Added typescript, test and feature for comma seperated packages

eslint.config.js

@@ -1,9 +1,96 @@
-import globals from "globals";
-import pluginJs from "@eslint/js";
+import eslintJs from '@eslint/js';
+import tsParser from '@typescript-eslint/parser';
 
+import globals from 'globals';
+import eslintTs from 'typescript-eslint';
 
-/** @type {import('eslint').Linter.Config[]} */
-export default [
-  {languageOptions: { globals: globals.browser }},
-  pluginJs.configs.recommended,
-];
+const tsFiles = ['{src,lib}/**/*.{ts,tsx}'];
+
+const languageOptions = {
+  globals: {
+    ...globals.node,
+    ...globals.jest,
+  },
+  ecmaVersion: 2023,
+  sourceType: 'module',
+};
+
+const rules = {
+  '@typescript-eslint/no-use-before-define': 'off',
+  'require-await': 'off',
+  'no-duplicate-imports': 'error',
+  'no-unneeded-ternary': 'error',
+  'prefer-object-spread': 'error',
+  '@typescript-eslint/array-type': 'off',
+  '@typescript-eslint/ban-ts-comment': 'off',
+  '@typescript-eslint/no-explicit-any': 'off',
+  '@typescript-eslint/no-unused-vars': [
+    'error',
+    {
+      ignoreRestSiblings: true,
+      args: 'none',
+    },
+  ],
+};
+
+const commonIgnores = [
+  'node_modules',
+  '**/node_modules',
+  '**/dist/*',
+  'docs/*',
+  'build/*',
+  'dist/*',
+  'next.config.mjs',
+];
+
+const customTypescriptConfig = {
+  files: tsFiles,
+  plugins: {
+    'import/parsers': tsParser,
+  },
+  languageOptions: {
+    ...languageOptions,
+    parser: tsParser,
+    parserOptions: {
+      project: './tsconfig.json',
+      sourceType: 'module',
+    },
+  },
+  settings: {
+    'import/parsers': {
+      '@typescript-eslint/parser': ['.ts'],
+    },
+  },
+  rules: {
+
+    ...rules,
+  },
+  ignores: commonIgnores,
+};
+
+// Add the files for applying the recommended TypeScript configs
+// only for the Typescript files.
+// This is necessary when we have the multiple extensions files
+// (e.g. .ts, .tsx, .js, .cjs, .mjs, etc.).
+const recommendedTypeScriptConfigs = [
+  ...eslintTs.configs.recommended.map((config) => ({
+    ...config,
+    files: tsFiles,
+    rules: {
+      ...config.rules,
+      ...rules,
+    },
+    ignores: commonIgnores,
+  })),
+  ...eslintTs.configs.stylistic.map((config) => ({
+    ...config,
+    files: tsFiles,
+    rules: {
+      ...config.rules,
+      ...rules,
+    },
+    ignores: commonIgnores,
+  })),
+];
+
+export default [...recommendedTypeScriptConfigs, customTypescriptConfig];