames.length && !functionParameterNames.length) {
     return [];
   }
@@ -126,14 +134,16 @@ function findUnexpectedParameters(
 function throwIfNotEmpty(
   functionName: string,
   unexpectedParameters: string[],
-    expectedParameters: string[]) {
+  expectedParameters: string[],
+) {
   if (!unexpectedParameters.length) {
     return;
   }
   throw new Error(
-        `Function "${functionName}" has unexpected parameter(s) provided: ` +
+    // eslint-disable-next-line prefer-template
-        `"${unexpectedParameters.join('", "')}"` +
+    `Function "${functionName}" has unexpected parameter(s) provided: `
-        '. Expected parameter(s): ' +
+      + `"${unexpectedParameters.join('", "')}"`
-        (expectedParameters.length ? `"${expectedParameters.join('", "')}"` : 'none'),
+      + '. Expected parameter(s): '
+      + (expectedParameters.length ? `"${expectedParameters.join('", "')}"` : 'none'),
   );
 }

src/application/Parser/Script/Compiler/Function/Call/Compiler/IFunctionCallCompiler.ts

@@ -1,6 +1,6 @@
-import { ICompiledCode } from './ICompiledCode';
 import { ISharedFunctionCollection } from '@/application/Parser/Script/Compiler/Function/ISharedFunctionCollection';
 import { IFunctionCall } from '../IFunctionCall';
+import { ICompiledCode } from './ICompiledCode';
 
 export interface IFunctionCallCompiler {
   compileCall(

src/application/Parser/Script/Compiler/Function/Call/FunctionCall.ts

@@ -4,7 +4,8 @@ import { IFunctionCall } from './IFunctionCall';
 export class FunctionCall implements IFunctionCall {
   constructor(
     public readonly functionName: string,
-        public readonly args: IReadOnlyFunctionCallArgumentCollection) {
+    public readonly args: IReadOnlyFunctionCallArgumentCollection,
+  ) {
     if (!functionName) {
       throw new Error('empty function name in function call');
     }

src/application/Parser/Script/Compiler/Function/Call/FunctionCallParser.ts

@@ -1,11 +1,11 @@
-import { FunctionCallData, FunctionCallsData } from 'js-yaml-loader!@/*';
+import { FunctionCallData, FunctionCallsData, FunctionCallParametersData } from 'js-yaml-loader!@/*';
 import { IFunctionCall } from './IFunctionCall';
 import { FunctionCallArgumentCollection } from './Argument/FunctionCallArgumentCollection';
 import { FunctionCallArgument } from './Argument/FunctionCallArgument';
 import { FunctionCall } from './FunctionCall';
 
 export function parseFunctionCalls(calls: FunctionCallsData): IFunctionCall[] {
-    if (!calls) {
+  if (calls === undefined) {
     throw new Error('undefined call data');
   }
   const sequence = getCallSequence(calls);
@@ -24,12 +24,19 @@ function getCallSequence(calls: FunctionCallsData): FunctionCallData[] {
 
 function parseFunctionCall(call: FunctionCallData): IFunctionCall {
   if (!call) {
-        throw new Error(`undefined function call`);
+    throw new Error('undefined function call');
   }
-    const args = new FunctionCallArgumentCollection();
+  const callArgs = parseArgs(call.parameters);
-    for (const parameterName of Object.keys(call.parameters || {})) {
+  return new FunctionCall(call.function, callArgs);
-        const arg = new FunctionCallArgument(parameterName, call.parameters[parameterName]);
+}
+
+function parseArgs(
+  parameters: FunctionCallParametersData,
+): FunctionCallArgumentCollection {
+  return Object.keys(parameters || {})
+    .map((parameterName) => new FunctionCallArgument(parameterName, parameters[parameterName]))
+    .reduce((args, arg) => {
       args.addArgument(arg);
-    }
+      return args;
-    return new FunctionCall(call.function, args);
+    }, new FunctionCallArgumentCollection());
 }

src/application/Parser/Script/Compiler/Function/ISharedFunction.ts

@@ -1,5 +1,5 @@
 import { IReadOnlyFunctionParameterCollection } from './Parameter/IFunctionParameterCollection';
-import { IFunctionCall } from '../Function/Call/IFunctionCall';
+import { IFunctionCall } from './Call/IFunctionCall';
 
 export interface ISharedFunction {
   readonly name: string;

src/application/Parser/Script/Compiler/Function/Parameter/FunctionParameter.ts

@@ -1,10 +1,11 @@
-import { IFunctionParameter } from './IFunctionParameter';
 import { ensureValidParameterName } from '../Shared/ParameterNameValidator';
+import { IFunctionParameter } from './IFunctionParameter';
 
 export class FunctionParameter implements IFunctionParameter {
   constructor(
     public readonly name: string,
-        public readonly isOptional: boolean) {
+    public readonly isOptional: boolean,
+  ) {
     ensureValidParameterName(name);
   }
 }

src/application/Parser/Script/Compiler/Function/Parameter/FunctionParameterCollection.ts

@@ -7,6 +7,7 @@ export class FunctionParameterCollection implements IFunctionParameterCollection
   public get all(): readonly IFunctionParameter[] {
     return this.parameters;
   }
+
   public addParameter(parameter: IFunctionParameter) {
     this.ensureValidParameter(parameter);
     this.parameters.push(parameter);
@@ -15,6 +16,7 @@ export class FunctionParameterCollection implements IFunctionParameterCollection
   private includesName(name: string) {
     return this.parameters.find((existingParameter) => existingParameter.name === name);
   }
+
   private ensureValidParameter(parameter: IFunctionParameter) {
     if (!parameter) {
       throw new Error('undefined parameter');

src/application/Parser/Script/Compiler/Function/SharedFunction.ts

@@ -1,11 +1,14 @@
-import { IFunctionCall } from '../Function/Call/IFunctionCall';
+import { IFunctionCall } from './Call/IFunctionCall';
-import { FunctionBodyType, IFunctionCode, ISharedFunction, ISharedFunctionBody } from './ISharedFunction';
+import {
+  FunctionBodyType, IFunctionCode, ISharedFunction, ISharedFunctionBody,
+} from './ISharedFunction';
 import { IReadOnlyFunctionParameterCollection } from './Parameter/IFunctionParameterCollection';
 
 export function createCallerFunction(
   name: string,
   parameters: IReadOnlyFunctionParameterCollection,
-    callSequence: readonly IFunctionCall[]): ISharedFunction {
+  callSequence: readonly IFunctionCall[],
+): ISharedFunction {
   if (!callSequence) {
     throw new Error(`undefined call sequence in function "${name}"`);
   }
@@ -19,7 +22,8 @@ export function createFunctionWithInlineCode(
   name: string,
   parameters: IReadOnlyFunctionParameterCollection,
   code: string,
-    revertCode?: string): ISharedFunction {
+  revertCode?: string,
+): ISharedFunction {
   if (!code) {
     throw new Error(`undefined code in function "${name}"`);
   }
@@ -32,6 +36,7 @@ export function createFunctionWithInlineCode(
 
 class SharedFunction implements ISharedFunction {
   public readonly body: ISharedFunctionBody;
+
   constructor(
     public readonly name: string,
     public readonly parameters: IReadOnlyFunctionParameterCollection,
@@ -39,7 +44,7 @@ class SharedFunction implements ISharedFunction {
     bodyType: FunctionBodyType,
   ) {
     if (!name) { throw new Error('undefined function name'); }
-        if (!parameters) { throw new Error(`undefined parameters`); }
+    if (!parameters) { throw new Error('undefined parameters'); }
     this.body = {
       type: bodyType,
       code: bodyType === FunctionBodyType.Code ? content as IFunctionCode : undefined,

src/application/Parser/Script/Compiler/Function/SharedFunctionsParser.ts

@@ -11,47 +11,51 @@ import { parseFunctionCalls } from './Call/FunctionCallParser';
 
 export class SharedFunctionsParser implements ISharedFunctionsParser {
   public static readonly instance: ISharedFunctionsParser = new SharedFunctionsParser();
+
   public parseFunctions(
-        functions: readonly FunctionData[]): ISharedFunctionCollection {
+    functions: readonly FunctionData[],
+  ): ISharedFunctionCollection {
     const collection = new SharedFunctionCollection();
     if (!functions || !functions.length) {
       return collection;
     }
     ensureValidFunctions(functions);
-        for (const func of functions) {
+    return functions
-            const sharedFunction = parseFunction(func);
+      .map((func) => parseFunction(func))
-            collection.addFunction(sharedFunction);
+      .reduce((acc, func) => {
-        }
+        acc.addFunction(func);
-        return collection;
+        return acc;
+      }, collection);
   }
 }
 
 function parseFunction(data: FunctionData): ISharedFunction {
-    const name = data.name;
+  const { name } = data;
   const parameters = parseParameters(data);
   if (hasCode(data)) {
     return createFunctionWithInlineCode(name, parameters, data.code, data.revertCode);
-    } else { // has call
+  }
+  // Has call
   const calls = parseFunctionCalls(data.call);
   return createCallerFunction(name, parameters, calls);
 }
-}
 
 function parseParameters(data: FunctionData): IReadOnlyFunctionParameterCollection {
-    const parameters = new FunctionParameterCollection();
+  return (data.parameters || [])
-    if (!data.parameters) {
+    .map((parameter) => {
-        return parameters;
-    }
-    for (const parameterData of data.parameters) {
-        const isOptional = parameterData.optional || false;
       try {
-            const parameter = new FunctionParameter(parameterData.name, isOptional);
+        return new FunctionParameter(
-            parameters.addParameter(parameter);
+          parameter.name,
+          parameter.optional || false,
+        );
       } catch (err) {
         throw new Error(`"${data.name}": ${err.message}`);
       }
-    }
+    })
+    .reduce((parameters, parameter) => {
+      parameters.addParameter(parameter);
       return parameters;
+    }, new FunctionParameterCollection());
 }
 
 function hasCode(data: FunctionData): boolean {
@@ -96,7 +100,7 @@ function ensureExpectedParametersType(functions: readonly FunctionData[]) {
   }
 }
 
-function isArrayOfObjects(value: any): boolean {
+function isArrayOfObjects(value: unknown): boolean {
   return Array.isArray(value)
     && value.every((item) => typeof item === 'object');
 }
@@ -115,15 +119,14 @@ function ensureNoDuplicatesInFunctionNames(functions: readonly FunctionData[]) {
 
 function ensureNoUndefinedItem(functions: readonly FunctionData[]) {
   if (functions.some((func) => !func)) {
-        throw new Error(`some functions are undefined`);
+    throw new Error('some functions are undefined');
   }
 }
 
 function ensureNoDuplicateCode(functions: readonly FunctionData[]) {
   const duplicateCodes = getDuplicates(functions
     .map((func) => func.code)
-        .filter((code) => code),
+    .filter((code) => code));
-    );
   if (duplicateCodes.length > 0) {
     throw new Error(`duplicate "code" in functions: ${printList(duplicateCodes)}`);
   }

src/application/Parser/Script/Compiler/IScriptCompiler.ts

@@ -1,5 +1,5 @@
-import { IScriptCode } from '@/domain/IScriptCode';
 import { ScriptData } from 'js-yaml-loader!@/*';
+import { IScriptCode } from '@/domain/IScriptCode';
 
 export interface IScriptCompiler {
   canCompile(script: ScriptData): boolean;

src/application/Parser/Script/Compiler/ScriptCompiler.ts

@@ -1,7 +1,6 @@
-import { IScriptCode } from '@/domain/IScriptCode';
-import { ScriptCode } from '@/domain/ScriptCode';
-import { ILanguageSyntax } from '@/domain/ScriptCode';
 import { FunctionData, ScriptData } from 'js-yaml-loader!@/*';
+import { IScriptCode } from '@/domain/IScriptCode';
+import { ScriptCode, ILanguageSyntax } from '@/domain/ScriptCode';
 import { IScriptCompiler } from './IScriptCompiler';
 import { ISharedFunctionCollection } from './Function/ISharedFunctionCollection';
 import { IFunctionCallCompiler } from './Function/Call/Compiler/IFunctionCallCompiler';
@@ -12,15 +11,17 @@ import { parseFunctionCalls } from './Function/Call/FunctionCallParser';
 
 export class ScriptCompiler implements IScriptCompiler {
   private readonly functions: ISharedFunctionCollection;
+
   constructor(
     functions: readonly FunctionData[] | undefined,
     private readonly syntax: ILanguageSyntax,
-        sharedFunctionsParser: ISharedFunctionsParser = SharedFunctionsParser.instance,
     private readonly callCompiler: IFunctionCallCompiler = FunctionCallCompiler.instance,
+    sharedFunctionsParser: ISharedFunctionsParser = SharedFunctionsParser.instance,
   ) {
     if (!syntax) { throw new Error('undefined syntax'); }
     this.functions = sharedFunctionsParser.parseFunctions(functions);
   }
+
   public canCompile(script: ScriptData): boolean {
     if (!script) { throw new Error('undefined script'); }
     if (!script.call) {
@@ -28,6 +29,7 @@ export class ScriptCompiler implements IScriptCompiler {
     }
     return true;
   }
+
   public compile(script: ScriptData): IScriptCode {
     if (!script) { throw new Error('undefined script'); }
     try {
@@ -36,7 +38,8 @@ export class ScriptCompiler implements IScriptCompiler {
       return new ScriptCode(
         compiledCode.code,
         compiledCode.revertCode,
-                this.syntax);
+        this.syntax,
+      );
     } catch (error) {
       throw Error(`Script "${script.name}" ${error.message}`);
     }

src/application/Parser/Script/ScriptParser.ts

@@ -1,26 +1,32 @@
-import { Script } from '@/domain/Script';
 import { ScriptData } from 'js-yaml-loader!@/*';
-import { parseDocUrls } from '../DocumentationParser';
+import { Script } from '@/domain/Script';
 import { RecommendationLevel } from '@/domain/RecommendationLevel';
 import { IScriptCode } from '@/domain/IScriptCode';
 import { ScriptCode } from '@/domain/ScriptCode';
+import { parseDocUrls } from '../DocumentationParser';
 import { createEnumParser, IEnumParser } from '../../Common/Enum';
 import { ICategoryCollectionParseContext } from './ICategoryCollectionParseContext';
 
 export function parseScript(
-    data: ScriptData, context: ICategoryCollectionParseContext,
+  data: ScriptData,
-    levelParser = createEnumParser(RecommendationLevel)): Script {
+  context: ICategoryCollectionParseContext,
+  levelParser = createEnumParser(RecommendationLevel),
+): Script {
   validateScript(data);
   if (!context) { throw new Error('undefined context'); }
   const script = new Script(
-        /* name */  data.name,
+    /* name: */ data.name,
-        /* code */  parseCode(data, context),
+    /* code: */ parseCode(data, context),
-        /* docs */  parseDocUrls(data),
+    /* docs: */ parseDocUrls(data),
-        /* level */ parseLevel(data.recommend, levelParser));
+    /* level: */ parseLevel(data.recommend, levelParser),
+  );
   return script;
 }
 
-function parseLevel(level: string, parser: IEnumParser<RecommendationLevel>): RecommendationLevel | undefined {
+function parseLevel(
+  level: string,
+  parser: IEnumParser<RecommendationLevel>,
+): RecommendationLevel | undefined {
   if (!level) {
     return undefined;
   }

src/application/Parser/Script/Syntax/BatchFileSyntax.ts

@@ -1,10 +1,10 @@
 import { ILanguageSyntax } from '@/domain/ScriptCode';
 
-
 const BatchFileCommonCodeParts = ['(', ')', 'else', '||'];
 const PowerShellCommonCodeParts = ['{', '}'];
 
 export class BatchFileSyntax implements ILanguageSyntax {
   public readonly commentDelimiters = ['REM', '::'];
+
   public readonly commonCodeParts = [...BatchFileCommonCodeParts, ...PowerShellCommonCodeParts];
 }

src/application/Parser/Script/Syntax/ISyntaxFactory.ts

@@ -1,5 +1,4 @@
 import { ILanguageSyntax } from '@/domain/ScriptCode';
 import { IScriptingLanguageFactory } from '@/application/Common/ScriptingLanguage/IScriptingLanguageFactory';
 
-export interface ISyntaxFactory extends IScriptingLanguageFactory<ILanguageSyntax> {
+export type ISyntaxFactory = IScriptingLanguageFactory<ILanguageSyntax>;
-}

src/application/Parser/Script/Syntax/ShellScriptSyntax.ts

@@ -2,5 +2,6 @@ import { ILanguageSyntax } from '@/domain/ScriptCode';
 
 export class ShellScriptSyntax implements ILanguageSyntax {
   public readonly commentDelimiters = ['#'];
+
   public readonly commonCodeParts = ['(', ')', 'else', 'fi'];
 }

src/application/Parser/Script/Syntax/SyntaxFactory.ts

@@ -5,7 +5,9 @@ import { BatchFileSyntax } from './BatchFileSyntax';
 import { ShellScriptSyntax } from './ShellScriptSyntax';
 import { ISyntaxFactory } from './ISyntaxFactory';
 
-export class SyntaxFactory extends ScriptingLanguageFactory<ILanguageSyntax> implements ISyntaxFactory {
+export class SyntaxFactory
+  extends ScriptingLanguageFactory<ILanguageSyntax>
+  implements ISyntaxFactory {
   constructor() {
     super();
     this.registerGetter(ScriptingLanguage.batchfile, () => new BatchFileSyntax());

src/application/Parser/ScriptingDefinition/CodeSubstituter.ts

@@ -3,9 +3,9 @@ import { ParameterSubstitutionParser } from '@/application/Parser/Script/Compile
 import { CompositeExpressionParser } from '@/application/Parser/Script/Compiler/Expressions/Parser/CompositeExpressionParser';
 import { ExpressionsCompiler } from '@/application/Parser/Script/Compiler/Expressions/ExpressionsCompiler';
 import { IProjectInformation } from '@/domain/IProjectInformation';
-import { ICodeSubstituter } from './ICodeSubstituter';
 import { FunctionCallArgumentCollection } from '@/application/Parser/Script/Compiler/Function/Call/Argument/FunctionCallArgumentCollection';
 import { FunctionCallArgument } from '@/application/Parser/Script/Compiler/Function/Call/Argument/FunctionCallArgument';
+import { ICodeSubstituter } from './ICodeSubstituter';
 
 export class CodeSubstituter implements ICodeSubstituter {
   constructor(
@@ -14,12 +14,13 @@ export class CodeSubstituter implements ICodeSubstituter {
   ) {
 
   }
+
   public substitute(code: string, info: IProjectInformation): string {
     if (!code) { throw new Error('undefined code'); }
     if (!info) { throw new Error('undefined info'); }
     const args = new FunctionCallArgumentCollection();
-        const substitute = (name: string, value: string) =>
+    const substitute = (name: string, value: string) => args
-            args.addArgument(new FunctionCallArgument(name, value));
+      .addArgument(new FunctionCallArgument(name, value));
     substitute('homepage', info.homepage);
     substitute('version', info.version);
     substitute('date', this.date.toUTCString());

src/application/Parser/ScriptingDefinition/ScriptingDefinitionParser.ts

@@ -1,5 +1,5 @@
-import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
 import { ScriptingDefinitionData } from 'js-yaml-loader!@/*';
+import { IScriptingDefinition } from '@/domain/IScriptingDefinition';
 import { ScriptingDefinition } from '@/domain/ScriptingDefinition';
 import { ScriptingLanguage } from '@/domain/ScriptingLanguage';
 import { IProjectInformation } from '@/domain/IProjectInformation';
@@ -13,9 +13,11 @@ export class ScriptingDefinitionParser {
     private readonly codeSubstituter: ICodeSubstituter = new CodeSubstituter(),
   ) {
   }
+
   public parse(
     definition: ScriptingDefinitionData,
-        info: IProjectInformation): IScriptingDefinition {
+    info: IProjectInformation,
+  ): IScriptingDefinition {
     if (!info) { throw new Error('undefined info'); }
     if (!definition) { throw new Error('undefined definition'); }
     const language = this.languageParser.parseEnum(definition.language, 'language');
@@ -28,4 +30,3 @@ export class ScriptingDefinitionParser {
     );
   }
 }
-

src/application/collections/macos.yaml

@@ -955,7 +955,7 @@ actions:
                                     sudo defaults write '/var/db/SystemPolicy-prefs' 'enabled' -string 'no'
                                     echo "Disabled Gatekeeper"
                                 else
-                                    >&2 echo "Unknown gatekeeper status: $gatekeeper_status"
+                                    >&2 echo "Unknown gatekeeper status: $gatekeeper_status"
                                 fi
                             fi
                         revertCode: |-
@@ -974,7 +974,7 @@ actions:
                                 elif [ $gatekeeper_status = "enabled" ]; then
                                     echo "No action needed, Gatekeeper is already enabled"
                                 else
-                                    >&2 echo "Unknown Gatekeeper status: $gatekeeper_status"
+                                    >&2 echo "Unknown Gatekeeper status: $gatekeeper_status"
                                 fi
                             fi
             -

src/domain/Application.ts

@@ -4,7 +4,10 @@ import { IProjectInformation } from './IProjectInformation';
 import { OperatingSystem } from './OperatingSystem';
 
 export class Application implements IApplication {
-    constructor(public info: IProjectInformation, public collections: readonly ICategoryCollection[]) {
+  constructor(
+    public info: IProjectInformation,
+    public collections: readonly ICategoryCollection[],
+  ) {
     validateInformation(info);
     validateCollections(collections);
   }
@@ -37,8 +40,8 @@ function validateCollections(collections: readonly ICategoryCollection[]) {
   const osList = collections.map((c) => c.os);
   const duplicates = getDuplicates(osList);
   if (duplicates.length > 0) {
-        throw new Error('multiple collections with same os: ' +
+    throw new Error(`multiple collections with same os: ${
-            duplicates.map((os) => OperatingSystem[os].toLowerCase()).join('", "'));
+      duplicates.map((os) => OperatingSystem[os].toLowerCase()).join('", "')}`);
   }
 }
 

src/domain/Category.ts

@@ -10,7 +10,8 @@ export class Category extends BaseEntity<number> implements ICategory {
     public readonly name: string,
     public readonly documentationUrls: ReadonlyArray<string>,
     public readonly subCategories?: ReadonlyArray<ICategory>,
-        public readonly scripts?: ReadonlyArray<IScript>) {
+    public readonly scripts?: ReadonlyArray<IScript>,
+  ) {
     super(id);
     validateCategory(this);
   }
@@ -20,7 +21,10 @@ export class Category extends BaseEntity<number> implements ICategory {
   }
 
   public getAllScriptsRecursively(): readonly IScript[] {
-        return this.allSubScripts || (this.allSubScripts = parseScriptsRecursively(this));
+    if (!this.allSubScripts) {
+      this.allSubScripts = parseScriptsRecursively(this);
+    }
+    return this.allSubScripts;
   }
 }
 
@@ -35,8 +39,10 @@ function validateCategory(category: ICategory) {
   if (!category.name) {
     throw new Error('undefined or empty name');
   }
-    if ((!category.subCategories || category.subCategories.length === 0) &&
+  if (
-        (!category.scripts || category.scripts.length === 0)) {
+    (!category.subCategories || category.subCategories.length === 0)
+      && (!category.scripts || category.scripts.length === 0)
+  ) {
     throw new Error('A category must have at least one sub-category or script');
   }
 }

src/domain/CategoryCollection.ts

@@ -1,4 +1,4 @@
-import { getEnumNames, getEnumValues, assertInRange } from '@/application/Common/Enum';
+import { getEnumValues, assertInRange } from '@/application/Common/Enum';
 import { IEntity } from '../infrastructure/Entity/IEntity';
 import { ICategory } from './ICategory';
 import { IScript } from './IScript';
@@ -9,6 +9,7 @@ import { ICategoryCollection } from './ICategoryCollection';
 
 export class CategoryCollection implements ICategoryCollection {
   public get totalScripts(): number { return this.queryable.allScripts.length; }
+
   public get totalCategories(): number { return this.queryable.allCategories.length; }
 
   private readonly queryable: IQueryableCollection;
@@ -16,7 +17,8 @@ export class CategoryCollection implements ICategoryCollection {
   constructor(
     public readonly os: OperatingSystem,
     public readonly actions: ReadonlyArray<ICategory>,
-        public readonly scripting: IScriptingDefinition) {
+    public readonly scripting: IScriptingDefinition,
+  ) {
     if (!scripting) {
       throw new Error('undefined scripting definition');
     }
@@ -32,7 +34,7 @@ export class CategoryCollection implements ICategoryCollection {
   }
 
   public getScriptsByLevel(level: RecommendationLevel): readonly IScript[] {
-        if (isNaN(level)) {
+    if (level === undefined) {
       throw new Error('undefined level');
     }
     if (!(level in RecommendationLevel)) {
@@ -55,20 +57,17 @@ export class CategoryCollection implements ICategoryCollection {
 }
 
 function ensureNoDuplicates<TKey>(entities: ReadonlyArray<IEntity<TKey>>) {
-    const totalOccurrencesById = new Map<TKey, number>();
+  const isUniqueInArray = (id: TKey, index: number, array: readonly TKey[]) => array
-    for (const entity of entities) {
+    .findIndex((otherId) => otherId === id) !== index;
-        totalOccurrencesById.set(entity.id, (totalOccurrencesById.get(entity.id) || 0) + 1);
+  const duplicatedIds = entities
-    }
+    .map((entity) => entity.id)
-    const duplicatedIds = new Array<TKey>();
+    .filter((id, index, array) => !isUniqueInArray(id, index, array))
-    totalOccurrencesById.forEach((index, id) => {
+    .filter(isUniqueInArray);
-        if (index > 1) {
-            duplicatedIds.push(id);
-        }
-    });
   if (duplicatedIds.length > 0) {
     const duplicatedIdsText = duplicatedIds.map((id) => `"${id}"`).join(',');
     throw new Error(
-            `Duplicate entities are detected with following id(s): ${duplicatedIdsText}`);
+      `Duplicate entities are detected with following id(s): ${duplicatedIdsText}`,
+    );
   }
 }
 
@@ -93,50 +92,42 @@ function ensureValidScripts(allScripts: readonly IScript[]) {
   if (!allScripts || allScripts.length === 0) {
     throw new Error('must consist of at least one script');
   }
-    for (const level of getEnumValues(RecommendationLevel)) {
+  const missingRecommendationLevels = getEnumValues(RecommendationLevel)
-        if (allScripts.every((script) => script.level !== level)) {
+    .filter((level) => allScripts.every((script) => script.level !== level));
-            throw new Error(`none of the scripts are recommended as ${RecommendationLevel[level]}`);
+  if (missingRecommendationLevels.length > 0) {
-        }
+    throw new Error('none of the scripts are recommended as'
+      + ` "${missingRecommendationLevels.map((level) => RecommendationLevel[level]).join(', "')}".`);
   }
 }
 
-function flattenApplication(categories: ReadonlyArray<ICategory>): [ICategory[], IScript[]] {
+function flattenApplication(
-    const allCategories = new Array<ICategory>();
+  categories: ReadonlyArray<ICategory>,
-    const allScripts = new Array<IScript>();
+): [ICategory[], IScript[]] {
-    flattenCategories(categories, allCategories, allScripts);
+  const [subCategories, subScripts] = (categories || [])
+    // Parse children
+    .map((category) => flattenApplication(category.subCategories))
+    // Flatten results
+    .reduce(([previousCategories, previousScripts], [currentCategories, currentScripts]) => {
       return [
-        allCategories,
+        [...previousCategories, ...currentCategories],
-        allScripts,
+        [...previousScripts, ...currentScripts],
+      ];
+    }, [new Array<ICategory>(), new Array<IScript>()]);
+  return [
+    [
+      ...(categories || []),
+      ...subCategories,
+    ],
+    [
+      ...(categories || []).flatMap((category) => category.scripts || []),
+      ...subScripts,
+    ],
   ];
 }
 
-function flattenCategories(
-    categories: ReadonlyArray<ICategory>,
-    allCategories: ICategory[],
-    allScripts: IScript[]): IQueryableCollection {
-    if (!categories || categories.length === 0) {
-        return;
-    }
-    for (const category of categories) {
-        allCategories.push(category);
-        flattenScripts(category.scripts, allScripts);
-        flattenCategories(category.subCategories, allCategories, allScripts);
-    }
-}
-
-function flattenScripts(
-    scripts: ReadonlyArray<IScript>,
-    allScripts: IScript[]): IScript[] {
-    if (!scripts) {
-        return;
-    }
-    for (const script of scripts) {
-        allScripts.push(script);
-    }
-}
-
 function makeQueryable(
-    actions: ReadonlyArray<ICategory>): IQueryableCollection {
+  actions: ReadonlyArray<ICategory>,
+): IQueryableCollection {
   const flattened = flattenApplication(actions);
   return {
     allCategories: flattened[0],
@@ -145,12 +136,18 @@ function makeQueryable(
   };
 }
 
-function groupByLevel(allScripts: readonly IScript[]): Map<RecommendationLevel, readonly IScript[]> {
+function groupByLevel(
-    const map = new Map<RecommendationLevel, readonly IScript[]>();
+  allScripts: readonly IScript[],
-    for (const levelName of getEnumNames(RecommendationLevel)) {
+): Map<RecommendationLevel, readonly IScript[]> {
-        const level = RecommendationLevel[levelName];
+  return getEnumValues(RecommendationLevel)
-        const scripts = allScripts.filter((script) => script.level !== undefined && script.level <= level);
+    .map((level) => ({
-        map.set(level, scripts);
+      level,
-    }
+      scripts: allScripts.filter(
+        (script) => script.level !== undefined && script.level <= level,
+      ),
+    }))
+    .reduce((map, group) => {
+      map.set(group.level, group.scripts);
       return map;
+    }, new Map<RecommendationLevel, readonly IScript[]>());
 }

src/domain/IProjectInformation.ts

@@ -1,4 +1,5 @@
 import { OperatingSystem } from './OperatingSystem';
+
 export interface IProjectInformation {
   readonly name: string;
   readonly version: string;

src/domain/ProjectInformation.ts

@@ -1,9 +1,10 @@
+import { assertInRange } from '@/application/Common/Enum';
 import { IProjectInformation } from './IProjectInformation';
 import { OperatingSystem } from './OperatingSystem';
-import { assertInRange } from '@/application/Common/Enum';
 
 export class ProjectInformation implements IProjectInformation {
   public readonly repositoryWebUrl: string;
+
   constructor(
     public readonly name: string,
     public readonly version: string,
@@ -24,12 +25,15 @@ export class ProjectInformation implements IProjectInformation {
     }
     this.repositoryWebUrl = getWebUrl(this.repositoryUrl);
   }
+
   public getDownloadUrl(os: OperatingSystem): string {
     return `${this.repositoryWebUrl}/releases/download/${this.version}/${getFileName(os, this.version)}`;
   }
+
   public get feedbackUrl(): string {
     return `${this.repositoryWebUrl}/issues`;
   }
+
   public get releaseUrl(): string {
     return `${this.repositoryWebUrl}/releases/tag/${this.version}`;
   }