.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
    jest: true,
    mocha: true,
    node: true,
  },
  globals: {
    artifacts: false,
    assert: false,
    contract: false,
    web3: false,
  },
  extends: ['standard-with-typescript', 'prettier'],
  // This is needed to add configuration to rules with type information
  parser: '@typescript-eslint/parser',
  parserOptions: {
    // The 'tsconfig.packages.json' is needed to add not-compiled files to the project
    project: ['./tsconfig.json', './tsconfig.packages.json'],
  },
  ignorePatterns: ['dist/'],
  rules: {
    'no-console': 'off',
  },
  overrides: [
    {
      files: ['**/test/**/*.ts'],
      rules: {
        'no-unused-expressions': 'off',
        // chai assertions trigger this rule
        '@typescript-eslint/no-unused-expressions': 'off',
        '@typescript-eslint/no-non-null-assertion': 'off',
      },
    },
    {
      // otherwise it will raise an error in every JavaScript file
      files: ['*.ts'],
      rules: {
        '@typescript-eslint/prefer-ts-expect-error': 'off',
        // allow using '${val}' with numbers, bool and null types
        '@typescript-eslint/restrict-template-expressions': [
          'error',
          {
            allowNumber: true,
            allowBoolean: true,
            allowNullish: true,
            allowNullable: true,
          },
        ],
      },
    },
  ],
};