eslint.config.mjs

import jest from "eslint-plugin-jest";
import typescriptEslint from "@typescript-eslint/eslint-plugin";
import globals from "globals";
import tsParser from "@typescript-eslint/parser";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { FlatCompat } from "@eslint/eslintrc";
import eslintJs from "@eslint/js";
import eslintTs from 'typescript-eslint';
import importPlugin from 'eslint-plugin-import';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const compat = new FlatCompat({
    baseDirectory: __dirname,
    recommendedConfig: eslintJs.configs.recommended,
    allConfig: eslintJs.configs.all
});

const languageOptions = {
    globals: {
        ...globals.node,
        ...globals.jest,
        ...jest.environments.globals.globals,
    },
    ecmaVersion: 2023,
    sourceType: 'module',
}

const tsFiles = ['{src,tests}/**/*.ts']

// 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,
    })),
    ...eslintTs.configs.stylistic.map((config) => ({
        ...config,
        files: tsFiles,
    })),
]

const customTypescriptConfig = {
    files: tsFiles,
    plugins: {
        import: importPlugin,
        'import/parsers': tsParser,
        jest,
        "@typescript-eslint": typescriptEslint,
    },

    languageOptions: {
        ...languageOptions,
        parser: tsParser,
        ecmaVersion: 9,
        parserOptions: {
            project: "./tsconfig.json",
        },
    },

    rules: {
        "no-console": "off",
        "i18n-text/no-en": "off",
        "eslint-comments/no-use": "off",
        "import/no-namespace": "off",
        "no-unused-vars": "off",
        "@typescript-eslint/no-unused-vars": "error",

        "@typescript-eslint/explicit-member-accessibility": ["error", {
            accessibility: "no-public",
        }],

        "@typescript-eslint/no-require-imports": "error",
        "@typescript-eslint/array-type": "error",
        "@typescript-eslint/await-thenable": "error",
        "@typescript-eslint/ban-ts-comment": "error",
        camelcase: "off",
        "@typescript-eslint/consistent-type-assertions": "error",

        "@typescript-eslint/explicit-function-return-type": ["error", {
            allowExpressions: true,
        }],

        "@typescript-eslint/no-array-constructor": "error",
        "@typescript-eslint/no-empty-interface": "error",
        "@typescript-eslint/no-explicit-any": "error",
        "@typescript-eslint/no-extraneous-class": "error",
        "@typescript-eslint/no-for-in-array": "error",
        "@typescript-eslint/no-inferrable-types": "error",
        "@typescript-eslint/no-misused-new": "error",
        "@typescript-eslint/no-namespace": "error",
        "@typescript-eslint/no-non-null-assertion": "warn",
        "@typescript-eslint/no-unnecessary-qualifier": "error",
        "@typescript-eslint/no-unnecessary-type-assertion": "error",
        "@typescript-eslint/no-useless-constructor": "error",
        "@typescript-eslint/no-var-requires": "error",
        "@typescript-eslint/prefer-for-of": "warn",
        "@typescript-eslint/prefer-function-type": "warn",
        "@typescript-eslint/prefer-includes": "error",
        "@typescript-eslint/prefer-string-starts-ends-with": "error",
        "@typescript-eslint/promise-function-async": "error",
        "@typescript-eslint/require-array-sort-compare": "error",
        "@typescript-eslint/restrict-plus-operands": "error",
        semi: "off",
        "@typescript-eslint/unbound-method": "error",

        "prettier/prettier": ["error", {
            printWidth: 120,
            tabWidth: 2,
            useTabs: false,
            semi: true,
            singleQuote: true,
            trailingComma: "all",
            bracketSpacing: false,
            arrowParens: "always",
        }],

        "filenames/match-regex": "off",
        "no-shadow": "off",
        "@typescript-eslint/no-shadow": ["error"],
    },
}

export default [
    { ignores: ["**/dist/", "**/node_modules/"] },
    eslintJs.configs.recommended,
    ...compat.extends("plugin:github/recommended"),
    ...recommendedTypeScriptConfigs,
    customTypescriptConfig,
];