typescript-eslint · JoshuaKGoldberg · Apr 15, 2024 · Apr 4, 2024 · Apr 15, 2024
diff --git a/docs/packages/TypeScript_ESTree.mdx b/docs/packages/TypeScript_ESTree.mdx
@@ -235,12 +235,6 @@ interface ParseAndGenerateServicesOptions extends ParseOptions {
    */
   programs?: Program[];
 
-  /**
-   * @deprecated - this flag will be removed in the next major.
-   * Do not rely on the behavior provided by this flag.
-   */
-  DEPRECATED__createDefaultProgram?: boolean;
-
   /**
    * ESLint (and therefore typescript-eslint) is used in both "single run"/one-time contexts,
    * such as an ESLint CLI invocation, and long-running sessions (such as continuous feedback

diff --git a/packages/typescript-estree/src/create-program/createDefaultProgram.ts b/packages/typescript-estree/src/create-program/createDefaultProgram.ts
diff --git a/packages/typescript-estree/src/create-program/createProjectProgram.ts b/packages/typescript-estree/src/create-program/createProjectProgram.ts
@@ -28,16 +28,15 @@ const DEFAULT_EXTRA_FILE_EXTENSIONS = [
 function createProjectProgram(
   parseSettings: ParseSettings,
   programsForProjects: readonly ts.Program[],
-): ASTAndDefiniteProgram | undefined {
+): ASTAndDefiniteProgram {
   log('Creating project program for: %s', parseSettings.filePath);
 
   const astAndProgram = firstDefined(programsForProjects, currentProgram =>
     getAstFromProgram(currentProgram, parseSettings.filePath),
   );
 
-  // The file was either matched within the tsconfig, or we allow creating a default program
-  // eslint-disable-next-line deprecation/deprecation -- will be cleaned up with the next major
-  if (astAndProgram || parseSettings.DEPRECATED__createDefaultProgram) {
+  // The file was matched within the tsconfig
+  if (astAndProgram) {
     return astAndProgram;
   }
 

diff --git a/packages/typescript-estree/src/parseSettings/createParseSettings.ts b/packages/typescript-estree/src/parseSettings/createParseSettings.ts
@@ -68,9 +68,6 @@ export function createParseSettings(
     codeFullText,
     comment: options.comment === true,
     comments: [],
-    DEPRECATED__createDefaultProgram:
-      // eslint-disable-next-line deprecation/deprecation -- will be cleaned up with the next major
-      options.DEPRECATED__createDefaultProgram === true,
     debugLevel:
       options.debugLevel === true
         ? new Set(['typescript-eslint'])

diff --git a/packages/typescript-estree/src/parseSettings/index.ts b/packages/typescript-estree/src/parseSettings/index.ts
@@ -47,13 +47,6 @@ export interface MutableParseSettings {
    */
   comments: TSESTree.Comment[];
 
-  /**
-   * @deprecated
-   * This is a legacy option that comes with severe performance penalties.
-   * Please do not use it.
-   */
-  DEPRECATED__createDefaultProgram: boolean;
-
   /**
    * Which debug areas should be logged.
    */

diff --git a/packages/typescript-estree/src/parser-options.ts b/packages/typescript-estree/src/parser-options.ts
@@ -192,12 +192,6 @@ interface ParseAndGenerateServicesOptions extends ParseOptions {
    */
   programs?: ts.Program[] | null;
 
-  /**
-   * @deprecated - this flag will be removed in the next major.
-   * Do not rely on the behavior provided by this flag.
-   */
-  DEPRECATED__createDefaultProgram?: boolean;
-
   /**
    * ESLint (and therefore typescript-eslint) is used in both "single run"/one-time contexts,
    * such as an ESLint CLI invocation, and long-running sessions (such as continuous feedback

diff --git a/packages/typescript-estree/src/parser.ts b/packages/typescript-estree/src/parser.ts
@@ -3,7 +3,6 @@ import type * as ts from 'typescript';
 
 import { astConverter } from './ast-converter';
 import { convertError } from './convert';
-import { createDefaultProgram } from './create-program/createDefaultProgram';
 import { createIsolatedProgram } from './create-program/createIsolatedProgram';
 import { createProjectProgram } from './create-program/createProjectProgram';
 import {
@@ -76,24 +75,10 @@ function getProgramAndAST(
     return createNoProgram(parseSettings);
   }
 
-  const fromProjectProgram = createProjectProgram(
+  return createProjectProgram(
     parseSettings,
     getWatchProgramsForProjects(parseSettings),
   );
-  if (fromProjectProgram) {
-    return fromProjectProgram;
-  }
-
-  // eslint-disable-next-line deprecation/deprecation -- will be cleaned up with the next major
-  if (parseSettings.DEPRECATED__createDefaultProgram) {
-    // eslint-disable-next-line deprecation/deprecation -- will be cleaned up with the next major
-    const fromDefaultProgram = createDefaultProgram(parseSettings);
-    if (fromDefaultProgram) {
-      return fromDefaultProgram;
-    }
-  }
-
-  return createIsolatedProgram(parseSettings);
 }
 
 // eslint-disable-next-line @typescript-eslint/no-empty-interface

diff --git a/packages/typescript-estree/tests/lib/semanticInfo.test.ts b/packages/typescript-estree/tests/lib/semanticInfo.test.ts
@@ -302,15 +302,6 @@ describe('semanticInfo', () => {
     });
   }
 
-  it('default program produced with option', () => {
-    const parseResult = parseCodeAndGenerateServices('var foo = 5;', {
-      ...createOptions('<input>'),
-      DEPRECATED__createDefaultProgram: true,
-    });
-
-    expectToHaveParserServices(parseResult.services);
-  });
-
   it('empty programs array should throw', () => {
     const fileName = path.resolve(FIXTURES_DIR, 'isolated-file.src.ts');
     const badConfig = createOptions(fileName);

diff --git a/packages/website/src/components/linter/config.ts b/packages/website/src/components/linter/config.ts
@@ -10,7 +10,6 @@ export const defaultParseSettings: ParseSettings = {
   comment: true,
   comments: [],
   debugLevel: new Set(),
-  DEPRECATED__createDefaultProgram: false,
   errorOnTypeScriptSyntacticAndSemanticIssues: false,
   errorOnUnknownASTType: false,
   EXPERIMENTAL_projectService: undefined,