typescript-eslint · JoshuaKGoldberg · Dec 24, 2023 · Oct 15, 2023 · Oct 15, 2023 · Oct 15, 2023
diff --git a/docs/packages/TypeScript_ESTree.mdx b/docs/packages/TypeScript_ESTree.mdx
@@ -167,7 +167,7 @@ interface ParseAndGenerateServicesOptions extends ParseOptions {
    *
    * @see https://github.com/typescript-eslint/typescript-eslint/issues/6575
    */
-  EXPERIMENTAL_useProjectService?: boolean;
+  EXPERIMENTAL_useProjectService?: boolean | ProjectServiceOptions;
 
   /**
    * ***EXPERIMENTAL FLAG*** - Use this at your own risk.
@@ -270,6 +270,16 @@ interface ParseAndGenerateServicesOptions extends ParseOptions {
   };
 }
 
+/**
+ * Granular options to configure the project service.
+ */
+interface ProjectServiceOptions {
+  /**
+   * Globs of files to allow running with the default inferred project settings.
+   */
+  allowDefaultProjectForFiles?: string[];
+}
+
 interface ParserServices {
   program: ts.Program;
   esTreeNodeToTSNodeMap: WeakMap<TSESTree.Node, ts.Node | ts.Token>;

diff --git a/packages/eslint-plugin-tslint/tests/index.spec.ts b/packages/eslint-plugin-tslint/tests/index.spec.ts
@@ -166,71 +166,73 @@ ruleTester.run('tslint/config', rule, {
   ],
 });
 
-describe('tslint/error', () => {
-  function testOutput(code: string, config: ClassicConfig.Config): void {
-    const linter = new TSESLint.Linter();
-    linter.defineRule('tslint/config', rule);
-    linter.defineParser('@typescript-eslint/parser', parser);
-
-    expect(() => linter.verify(code, config)).toThrow(
-      'You have used a rule which requires parserServices to be generated. You must therefore provide a value for the "parserOptions.project" property for @typescript-eslint/parser.',
-    );
-  }
-
-  it('should error on missing project', () => {
-    testOutput('foo;', {
-      rules: {
-        'tslint/config': [2, tslintRulesConfig],
-      },
-      parser: '@typescript-eslint/parser',
+if (process.env.TYPESCRIPT_ESLINT_EXPERIMENTAL_TSSERVER !== 'true') {
+  describe('tslint/error', () => {
+    function testOutput(code: string, config: ClassicConfig.Config): void {
+      const linter = new TSESLint.Linter();
+      linter.defineRule('tslint/config', rule);
+      linter.defineParser('@typescript-eslint/parser', parser);
+
+      expect(() => linter.verify(code, config)).toThrow(
+        'You have used a rule which requires parserServices to be generated. You must therefore provide a value for the "parserOptions.project" property for @typescript-eslint/parser.',
+      );
+    }
+
+    it('should error on missing project', () => {
+      testOutput('foo;', {
+        rules: {
+          'tslint/config': [2, tslintRulesConfig],
+        },
+        parser: '@typescript-eslint/parser',
+      });
     });
-  });
 
-  it('should error on default parser', () => {
-    testOutput('foo;', {
-      parserOptions: {
-        project: TEST_PROJECT_PATH,
-      },
-      rules: {
-        'tslint/config': [2, tslintRulesConfig],
-      },
+    it('should error on default parser', () => {
+      testOutput('foo;', {
+        parserOptions: {
+          project: TEST_PROJECT_PATH,
+        },
+        rules: {
+          'tslint/config': [2, tslintRulesConfig],
+        },
+      });
     });
-  });
 
-  it('should not crash if there are no tslint rules specified', () => {
-    const linter = new TSESLint.Linter();
-    jest.spyOn(console, 'warn').mockImplementation();
-    linter.defineRule('tslint/config', rule);
-    linter.defineParser('@typescript-eslint/parser', parser);
-
-    const filePath = path.resolve(
-      __dirname,
-      'fixtures',
-      'test-project',
-      'extra.ts',
-    );
-
-    expect(() =>
-      linter.verify(
-        'foo;',
-        {
-          parserOptions: {
-            project: TEST_PROJECT_PATH,
-          },
-          rules: {
-            'tslint/config': [2, {}],
+    it('should not crash if there are no tslint rules specified', () => {
+      const linter = new TSESLint.Linter();
+      jest.spyOn(console, 'warn').mockImplementation();
+      linter.defineRule('tslint/config', rule);
+      linter.defineParser('@typescript-eslint/parser', parser);
+
+      const filePath = path.resolve(
+        __dirname,
+        'fixtures',
+        'test-project',
+        'extra.ts',
+      );
+
+      expect(() =>
+        linter.verify(
+          'foo;',
+          {
+            parserOptions: {
+              project: TEST_PROJECT_PATH,
+            },
+            rules: {
+              'tslint/config': [2, {}],
+            },
+            parser: '@typescript-eslint/parser',
           },
-          parser: '@typescript-eslint/parser',
-        },
-        filePath,
-      ),
-    ).not.toThrow();
-
-    expect(console.warn).toHaveBeenCalledWith(
-      expect.stringContaining(
-        `Tried to lint ${filePath} but found no valid, enabled rules for this file type and file path in the resolved configuration.`,
-      ),
-    );
-    jest.resetAllMocks();
+          filePath,
+        ),
+      ).not.toThrow();
+
+      expect(console.warn).toHaveBeenCalledWith(
+        expect.stringContaining(
+          `Tried to lint ${filePath} but found no valid, enabled rules for this file type and file path in the resolved configuration.`,
+        ),
+      );
+      jest.resetAllMocks();
+    });
   });
-});
+}
diff --git a/packages/typescript-estree/package.json b/packages/typescript-estree/package.json
@@ -57,6 +57,7 @@
     "debug": "^4.3.4",
     "globby": "^11.1.0",
     "is-glob": "^4.0.3",
+    "minimatch": "9.0.3",
     "semver": "^7.5.4",
     "ts-api-utils": "^1.0.1"
   },

diff --git a/packages/typescript-estree/src/create-program/createProjectService.ts b/packages/typescript-estree/src/create-program/createProjectService.ts
@@ -1,6 +1,8 @@
+/* eslint-disable @typescript-eslint/no-empty-function -- for TypeScript APIs*/
 import type * as ts from 'typescript/lib/tsserverlibrary';
 
-// eslint-disable-next-line @typescript-eslint/no-empty-function
+import type { ProjectServiceOptions } from '../parser-options';
+
 const doNothing = (): void => {};
 
 const createStubFileWatcher = (): ts.FileWatcher => ({
@@ -9,9 +11,15 @@ const createStubFileWatcher = (): ts.FileWatcher => ({
 
 export type TypeScriptProjectService = ts.server.ProjectService;
 
+export interface ProjectServiceSettings {
+  allowDefaultProjectForFiles: string[] | undefined;
+  service: TypeScriptProjectService;
+}
+
 export function createProjectService(
-  jsDocParsingMode?: ts.JSDocParsingMode,
-): TypeScriptProjectService {
+  options: boolean | ProjectServiceOptions | undefined,
+  jsDocParsingMode: ts.JSDocParsingMode | undefined,
+): ProjectServiceSettings {
   // We import this lazily to avoid its cost for users who don't use the service
   // TODO: Once we drop support for TS<5.3 we can import from "typescript" directly
   const tsserver = require('typescript/lib/tsserverlibrary') as typeof ts;
@@ -30,7 +38,7 @@ export function createProjectService(
     watchFile: createStubFileWatcher,
   };
 
-  return new tsserver.server.ProjectService({
+  const service = new tsserver.server.ProjectService({
     host: system,
     cancellationToken: { isCancellationRequested: (): boolean => false },
     useSingleInferredProject: false,
@@ -49,4 +57,12 @@ export function createProjectService(
     session: undefined,
     jsDocParsingMode,
   });
+
+  return {
+    allowDefaultProjectForFiles:
+      typeof options === 'object'
+        ? options.allowDefaultProjectForFiles
+        : undefined,
+    service,
+  };
 }
diff --git a/packages/typescript-estree/src/parseSettings/createParseSettings.ts b/packages/typescript-estree/src/parseSettings/createParseSettings.ts
@@ -1,7 +1,7 @@
 import debug from 'debug';
 import * as ts from 'typescript';
 
-import type { TypeScriptProjectService } from '../create-program/createProjectService';
+import type { ProjectServiceSettings } from '../create-program/createProjectService';
 import { createProjectService } from '../create-program/createProjectService';
 import { ensureAbsolutePath } from '../create-program/shared';
 import type { TSESTreeOptions } from '../parser-options';
@@ -21,7 +21,7 @@ const log = debug(
 );
 
 let TSCONFIG_MATCH_CACHE: ExpiringCache<string, string> | null;
-let TSSERVER_PROJECT_SERVICE: TypeScriptProjectService | null = null;
+let TSSERVER_PROJECT_SERVICE: ProjectServiceSettings | null = null;
 
 // NOTE - we intentionally use "unnecessary" `?.` here because in TS<5.3 this enum doesn't exist
 // This object exists so we can centralize these for tracking and so we don't proliferate these across the file
@@ -80,11 +80,14 @@ export function createParseSettings(
     errorOnTypeScriptSyntacticAndSemanticIssues: false,
     errorOnUnknownASTType: options.errorOnUnknownASTType === true,
     EXPERIMENTAL_projectService:
-      (options.EXPERIMENTAL_useProjectService === true &&
+      (options.EXPERIMENTAL_useProjectService &&
         process.env.TYPESCRIPT_ESLINT_EXPERIMENTAL_TSSERVER !== 'false') ||
       (process.env.TYPESCRIPT_ESLINT_EXPERIMENTAL_TSSERVER === 'true' &&
         options.EXPERIMENTAL_useProjectService !== false)
-        ? (TSSERVER_PROJECT_SERVICE ??= createProjectService(jsDocParsingMode))
+        ? (TSSERVER_PROJECT_SERVICE ??= createProjectService(
+            options.EXPERIMENTAL_useProjectService,
+            jsDocParsingMode,
+          ))
         : undefined,
     EXPERIMENTAL_useSourceOfProjectReferenceRedirect:
       options.EXPERIMENTAL_useSourceOfProjectReferenceRedirect === true,

diff --git a/packages/typescript-estree/src/parseSettings/index.ts b/packages/typescript-estree/src/parseSettings/index.ts
@@ -1,6 +1,6 @@
 import type * as ts from 'typescript';
-import type * as tsserverlibrary from 'typescript/lib/tsserverlibrary';
 
+import type { ProjectServiceSettings } from '../create-program/createProjectService';
 import type { CanonicalPath } from '../create-program/shared';
 import type { TSESTree } from '../ts-estree';
 import type { CacheLike } from './ExpiringCache';
@@ -67,9 +67,7 @@ export interface MutableParseSettings {
   /**
    * Experimental: TypeScript server to power program creation.
    */
-  EXPERIMENTAL_projectService:
-    | tsserverlibrary.server.ProjectService
-    | undefined;
+  EXPERIMENTAL_projectService: ProjectServiceSettings | undefined;
 
   /**
    * Whether TS should use the source files for referenced projects instead of the compiled .d.ts files.

diff --git a/packages/typescript-estree/src/parser-options.ts b/packages/typescript-estree/src/parser-options.ts
@@ -101,6 +101,16 @@ interface ParseOptions {
   suppressDeprecatedPropertyWarnings?: boolean;
 }
 
+/**
+ * Granular options to configure the project service.
+ */
+export interface ProjectServiceOptions {
+  /**
+   * Globs of files to allow running with the default inferred project settings.
+   */
+  allowDefaultProjectForFiles?: string[];
+}
+
 interface ParseAndGenerateServicesOptions extends ParseOptions {
   /**
    * Causes the parser to error if the TypeScript compiler returns any unexpected syntax/semantic errors.
@@ -114,7 +124,7 @@ interface ParseAndGenerateServicesOptions extends ParseOptions {
    *
    * @see https://github.com/typescript-eslint/typescript-eslint/issues/6575
    */
-  EXPERIMENTAL_useProjectService?: boolean;
+  EXPERIMENTAL_useProjectService?: boolean | ProjectServiceOptions;
 
   /**
    * ***EXPERIMENTAL FLAG*** - Use this at your own risk.

diff --git a/packages/typescript-estree/src/parser.ts b/packages/typescript-estree/src/parser.ts
@@ -53,6 +53,7 @@ function getProgramAndAST(
     const fromProjectService = useProgramFromProjectService(
       parseSettings.EXPERIMENTAL_projectService,
       parseSettings,
+      hasFullTypeInformation,
     );
     if (fromProjectService) {
       return fromProjectService;

diff --git a/packages/typescript-estree/src/useProgramFromProjectService.ts b/packages/typescript-estree/src/useProgramFromProjectService.ts
@@ -1,26 +1,44 @@
-import path from 'path';
-import type { server } from 'typescript/lib/tsserverlibrary';
+import { minimatch } from 'minimatch';
 
 import { createProjectProgram } from './create-program/createProjectProgram';
-import { type ASTAndDefiniteProgram } from './create-program/shared';
+import type { ProjectServiceSettings } from './create-program/createProjectService';
+import {
+  type ASTAndDefiniteProgram,
+  ensureAbsolutePath,
+  getCanonicalFileName,
+} from './create-program/shared';
 import type { MutableParseSettings } from './parseSettings';
 
 export function useProgramFromProjectService(
-  projectService: server.ProjectService,
+  { allowDefaultProjectForFiles, service }: ProjectServiceSettings,
   parseSettings: Readonly<MutableParseSettings>,
+  hasFullTypeInformation: boolean,
 ): ASTAndDefiniteProgram | undefined {
-  const opened = projectService.openClientFile(
-    absolutify(parseSettings.filePath),
+  const filePath = getCanonicalFileName(parseSettings.filePath);
+
+  const opened = service.openClientFile(
+    ensureAbsolutePath(filePath, service.host.getCurrentDirectory()),
     parseSettings.codeFullText,
     /* scriptKind */ undefined,
     parseSettings.tsconfigRootDir,
   );
-  if (!opened.configFileName) {
-    return undefined;
+
+  if (hasFullTypeInformation) {
+    if (opened.configFileName) {
+      if (filePathMatchedBy(filePath, allowDefaultProjectForFiles)) {
+        throw new Error(
+          `${filePath} was included by allowDefaultProjectForFiles but also was found in the project service. Consider removing it from allowDefaultProjectForFiles.`,
+        );
+      }
+    } else if (!filePathMatchedBy(filePath, allowDefaultProjectForFiles)) {
+      throw new Error(
+        `${filePath} was not found by the project service. Consider either including it in the tsconfig.json or including it in allowDefaultProjectForFiles.`,
+      );
+    }
   }
 
-  const scriptInfo = projectService.getScriptInfo(parseSettings.filePath);
-  const program = projectService
+  const scriptInfo = service.getScriptInfo(filePath);
+  const program = service
     .getDefaultProjectForFile(scriptInfo!.fileName, true)!
     .getLanguageService(/*ensureSynchronized*/ true)
     .getProgram();
@@ -30,10 +48,13 @@ export function useProgramFromProjectService(
   }
 
   return createProjectProgram(parseSettings, [program]);
+}
 
-  function absolutify(filePath: string): string {
-    return path.isAbsolute(filePath)
-      ? filePath
-      : path.join(projectService.host.getCurrentDirectory(), filePath);
-  }
+function filePathMatchedBy(
+  filePath: string,
+  allowDefaultProjectForFiles: string[] | undefined,
+): boolean {
+  return !!allowDefaultProjectForFiles?.some(pattern =>
+    minimatch(filePath, pattern),
+  );
 }