eslint.config.mjs

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

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

export default [
    ...compat.extends('eslint:recommended'), {
        plugins: {
            mocha,
        },

        languageOptions: {
            globals: {
                ...globals.mocha,
                ...globals.node,
            },

            ecmaVersion: 2020,
            sourceType: 'commonjs',
        },

        rules: {
            semi: [2, 'always'],
            quotes: ['error', 'single'],
        },
    },
    ...compat.extends(
        'eslint:recommended',
        'plugin:@typescript-eslint/eslint-recommended',
        'plugin:@typescript-eslint/recommended',
    ).map(config => ({
        ...config,
        files: ['test/*.ts'],
    })),
    {
        files: ['test/*.ts'],

        plugins: {
            '@typescript-eslint': typescriptEslint,
        },

        languageOptions: {
            parser: tsParser,
        },

        rules: {
            '@typescript-eslint/ban-ts-comment': 'off',
        },
    },
    {
        files: ['**/*.mjs', 'lib/*.js', 'wasm/*.js'],

        languageOptions: {
            ecmaVersion: 2022,
            sourceType: 'module',
        },
    },
    {
        files: ['test/integration/browser*/*.js', 'example/browser/**/*.js'],

        languageOptions: {
            globals: {
                ...globals.browser,
            },

            ecmaVersion: 2020,
            sourceType: 'module',
        },
    }
];