Refactor code to comply with ESLint rules

Major refactoring using ESLint with rules from AirBnb and Vue.

Enable most of the ESLint rules and do necessary linting in the code.
Also add more information for rules that are disabled to describe what
they are and why they are disabled.

Allow logging (`console.log`) in test files, and in development mode
(e.g. when working with `npm run serve`), but disable it when
environment is production (as pre-configured by Vue). Also add flag
(`--mode production`) in `lint:eslint` command so production linting is
executed earlier in lifecycle.

Disable rules that requires a separate work. Such as ESLint rules that
are broken in TypeScript: no-useless-constructor (eslint/eslint#14118)
and no-shadow (eslint/eslint#13014).

src/application/Environment/BrowserOs/DetectorBuilder.ts

@@ -1,53 +1,54 @@
-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>();
+  private readonly existingPartsInUserAgent = new Array<string>();
 
-    constructor(private readonly os: OperatingSystem) { }
+  private readonly notExistingPartsInUserAgent = new Array<string>();
 
-    public mustInclude(str: string): DetectorBuilder {
-        return this.add(str, this.existingPartsInUserAgent);
+  constructor(private readonly os: OperatingSystem) { }
+
+  public mustInclude(str: string): DetectorBuilder {
+    return this.add(str, this.existingPartsInUserAgent);
+  }
+
+  public mustNotInclude(str: string): DetectorBuilder {
+    return this.add(str, this.notExistingPartsInUserAgent);
+  }
+
+  public build(): IBrowserOsDetector {
+    if (!this.existingPartsInUserAgent.length) {
+      throw new Error('Must include at least a part');
     }
+    return {
+      detect: (agent) => this.detect(agent),
+    };
+  }
 
-    public mustNotInclude(str: string): DetectorBuilder {
-        return this.add(str, this.notExistingPartsInUserAgent);
+  private detect(userAgent: string): OperatingSystem {
+    if (!userAgent) {
+      throw new Error('User agent is null or undefined');
     }
+    if (this.existingPartsInUserAgent.some((part) => !userAgent.includes(part))) {
+      return undefined;
+    }
+    if (this.notExistingPartsInUserAgent.some((part) => userAgent.includes(part))) {
+      return undefined;
+    }
+    return this.os;
+  }
 
-    public build(): IBrowserOsDetector {
-        if (!this.existingPartsInUserAgent.length) {
-            throw new Error('Must include at least a part');
-        }
-        return {
-            detect: (agent) => this.detect(agent),
-        };
+  private add(part: string, array: string[]): DetectorBuilder {
+    if (!part) {
+      throw new Error('part is empty or undefined');
     }
-
-    private detect(userAgent: string): OperatingSystem {
-        if (!userAgent) {
-            throw new Error('User agent is null or undefined');
-        }
-        if (this.existingPartsInUserAgent.some((part) => !userAgent.includes(part))) {
-            return undefined;
-        }
-        if (this.notExistingPartsInUserAgent.some((part) => userAgent.includes(part))) {
-            return undefined;
-        }
-        return this.os;
+    if (this.existingPartsInUserAgent.includes(part)) {
+      throw new Error(`part ${part} is already included as existing part`);
     }
-
-    private add(part: string, array: string[]): DetectorBuilder {
-        if (!part) {
-            throw new Error('part is empty or undefined');
-        }
-        if (this.existingPartsInUserAgent.includes(part)) {
-            throw new Error(`part ${part} is already included as existing part`);
-        }
-        if (this.notExistingPartsInUserAgent.includes(part)) {
-            throw new Error(`part ${part} is already included as not existing part`);
-        }
-        array.push(part);
-        return this;
+    if (this.notExistingPartsInUserAgent.includes(part)) {
+      throw new Error(`part ${part} is already included as not existing part`);
     }
+    array.push(part);
+    return this;
+  }
 }