.eslintrc.js

module.exports = {
  extends: ['rollup', 'plugin:import/typescript'],
  overrides: [
    {
      files: ['*.ts'],
      parserOptions: {
        project: ['./tsconfig.eslint.json', './tsconfig.json'],
        tsconfigRootDir: __dirname
      },
      rules: { '@typescript-eslint/no-unnecessary-type-assertion': 'error' }
    }
  ],
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint'],
  rules: {
    '@typescript-eslint/consistent-type-assertions': 'error',
    '@typescript-eslint/consistent-type-definitions': 'error',
    '@typescript-eslint/member-ordering': 'error',
    '@typescript-eslint/no-inferrable-types': 'error',
    '@typescript-eslint/no-unnecessary-type-assertion': 'off',
    '@typescript-eslint/no-unused-vars': [
      'error',
      {
        args: 'after-used',
        ignoreRestSiblings: true,
        vars: 'local'
      }
    ],
    'import/extensions': [
      'error',
      'always',
      {
        js: 'never',
        jsx: 'never',
        ts: 'never',
        tsx: 'never'
      }
    ],
    'import/no-named-export': 'off',
    'import/no-namespace': 'off',
    'no-unused-vars': 'off',
    'prettier/prettier': [
      'error',
      {
        arrowParens: 'always',
        plugins: ['prettier-plugin-package'],
        printWidth: 100,
        singleQuote: true,
        trailingComma: 'none'
      }
    ]
  }
};