feat(core): enable linter on root projects (#13347)

e2e/linter/src/linter.test.ts

@@ -438,6 +438,78 @@ export function tslibC(): string {
       );
     });
   });
+
+  describe('Root projects migration', () => {
+    afterEach(() => cleanupProject());
+
+    it('should set root project config to app and e2e app and migrate when another lib is added', () => {
+      const myapp = uniq('myapp');
+      const mylib = uniq('mylib');
+
+      newProject();
+      runCLI(`generate @nrwl/react:app ${myapp} --rootProject=true`);
+
+      let rootEslint = readJson('.eslintrc.json');
+      let e2eEslint = readJson('e2e/.eslintrc.json');
+      expect(() => checkFilesExist(`.eslintrc.${myapp}.json`)).toThrow();
+
+      // should directly refer to nx plugin
+      expect(rootEslint.plugins).toEqual(['@nrwl/nx']);
+      expect(e2eEslint.plugins).toEqual(['@nrwl/nx']);
+      // should only extend framework plugin
+      expect(rootEslint.extends).toEqual(['plugin:@nrwl/nx/react']);
+      expect(e2eEslint.extends).toEqual(['plugin:cypress/recommended']);
+      // should have plugin extends
+      expect(rootEslint.overrides[0].extends).toEqual([
+        'plugin:@nrwl/nx/typescript',
+      ]);
+      expect(rootEslint.overrides[1].extends).toEqual([
+        'plugin:@nrwl/nx/javascript',
+      ]);
+      expect(e2eEslint.overrides[0].extends).toEqual([
+        'plugin:@nrwl/nx/typescript',
+      ]);
+      expect(e2eEslint.overrides[1].extends).toEqual([
+        'plugin:@nrwl/nx/javascript',
+      ]);
+
+      console.log(JSON.stringify(rootEslint, null, 2));
+      console.log(JSON.stringify(e2eEslint, null, 2));
+
+      runCLI(`generate @nrwl/react:lib ${mylib}`);
+      // should add new tslint
+      expect(() => checkFilesExist(`.eslintrc.${myapp}.json`)).not.toThrow();
+      const appEslint = readJson(`.eslintrc.${myapp}.json`);
+      rootEslint = readJson('.eslintrc.json');
+      e2eEslint = readJson('e2e/.eslintrc.json');
+      const libEslint = readJson(`libs/${mylib}/.eslintrc.json`);
+
+      // should directly refer to nx plugin only in the root
+      expect(rootEslint.plugins).toEqual(['@nrwl/nx']);
+      expect(appEslint.plugins).toBeUndefined();
+      expect(e2eEslint.plugins).toBeUndefined();
+      // should extend framework plugin and root config
+      expect(appEslint.extends).toEqual([
+        'plugin:@nrwl/nx/react',
+        './.eslintrc.json',
+      ]);
+      expect(e2eEslint.extends).toEqual([
+        'plugin:cypress/recommended',
+        '../.eslintrc.json',
+      ]);
+      expect(libEslint.extends).toEqual([
+        'plugin:@nrwl/nx/react',
+        '../../.eslintrc.json',
+      ]);
+      // should have no plugin extends
+      expect(appEslint.overrides[0].extends).toBeUndefined();
+      expect(appEslint.overrides[1].extends).toBeUndefined();
+      expect(e2eEslint.overrides[0].extends).toBeUndefined();
+      expect(e2eEslint.overrides[1].extends).toBeUndefined();
+      expect(libEslint.overrides[1].extends).toBeUndefined();
+      expect(libEslint.overrides[1].extends).toBeUndefined();
+    });
+  });
 });
 
 /**

packages/cypress/src/generators/cypress-project/cypress-project.ts

@@ -19,6 +19,10 @@ import {
 import { Linter, lintProjectGenerator } from '@nrwl/linter';
 import { runTasksInSerial } from '@nrwl/workspace/src/utilities/run-tasks-in-serial';
 import { getRelativePathToRootTsConfig } from '@nrwl/workspace/src/utilities/typescript';
+import {
+  globalJavaScriptOverrides,
+  globalTypeScriptOverrides,
+} from '@nrwl/linter/src/generators/init/global-eslint-config';
 
 import { join } from 'path';
 import { installedCypressVersion } from '../../utils/cypress-version';
@@ -177,6 +181,7 @@ export async function addLinter(host: Tree, options: CypressProjectSchema) {
     ],
     setParserOptionsProject: options.setParserOptionsProject,
     skipPackageJson: options.skipPackageJson,
+    rootProject: options.rootProject,
   });
 
   if (!options.linter || options.linter !== Linter.EsLint) {
@@ -192,8 +197,16 @@ export async function addLinter(host: Tree, options: CypressProjectSchema) {
     : () => {};
 
   updateJson(host, join(options.projectRoot, '.eslintrc.json'), (json) => {
-    json.extends = ['plugin:cypress/recommended', ...json.extends];
+    if (options.rootProject) {
+      json.plugins = ['@nrwl/nx'];
+      json.extends = ['plugin:cypress/recommended'];
+    } else {
+      json.extends = ['plugin:cypress/recommended', ...json.extends];
+    }
     json.overrides = [
+      ...(options.rootProject
+        ? [globalTypeScriptOverrides, globalJavaScriptOverrides]
+        : []),
       /**
        * In order to ensure maximum efficiency when typescript-eslint generates TypeScript Programs
        * behind the scenes during lint runs, we need to make sure the project is configured to use its

packages/linter/package.json

@@ -30,7 +30,8 @@
   "builders": "./executors.json",
   "schematics": "./generators.json",
   "peerDependencies": {
-    "eslint": "^8.0.0"
+    "eslint": "^8.0.0",
+    "js-yaml": "4.1.0"
   },
   "dependencies": {
     "@nrwl/devkit": "file:../devkit",

packages/linter/src/generators/init/global-eslint-config.ts

@@ -0,0 +1,80 @@
+import { ESLint, Linter as LinterType } from 'eslint';
+
+/**
+ * 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.
+ */
+export const globalTypeScriptOverrides = {
+  files: ['*.ts', '*.tsx'],
+  extends: ['plugin:@nrwl/nx/typescript'],
+  /**
+   * 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.
+ */
+export const globalJavaScriptOverrides = {
+  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: {},
+};
+
+/**
+ * This configuration is intended to apply to all "source code" (but not
+ * markup like HTML, or other custom file types like GraphQL)
+ */
+export const moduleBoundariesOverride = {
+  files: ['*.ts', '*.tsx', '*.js', '*.jsx'],
+  rules: {
+    '@nrwl/nx/enforce-module-boundaries': [
+      'error',
+      {
+        enforceBuildableLibDependency: true,
+        allow: [],
+        depConstraints: [{ sourceTag: '*', onlyDependOnLibsWithTags: ['*'] }],
+      },
+    ],
+  } as LinterType.RulesRecord,
+};
+
+export const getGlobalEsLintConfiguration = (
+  unitTestRunner?: string,
+  rootProject?: boolean
+) => {
+  const config: ESLint.ConfigData = {
+    root: true,
+    ignorePatterns: rootProject ? ['!**/*'] : ['**/*'],
+    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: [
+      ...(rootProject ? [] : [moduleBoundariesOverride]),
+      globalTypeScriptOverrides,
+      globalJavaScriptOverrides,
+    ],
+  };
+  if (unitTestRunner === 'jest') {
+    config.overrides.push({
+      files: ['*.spec.ts', '*.spec.tsx', '*.spec.js', '*.spec.jsx'],
+      env: {
+        jest: true,
+      },
+      rules: {},
+    });
+  }
+  return config;
+};

packages/linter/src/generators/init/init-migration.ts

@@ -0,0 +1,116 @@
+import {
+  joinPathFragments,
+  offsetFromRoot,
+  ProjectConfiguration,
+  TargetConfiguration,
+  Tree,
+  updateJson,
+  updateProjectConfiguration,
+  writeJson,
+} from '@nrwl/devkit';
+import { basename, dirname } from 'path';
+import { findEslintFile } from '../utils/eslint-file';
+import { getGlobalEsLintConfiguration } from './global-eslint-config';
+
+const FILE_EXTENSION_REGEX = /(?<!(^|\/))(\.[^/.]+)$/;
+
+export function migrateConfigToMonorepoStyle(
+  projects: ProjectConfiguration[],
+  tree: Tree,
+  unitTestRunner: string
+): void {
+  // copy the root's .eslintrc.json to new name
+  const rootProject = projects.find((p) => p.root === '.');
+  const eslintPath =
+    rootProject.targets?.lint?.options?.eslintConfig || findEslintFile(tree);
+  const pathSegments = eslintPath.split(FILE_EXTENSION_REGEX).filter(Boolean);
+  const rootProjEslintPath =
+    pathSegments.length > 1
+      ? pathSegments.join(`.${rootProject.name}`)
+      : `.${rootProject.name}.${rootProject.name}`;
+  tree.write(rootProjEslintPath, tree.read(eslintPath));
+
+  // update root project's configuration
+  const lintTarget = findLintTarget(rootProject);
+  lintTarget.options.eslintConfig = rootProjEslintPath;
+  updateProjectConfiguration(tree, rootProject.name, rootProject);
+
+  // replace root eslint with default global
+  tree.delete(eslintPath);
+  writeJson(
+    tree,
+    '.eslintrc.json',
+    getGlobalEsLintConfiguration(unitTestRunner)
+  );
+
+  // update extens in all projects' eslint configs
+  projects.forEach((project) => {
+    const lintTarget = findLintTarget(project);
+    if (lintTarget) {
+      const projectEslintPath = joinPathFragments(
+        project.root,
+        lintTarget.options.eslintConfig || findEslintFile(tree, project.root)
+      );
+      migrateEslintFile(projectEslintPath, tree);
+    }
+  });
+}
+
+export function findLintTarget(
+  project: ProjectConfiguration
+): TargetConfiguration {
+  return Object.entries(project.targets).find(
+    ([name, target]) =>
+      name === 'lint' || target.executor === '@nrwl/linter:eslint'
+  )?.[1];
+}
+
+function migrateEslintFile(projectEslintPath: string, tree: Tree) {
+  if (projectEslintPath.endsWith('.json')) {
+    updateJson(tree, projectEslintPath, (json) => {
+      // we have a new root now
+      delete json.root;
+      // remove nrwl/nx plugins
+      if (json.plugins) {
+        json.plugins = json.plugins.filter((p) => p !== '@nrwl/nx');
+        if (json.plugins.length === 0) {
+          delete json.plugins;
+        }
+      }
+      // add extends
+      json.extends = json.extends || [];
+      const pathToRootConfig = `${offsetFromRoot(
+        dirname(projectEslintPath)
+      )}.eslintrc.json`;
+      if (json.extends.indexOf(pathToRootConfig) === -1) {
+        json.extends.push(pathToRootConfig);
+      }
+      // cleanup overrides
+      if (json.overrides) {
+        json.overrides.forEach((override) => {
+          if (override.extends) {
+            override.extends = override.extends.filter(
+              (ext) =>
+                ext !== 'plugin:@nrwl/nx/typescript' &&
+                ext !== 'plugin:@nrwl/nx/javascript'
+            );
+            if (override.extends.length === 0) {
+              delete override.extends;
+            }
+          }
+        });
+      }
+      return json;
+    });
+    return;
+  }
+  if (
+    projectEslintPath.endsWith('.yml') ||
+    projectEslintPath.endsWith('.yaml')
+  ) {
+    console.warn('YAML eslint config is not supported yet for migration');
+  }
+  if (projectEslintPath.endsWith('.js') || projectEslintPath.endsWith('.cjs')) {
+    console.warn('YAML eslint config is not supported yet for migration');
+  }
+}

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

@@ -16,88 +16,15 @@ import {
 
 import { Linter } from '../utils/linter';
 import { findEslintFile } from '../utils/eslint-file';
-import { ESLint } from 'eslint';
+import { getGlobalEsLintConfiguration } from './global-eslint-config';
 
 export interface LinterInitOptions {
   linter?: Linter;
   unitTestRunner?: string;
   skipPackageJson?: boolean;
+  rootProject?: boolean;
 }
 
-const getGlobalEsLintConfiguration = (unitTestRunner?: string) => {
-  const config: ESLint.ConfigData = {
-    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'],
-        /**
-         * 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: {},
-      },
-    ],
-  };
-  if (unitTestRunner === 'jest') {
-    config.overrides.push({
-      files: ['*.spec.ts', '*.spec.tsx', '*.spec.js', '*.spec.jsx'],
-      env: {
-        jest: true,
-      },
-      rules: {},
-    });
-  }
-  return config;
-};
-
 function addTargetDefaults(tree: Tree) {
   const workspaceConfiguration = readWorkspaceConfiguration(tree);
 
@@ -133,7 +60,7 @@ function initEsLint(tree: Tree, options: LinterInitOptions): GeneratorCallback {
   writeJson(
     tree,
     '.eslintrc.json',
-    getGlobalEsLintConfiguration(options.unitTestRunner)
+    getGlobalEsLintConfiguration(options.unitTestRunner, options.rootProject)
   );
   addTargetDefaults(tree);
 

packages/linter/src/generators/lint-project/lint-project.ts

@@ -11,6 +11,11 @@ import { Linter } from '../utils/linter';
 import { findEslintFile } from '../utils/eslint-file';
 import { join } from 'path';
 import { lintInitGenerator } from '../init/init';
+import {
+  findLintTarget,
+  migrateConfigToMonorepoStyle,
+} from '../init/init-migration';
+import { readWorkspace } from 'nx/src/generators/utils/project-configuration';
 
 interface LintProjectOptions {
   project: string;
@@ -21,6 +26,7 @@ interface LintProjectOptions {
   setParserOptionsProject?: boolean;
   skipPackageJson?: boolean;
   unitTestRunner?: string;
+  rootProject?: boolean;
 }
 
 function createEsLintConfiguration(
@@ -74,6 +80,15 @@ function createEsLintConfiguration(
   });
 }
 
+export function mapLintPattern(
+  projectRoot: string,
+  extension: string,
+  rootProject?: boolean
+) {
+  const infix = rootProject ? 'src/' : '';
+  return `${projectRoot}/${infix}**/*.${extension}`;
+}
+
 export async function lintProjectGenerator(
   tree: Tree,
   options: LintProjectOptions
@@ -82,6 +97,7 @@ export async function lintProjectGenerator(
     linter: options.linter,
     unitTestRunner: options.unitTestRunner,
     skipPackageJson: options.skipPackageJson,
+    rootProject: options.rootProject,
   });
   const projectConfig = readProjectConfiguration(tree, options.project);
 
@@ -92,11 +108,38 @@ export async function lintProjectGenerator(
       lintFilePatterns: options.eslintFilePatterns,
     },
   };
-  createEsLintConfiguration(
-    tree,
-    projectConfig,
-    options.setParserOptionsProject
-  );
+
+  // we are adding new project which is not the root project or
+  // companion e2e app so we should check if migration to
+  // monorepo style is needed
+  if (!options.rootProject) {
+    const projects = readWorkspace(tree).projects;
+    if (isMigrationToMonorepoNeeded(projects, tree)) {
+      // we only migrate project configurations that have been created
+      const filteredProjects = [];
+      Object.entries(projects).forEach(([name, project]) => {
+        if (name !== options.project) {
+          filteredProjects.push(project);
+        }
+      });
+      migrateConfigToMonorepoStyle(
+        filteredProjects,
+        tree,
+        options.unitTestRunner
+      );
+    }
+  }
+
+  // our root `.eslintrc` is already the project config, so we should not override it
+  // additionally, the companion e2e app would have `rootProject: true`
+  // so we need to check for the root path as well
+  if (!options.rootProject || projectConfig.root !== '.') {
+    createEsLintConfiguration(
+      tree,
+      projectConfig,
+      options.setParserOptionsProject
+    );
+  }
 
   updateProjectConfiguration(tree, options.project, projectConfig);
 
@@ -106,3 +149,40 @@ export async function lintProjectGenerator(
 
   return installTask;
 }
+
+/**
+ * Detect based on the state of lint target configuration of the root project
+ * if we should migrate eslint configs to monorepo style
+ *
+ * @param tree
+ * @returns
+ */
+function isMigrationToMonorepoNeeded(
+  projects: Record<string, ProjectConfiguration>,
+  tree: Tree
+): boolean {
+  const configs = Object.values(projects);
+  if (configs.length === 1) {
+    return false;
+  }
+  // get root project
+  const rootProject = configs.find((p) => p.root === '.');
+  if (!rootProject || !rootProject.targets) {
+    return false;
+  }
+  // find if root project has lint target
+  const lintTarget = findLintTarget(rootProject);
+  if (!lintTarget) {
+    return false;
+  }
+  // if there is no override for `eslintConfig` we should migrate
+  if (!lintTarget.options.eslintConfig) {
+    return true;
+  }
+  // check if target has `eslintConfig` override and if it's not pointing to the source .eslintrc
+  const rootEslintrc = findEslintFile(tree);
+  return (
+    lintTarget.options.eslintConfig === rootEslintrc ||
+    lintTarget.options.eslintConfig === `./${rootEslintrc}`
+  );
+}

packages/linter/src/generators/utils/eslint-file.ts

@@ -1,4 +1,4 @@
-import type { Tree } from '@nrwl/devkit';
+import { joinPathFragments, Tree } from '@nrwl/devkit';
 
 export const eslintConfigFileWhitelist = [
   '.eslintrc',
@@ -9,9 +9,9 @@ export const eslintConfigFileWhitelist = [
   '.eslintrc.json',
 ];
 
-export function findEslintFile(tree: Tree): string | null {
+export function findEslintFile(tree: Tree, projectRoot = ''): string | null {
   for (const file of eslintConfigFileWhitelist) {
-    if (tree.exists(file)) {
+    if (tree.exists(joinPathFragments(projectRoot, file))) {
       return file;
     }
   }

packages/react/src/generators/application/application.ts

@@ -1,5 +1,5 @@
 import {
-  createReactEslintJson,
+  extendReactEslintJson,
   extraEslintDependencies,
 } from '../../utils/lint';
 import { NormalizedSchema, Schema } from './schema';
@@ -27,6 +27,7 @@ import { Linter, lintProjectGenerator } from '@nrwl/linter';
 import { swcCoreVersion } from '@nrwl/js/src/utils/versions';
 import { swcLoaderVersion } from '@nrwl/webpack/src/utils/versions';
 import { viteConfigurationGenerator, vitestGenerator } from '@nrwl/vite';
+import { mapLintPattern } from '@nrwl/linter/src/generators/lint-project/lint-project';
 
 async function addLinting(host: Tree, options: NormalizedSchema) {
   const tasks: GeneratorCallback[] = [];
@@ -38,20 +39,22 @@ async function addLinting(host: Tree, options: NormalizedSchema) {
         joinPathFragments(options.appProjectRoot, 'tsconfig.app.json'),
       ],
       unitTestRunner: options.unitTestRunner,
-      eslintFilePatterns: [`${options.appProjectRoot}/**/*.{ts,tsx,js,jsx}`],
+      eslintFilePatterns: [
+        mapLintPattern(
+          options.appProjectRoot,
+          '{ts,tsx,js,jsx}',
+          options.rootProject
+        ),
+      ],
       skipFormat: true,
+      rootProject: options.rootProject,
     });
     tasks.push(lintTask);
 
-    const reactEslintJson = createReactEslintJson(
-      options.appProjectRoot,
-      options.setParserOptionsProject
-    );
-
     updateJson(
       host,
       joinPathFragments(options.appProjectRoot, '.eslintrc.json'),
-      () => reactEslintJson
+      extendReactEslintJson
     );
 
     const installTask = await addDependenciesToPackageJson(

packages/react/src/generators/application/lib/add-cypress.ts

@@ -12,5 +12,6 @@ export async function addCypress(host: Tree, options: NormalizedSchema) {
     name: options.e2eProjectName,
     directory: options.directory,
     project: options.projectName,
+    rootProject: options.rootProject,
   });
 }

packages/react/src/utils/lint.ts

@@ -17,6 +17,15 @@ export const extraEslintDependencies = {
   },
 };
 
+export const extendReactEslintJson = (json: Linter.Config) => {
+  const { extends: pluginExtends, ...config } = json;
+
+  return {
+    extends: ['plugin:@nrwl/nx/react', ...(pluginExtends || [])],
+    ...config,
+  };
+};
+
 export const createReactEslintJson = (
   projectRoot: string,
   setParserOptionsProject: boolean

packages/workspace/src/generators/preset/preset.ts

@@ -67,7 +67,7 @@ async function createPreset(tree: Tree, options: Schema) {
     await reactApplicationGenerator(tree, {
       name: options.name,
       style: options.style,
-      linter: 'none',
+      linter: options.linter,
       unitTestRunner: 'none',
       standaloneConfig: options.standaloneConfig,
       rootProject: true,

tsconfig.base.json

@@ -36,6 +36,7 @@
       "@nrwl/js": ["packages/js/src"],
       "@nrwl/js/*": ["packages/js/*"],
       "@nrwl/linter": ["packages/linter"],
+      "@nrwl/linter/*": ["packages/linter/*"],
       "@nrwl/nest": ["packages/nest"],
       "@nrwl/next": ["packages/next"],
       "@nrwl/node": ["packages/node"],