.eslintrc.js

module.exports = {
    root: true,
    env: {
        node: true,
    },
    extends: ['eslint:recommended', 'prettier'],
    rules: {
        'prefer-template': ['error'],
        'object-shorthand': ['error'],
    },
    overrides: [
        {
            files: ['*.mjs'],
            parserOptions: {
                ecmaVersion: 'latest',
                sourceType: 'module',
            },
        },
        {
            files: ['*.ts', '*.tsx'],
            parser: '@typescript-eslint/parser',
            parserOptions: {
                project: './test/tsconfig.json',
            },
            plugins: ['@typescript-eslint'],
            extends: [
                'eslint:recommended',
                'plugin:@typescript-eslint/recommended',
                'plugin:import/errors',
                'plugin:import/warnings',
                'plugin:import/typescript',
                'prettier',
            ],
            rules: {
                'no-unused-expressions': ['off'],
                '@typescript-eslint/no-unused-expressions': ['error'],
                'no-unused-vars': ['off'],
                '@typescript-eslint/no-unused-vars': ['error'],
                'no-shadow': ['off'],
                '@typescript-eslint/no-shadow': ['error'],

                '@typescript-eslint/no-floating-promises': ['error'],
                '@typescript-eslint/explicit-member-accessibility': ['error'],
                '@typescript-eslint/prefer-readonly': ['error'],
                '@typescript-eslint/explicit-function-return-type': ['error'],
                '@typescript-eslint/array-type': ['error', { default: 'array-simple' }],

                'import/no-unresolved': ['error'],
                'import/no-default-export': ['error'],
            },
        },
    ],
}