Refactor to remove hardcoding of aliases

Unify definition of  aliases in single place.

Make TypeScript configuration file (`tsconfig.json`) source of truth
regarding aliases.

Both webpack (through `vue.config.js`) and ESLint (through
`.eslintrc.js`) now reads the alias configuration from `tsconfig.json`.

.eslintrc.js

@@ -4,6 +4,7 @@ const { rules: baseES6Rules } = require('eslint-config-airbnb-base/rules/es6');
 const { rules: baseImportsRules } = require('eslint-config-airbnb-base/rules/imports');
 const { rules: baseStyleRules } = require('eslint-config-airbnb-base/rules/style');
 const { rules: baseVariablesRules } = require('eslint-config-airbnb-base/rules/variables');
+const tsconfigJson = require('./tsconfig.json');
 
 module.exports = {
   root: true,
@@ -76,9 +77,8 @@ function getOwnRules() {
         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!@/..
+          ...getAliasesFromTsConfig(),
+          'js-yaml-loader!@/**',
         ].map((pattern) => ({ pattern, group: 'internal' })),
       },
     ],
@@ -284,3 +284,8 @@ function getTypeScriptOverrides() {
     // ],
   };
 }
+
+function getAliasesFromTsConfig() {
+  return Object.keys(tsconfigJson.compilerOptions.paths)
+    .map((path) => `${path}*`);
+}

tsconfig.json

@@ -29,8 +29,8 @@
       ],
       "@tests/*": [
         "tests/*"
-      ],
-    },
+      ]
+    }
   },
   "include": [
     "src/**/*.ts",

vue.config.js

@@ -1,6 +1,7 @@
 const { resolve } = require('path');
 const { defineConfig } = require('@vue/cli-service');
 const packageJson = require('./package.json');
+const tsconfigJson = require('./tsconfig.json');
 
 loadVueAppRuntimeVariables();
 
@@ -12,8 +13,8 @@ module.exports = defineConfig({
   },
   configureWebpack: {
     resolve: {
-      alias: { // also requires path alias in tsconfig.json
-        '@tests': resolve(__dirname, 'tests/'),
+      alias: {
+        ...getAliasesFromTsConfig(),
       },
       fallback: {
         /* Tell webpack to ignore polyfilling them because Node core modules are never used
@@ -78,3 +79,15 @@ function ignorePolyfills(...moduleNames) {
     return obj;
   }, {});
 }
+
+function getAliasesFromTsConfig() {
+  const { paths } = tsconfigJson.compilerOptions;
+  return Object.keys(paths).reduce((aliases, pathName) => {
+    const pathFolder = paths[pathName][0];
+    const aliasFolder = pathFolder.substring(0, pathFolder.length - 1); // trim * from end
+    const aliasName = pathName.substring(0, pathName.length - 2); // trim /* from end
+    const aliasPath = resolve(__dirname, aliasFolder);
+    aliases[aliasName] = aliasPath;
+    return aliases;
+  }, {});
+}