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

@@ -4,64 +4,67 @@ const NewLine = '\n';
 const TotalFunctionSeparatorChars = 58;
 
 export abstract class CodeBuilder implements ICodeBuilder {
-    private readonly lines = new Array<string>();
+  private readonly lines = new Array<string>();
 
-    // Returns current line starting from 0 (no lines), or 1 (have single line)
-    public get currentLine(): number {
-        return this.lines.length;
+  // Returns current line starting from 0 (no lines), or 1 (have single line)
+  public get currentLine(): number {
+    return this.lines.length;
+  }
+
+  public appendLine(code?: string): CodeBuilder {
+    if (!code) {
+      this.lines.push('');
+      return this;
     }
-
-    public appendLine(code?: string): CodeBuilder {
-        if (!code) {
-            this.lines.push('');
-            return this;
-        }
-        const lines = code.match(/[^\r\n]+/g);
-        for (const line of lines) {
-            this.lines.push(line);
-        }
-        return this;
+    const lines = code.match(/[^\r\n]+/g);
+    for (const line of lines) {
+      this.lines.push(line);
     }
+    return this;
+  }
 
-    public appendTrailingHyphensCommentLine(
-        totalRepeatHyphens: number = TotalFunctionSeparatorChars): CodeBuilder {
-        return this.appendCommentLine('-'.repeat(totalRepeatHyphens));
+  public appendTrailingHyphensCommentLine(
+    totalRepeatHyphens: number = TotalFunctionSeparatorChars,
+  ): CodeBuilder {
+    return this.appendCommentLine('-'.repeat(totalRepeatHyphens));
+  }
+
+  public appendCommentLine(commentLine?: string): CodeBuilder {
+    this.lines.push(`${this.getCommentDelimiter()} ${commentLine}`);
+    return this;
+  }
+
+  public appendFunction(name: string, code: string): CodeBuilder {
+    if (!name) { throw new Error('name cannot be empty or null'); }
+    if (!code) { throw new Error('code cannot be empty or null'); }
+    return this
+      .appendCommentLineWithHyphensAround(name)
+      .appendLine(this.writeStandardOut(`--- ${name}`))
+      .appendLine(code)
+      .appendTrailingHyphensCommentLine();
+  }
+
+  public appendCommentLineWithHyphensAround(
+    sectionName: string,
+    totalRepeatHyphens: number = TotalFunctionSeparatorChars,
+  ): CodeBuilder {
+    if (!sectionName) { throw new Error('sectionName cannot be empty or null'); }
+    if (sectionName.length >= totalRepeatHyphens) {
+      return this.appendCommentLine(sectionName);
     }
+    const firstHyphens = '-'.repeat(Math.floor((totalRepeatHyphens - sectionName.length) / 2));
+    const secondHyphens = '-'.repeat(Math.ceil((totalRepeatHyphens - sectionName.length) / 2));
+    return this
+      .appendTrailingHyphensCommentLine()
+      .appendCommentLine(firstHyphens + sectionName + secondHyphens)
+      .appendTrailingHyphensCommentLine(TotalFunctionSeparatorChars);
+  }
 
-    public appendCommentLine(commentLine?: string): CodeBuilder {
-        this.lines.push(`${this.getCommentDelimiter()} ${commentLine}`);
-        return this;
-    }
+  public toString(): string {
+    return this.lines.join(NewLine);
+  }
 
-    public appendFunction(name: string, code: string): CodeBuilder {
-        if (!name)  { throw new Error('name cannot be empty or null'); }
-        if (!code)  { throw new Error('code cannot be empty or null'); }
-        return this
-            .appendCommentLineWithHyphensAround(name)
-            .appendLine(this.writeStandardOut(`--- ${name}`))
-            .appendLine(code)
-            .appendTrailingHyphensCommentLine();
-    }
+  protected abstract getCommentDelimiter(): string;
 
-    public appendCommentLineWithHyphensAround(
-        sectionName: string,
-        totalRepeatHyphens: number = TotalFunctionSeparatorChars): CodeBuilder {
-        if (!sectionName)  { throw new Error('sectionName cannot be empty or null'); }
-        if (sectionName.length >= totalRepeatHyphens) {
-            return this.appendCommentLine(sectionName);
-        }
-        const firstHyphens = '-'.repeat(Math.floor((totalRepeatHyphens - sectionName.length) / 2));
-        const secondHyphens = '-'.repeat(Math.ceil((totalRepeatHyphens - sectionName.length) / 2));
-        return this
-            .appendTrailingHyphensCommentLine()
-            .appendCommentLine(firstHyphens + sectionName + secondHyphens)
-            .appendTrailingHyphensCommentLine(TotalFunctionSeparatorChars);
-    }
-
-    public toString(): string {
-        return this.lines.join(NewLine);
-    }
-
-    protected abstract getCommentDelimiter(): string;
-    protected abstract writeStandardOut(text: string): string;
+  protected abstract writeStandardOut(text: string): string;
 }