New ESLint config

- Replaced `.eslintrc` with `.eslintrc.cjs` for better JavaScript file supports
and config seperation on different file types.
- Added `tsconfig.eslint.json`.

Author: iamWing

.eslintrc

@@ -0,0 +1,103 @@
+const baseConfig = {
+  env: { node: true },
+  plugins: ['import'],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: ['./tsconfig.eslint.json'],
+  },
+  extends: [
+    'airbnb',
+    'airbnb/hooks',
+    'plugin:import/recommended',
+  ],
+  rules: {
+    'max-len': [
+      'warn',
+      {
+        code: 80,
+        tabWidth: 2,
+        ignoreComments: true,
+      },
+    ],
+    'no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+    'import/order': [
+      'error',
+      { alphabetize: { order: 'asc' } },
+    ],
+  },
+};
+
+const tsConfig = {
+  files: ['*.ts', '*.tsx'],
+  excludedFiles: ['*.spec.ts', '*.spec.tsx', '*.test.ts', '*.test.tsx'],
+  plugins: [
+    ...baseConfig.plugins,
+    '@typescript-eslint',
+  ],
+  extends: [
+    ...baseConfig.extends,
+    'airbnb-typescript',
+    'plugin:import/typescript',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+  ],
+  rules: {
+    ...baseConfig.rules,
+    // disable rules covered by TypesScript compiler
+    'import/default': 'off',
+    'import/named': 'off',
+    'import/namespace': 'off',
+    'import/no-named-as-default-member': 'off',
+    // disable rules for better local performance
+    'import/no-cycle': 'off',
+    'import/no-deprecated': 'off',
+    'import/no-named-as-default': 'off',
+    'import/no-unused-modules': 'off',
+  },
+  settings: {
+    'import/parsers': { '@typescript-eslint/parser': ['.ts', '.tsx'] },
+    'import/resolver': {
+      typescript: {
+        alwaysTryTypes: true,
+        project: ['./tsconfig.eslint.json'],
+      },
+    },
+  },
+};
+
+const jestConfig = {
+  files: ['*.spec.ts', '*.spec.tsx', '*.test.ts', '*.test.tsx'],
+  env: { node: true, 'jest/globals': true },
+  plugins: [
+    ...tsConfig.plugins,
+    'jest',
+  ],
+  extends: [
+    ...tsConfig.extends,
+    'plugin:jest/recommended',
+    'plugin:jest/style',
+  ],
+  rules: {
+    ...tsConfig.rules,
+    '@typescript-eslint/no-non-null-assertion': 'off',
+  },
+  settings: tsConfig.settings,
+};
+
+const specialConfig = {
+  files: ['**/*.config.js', '**/*.config.*.js'],
+  rules: {
+    ...baseConfig.rules,
+    'import/no-extraneous-dependencies': 'off',
+  },
+};
+
+module.exports = {
+  root: true,
+  ...baseConfig,
+  overrides: [
+    tsConfig,
+    jestConfig,
+    specialConfig,
+  ],
+};

.eslintrc.cjs

@@ -0,0 +1,13 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true
+  },
+  "include": [
+    "src/**/*",
+    "tests/**/*",
+    ".eslintrc.cjs",
+    "**/*.config.js",
+    "**/*.config.*.js",
+  ]
+}