nx/packages/linter/src/generators/init/init.ts

import {
  addDependenciesToPackageJson,
  Tree,
  updateJson,
  writeJson,
} from '@nrwl/devkit';
import {
  nxVersion,
  eslintConfigPrettierVersion,
  eslintVersion,
  typescriptESLintVersion,
  tslintVersion,
} from '../../utils/versions';
import { Linter } from '../utils/linter';

export interface LinterInitOptions {
  linter: Linter;
}

const globalTsLintConfiguration = {
  rulesDirectory: ['node_modules/@nrwl/workspace/src/tslint'],
  linterOptions: {
    exclude: ['**/*'],
  },
  rules: {
    'arrow-return-shorthand': true,
    'callable-types': true,
    'class-name': true,
    deprecation: {
      severity: 'warn',
    },
    forin: true,
    'import-blacklist': [true, 'rxjs/Rx'],
    'interface-over-type-literal': true,
    'member-access': false,
    'member-ordering': [
      true,
      {
        order: [
          'static-field',
          'instance-field',
          'static-method',
          'instance-method',
        ],
      },
    ],
    'no-arg': true,
    'no-bitwise': true,
    'no-console': [true, 'debug', 'info', 'time', 'timeEnd', 'trace'],
    'no-construct': true,
    'no-debugger': true,
    'no-duplicate-super': true,
    'no-empty': false,
    'no-empty-interface': true,
    'no-eval': true,
    'no-inferrable-types': [true, 'ignore-params'],
    'no-misused-new': true,
    'no-non-null-assertion': true,
    'no-shadowed-variable': true,
    'no-string-literal': false,
    'no-string-throw': true,
    'no-switch-case-fall-through': true,
    'no-unnecessary-initializer': true,
    'no-unused-expression': true,
    'no-var-keyword': true,
    'object-literal-sort-keys': false,
    'prefer-const': true,
    radix: true,
    'triple-equals': [true, 'allow-null-check'],
    'unified-signatures': true,
    'variable-name': false,

    'nx-enforce-module-boundaries': [
      true,
      {
        enforceBuildableLibDependency: true,
        allow: [],
        depConstraints: [{ sourceTag: '*', onlyDependOnLibsWithTags: ['*'] }],
      },
    ],
  },
};

const globalEsLintConfiguration = {
  root: true,
  ignorePatterns: ['**/*'],
  plugins: ['@nrwl/nx'],
  /**
   * We leverage ESLint's "overrides" capability so that we can set up a root config which will support
   * all permutations of Nx workspaces across all frameworks, libraries and tools.
   *
   * The key point is that we need entirely different ESLint config to apply to different types of files,
   * but we still want to share common config where possible.
   */
  overrides: [
    /**
     * This configuration is intended to apply to all "source code" (but not
     * markup like HTML, or other custom file types like GraphQL)
     */
    {
      files: ['*.ts', '*.tsx', '*.js', '*.jsx'],
      rules: {
        '@nrwl/nx/enforce-module-boundaries': [
          'error',
          {
            enforceBuildableLibDependency: true,
            allow: [],
            depConstraints: [
              { sourceTag: '*', onlyDependOnLibsWithTags: ['*'] },
            ],
          },
        ],
      },
    },

    /**
     * This configuration is intended to apply to all TypeScript source files.
     * See the eslint-plugin-nx package for what is in the referenced shareable config.
     */
    {
      files: ['*.ts', '*.tsx'],
      extends: ['plugin:@nrwl/nx/typescript'],
      /**
       * TODO: Remove this usage of project at the root in a follow up PR (and migration),
       * it should be set in each project's config
       */
      parserOptions: { project: './tsconfig.*?.json' },
      /**
       * Having an empty rules object present makes it more obvious to the user where they would
       * extend things from if they needed to
       */
      rules: {},
    },

    /**
     * This configuration is intended to apply to all JavaScript source files.
     * See the eslint-plugin-nx package for what is in the referenced shareable config.
     */
    {
      files: ['*.js', '*.jsx'],
      extends: ['plugin:@nrwl/nx/javascript'],
      /**
       * Having an empty rules object present makes it more obvious to the user where they would
       * extend things from if they needed to
       */
      rules: {},
    },
  ],
};

function initTsLint(tree: Tree) {
  if (tree.exists('/tslint.json')) {
    return;
  }
  writeJson(tree, 'tslint.json', globalTsLintConfiguration);

  return addDependenciesToPackageJson(
    tree,

    {},
    {
      tslint: tslintVersion,
    }
  );
}

function initEsLint(tree: Tree) {
  if (tree.exists('/.eslintrc.json')) {
    return;
  }

  updateJson(tree, 'package.json', (json) => {
    json.dependencies = json.dependencies || {};

    delete json.dependencies['@nrwl/linter'];

    return json;
  });

  writeJson(tree, '.eslintrc.json', globalEsLintConfiguration);

  return addDependenciesToPackageJson(
    tree,

    {},
    {
      '@nrwl/linter': nxVersion,
      '@nrwl/eslint-plugin-nx': nxVersion,
      '@typescript-eslint/parser': typescriptESLintVersion,
      '@typescript-eslint/eslint-plugin': typescriptESLintVersion,
      eslint: eslintVersion,
      'eslint-config-prettier': eslintConfigPrettierVersion,
    }
  );
}

export function lintInitGenerator(tree: Tree, options: LinterInitOptions) {
  if (options.linter === Linter.TsLint) {
    return initTsLint(tree);
  } else if (options.linter === Linter.EsLint) {
    return initEsLint(tree);
  }
}