style(idempotency): apply standardized formatting

.eslintrc.js

@@ -1,68 +1,72 @@
 module.exports = {
-  root: true,
   env: {
     browser: false,
     es2020: true,
     jest: true,
     node: true,
   },
-  extends: [ 'plugin:@typescript-eslint/eslint-recommended', 'plugin:@typescript-eslint/recommended' ],
+  ignorePatterns: ['coverage', 'lib', 'cdk.out', 'dist', 'node_modules'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
   parser: '@typescript-eslint/parser',
-  plugins: ['@typescript-eslint'],
+  plugins: ['@typescript-eslint', 'prettier'],
   settings: {
     'import/resolver': {
       node: {},
       typescript: {
-        project: './tsconfig.es.json',
+        project: './tsconfig.json',
         alwaysTryTypes: true,
       },
     },
   },
   rules: {
-    '@typescript-eslint/ban-ts-ignore': ['off'],
-    '@typescript-eslint/camelcase': ['off'],
-    '@typescript-eslint/explicit-function-return-type': [ 'error', { allowExpressions: true } ],
-    '@typescript-eslint/explicit-member-accessibility': 'error',
-    '@typescript-eslint/indent': [ 'error', 2, { SwitchCase: 1 } ],
-    '@typescript-eslint/interface-name-prefix': ['off'],
-    '@typescript-eslint/member-delimiter-style': [ 'error', { multiline: { delimiter: 'none' } } ],
+    '@typescript-eslint/explicit-function-return-type': [
+      'error',
+      { allowExpressions: true },
+    ], // Enforce return type definitions for functions
+    '@typescript-eslint/explicit-member-accessibility': 'error', // Enforce explicit accessibility modifiers on class properties and methods (public, private, protected)
     '@typescript-eslint/member-ordering': [
+      // Standardize the order of class members
       'error',
       {
         default: {
           memberTypes: [
             'signature',
-            'public-field', // = ["public-static-field", "public-instance-field"]
-            'protected-field', // = ["protected-static-field", "protected-instance-field"]
-            'private-field', // = ["private-static-field", "private-instance-field"]
+            'public-field',
+            'protected-field',
+            'private-field',
             'constructor',
-            'public-method', // = ["public-static-method", "public-instance-method"]
-            'protected-method', // = ["protected-static-method", "protected-instance-method"]
-            'private-method', // = ["private-static-method", "private-instance-method"]
+            'public-method',
+            'protected-method',
+            'private-method',
           ],
           order: 'alphabetically',
         },
       },
     ],
-    '@typescript-eslint/no-explicit-any': 'error',
-    '@typescript-eslint/no-inferrable-types': ['off'],
-    '@typescript-eslint/no-unused-vars': [ 'error', { argsIgnorePattern: '^_' } ],
-    '@typescript-eslint/no-use-before-define': ['off'],
-    '@typescript-eslint/semi': [ 'error', 'always' ],
-    'array-bracket-spacing': [ 'error', 'always', { singleValue: false } ],
-    'arrow-body-style': [ 'error', 'as-needed' ],
-    'computed-property-spacing': [ 'error', 'never' ],
-    'func-style': [ 'warn', 'expression' ],
-    indent: [ 'error', 2, { SwitchCase: 1 } ],
-    'keyword-spacing': 'error',
-    'newline-before-return': 2,
-    'no-console': 0,
-    'no-multi-spaces': [ 'error', { ignoreEOLComments: false } ],
-    'no-multiple-empty-lines': [ 'error', { max: 1, maxBOF: 0 } ],
-    'no-throw-literal': 'error',
-    'object-curly-spacing': [ 'error', 'always' ],
-    'prefer-arrow-callback': 'error',
-    quotes: [ 'error', 'single', { allowTemplateLiterals: true } ],
-    semi: [ 'error', 'always' ]
-  }
+    '@typescript-eslint/no-explicit-any': 'error', // Disallow usage of the any type
+    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }], // Disallow unused variables, except for variables starting with an underscore
+    '@typescript-eslint/no-use-before-define': ['off'], // Check if this rule is needed
+    'no-unused-vars': 'off', // Disable eslint core rule, since it's replaced by @typescript-eslint/no-unused-vars
+    // Rules from eslint core https://eslint.org/docs/latest/rules/
+    'array-bracket-spacing': ['error', 'never'], // Disallow spaces inside of array brackets
+    'computed-property-spacing': ['error', 'never'], // Disallow spaces inside of computed properties
+    'func-style': ['warn', 'expression'], // Enforce function expressions instead of function declarations
+    'keyword-spacing': 'error', // Enforce spaces after keywords and before parenthesis, e.g. if (condition) instead of if(condition)
+    'padding-line-between-statements': [
+      // Require an empty line before return statements
+      'error',
+      { blankLine: 'always', prev: '*', next: 'return' },
+    ],
+    'no-console': 0, // Allow console.log statements
+    'no-multi-spaces': ['error', { ignoreEOLComments: false }], // Disallow multiple spaces except for comments
+    'no-multiple-empty-lines': ['error', { max: 1, maxBOF: 0, maxEOF: 0 }], // Enforce no empty line at the beginning & end of files and max 1 empty line between consecutive statements
+    'no-throw-literal': 'error', // Disallow throwing literals as exceptions, e.g. throw 'error' instead of throw new Error('error')
+    'object-curly-spacing': ['error', 'always'], // Enforce spaces inside of curly braces in objects
+    'prefer-arrow-callback': 'error', // Enforce arrow functions instead of anonymous functions for callbacks
+    quotes: ['error', 'single', { allowTemplateLiterals: true }], // Enforce single quotes except for template strings
+    semi: ['error', 'always'], // Require semicolons instead of ASI (automatic semicolon insertion) at the end of statements
+  },
 };