typescript-eslint · JoshuaKGoldberg · Oct 19, 2023 · Jul 27, 2023 · Jul 28, 2023 · Jul 28, 2023
diff --git a/.eslintrc.js b/.eslintrc.js
@@ -20,9 +20,8 @@ module.exports = {
   extends: [
     'eslint:recommended',
     'plugin:eslint-plugin/recommended',
-    'plugin:@typescript-eslint/recommended-type-checked',
+    'plugin:@typescript-eslint/strict-type-checked',
     'plugin:@typescript-eslint/stylistic-type-checked',
-    // TODO: consider enabling strict-type-checked
   ],
   parserOptions: {
     sourceType: 'module',
@@ -53,7 +52,10 @@ module.exports = {
     // make sure we're not leveraging any deprecated APIs
     'deprecation/deprecation': 'error',
 
-    // TODO(#7138): Investigate enabling these soon ✨
+    // TODO(#7338): Investigate enabling these soon ✨
+    '@typescript-eslint/consistent-indexed-object-style': 'off',
+    '@typescript-eslint/no-unnecessary-condition': 'off',
+    '@typescript-eslint/no-dynamic-delete': 'off',
     '@typescript-eslint/prefer-nullish-coalescing': 'off',
 
     // TODO(#7130): Investigate changing these in or removing these from presets
@@ -85,6 +87,12 @@ module.exports = {
     '@typescript-eslint/no-explicit-any': 'error',
     '@typescript-eslint/no-non-null-assertion': 'off',
     '@typescript-eslint/no-var-requires': 'off',
+    '@typescript-eslint/prefer-literal-enum-member': [
+      'error',
+      {
+        allowBitwiseExpressions: true,
+      },
+    ],
     '@typescript-eslint/unbound-method': 'off',
     '@typescript-eslint/restrict-template-expressions': [
       'error',

diff --git a/packages/ast-spec/tests/ast-node-types.type-test.ts b/packages/ast-spec/tests/ast-node-types.type-test.ts
@@ -12,4 +12,5 @@ type TakesString<T extends Record<string, string>> = T;
 type _Test =
   // forcing the test onto a new line so it isn't covered by the expect error
   // If there are any enum members that don't have a corresponding TSESTree.Node, then this line will error with "Type 'string | number | symbol' is not assignable to type 'string'."
+  // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
   TakesString<AllKeys> | void;
diff --git a/packages/eslint-plugin/src/rules/default-param-last.ts b/packages/eslint-plugin/src/rules/default-param-last.ts
@@ -24,7 +24,7 @@ export default createRule({
      * @private
      */
     function isOptionalParam(node: TSESTree.Parameter): boolean {
-      return 'optional' in node && node.optional === true;
+      return 'optional' in node && node.optional;
     }
 
     /**

diff --git a/packages/eslint-plugin/src/rules/explicit-function-return-type.ts b/packages/eslint-plugin/src/rules/explicit-function-return-type.ts
@@ -138,7 +138,7 @@ export default createRule<Options, MessageIds>({
             case AST_NODE_TYPES.Property: {
               if (
                 parent.key.type === AST_NODE_TYPES.Identifier &&
-                parent.computed === false
+                !parent.computed
               ) {
                 funcName = parent.key.name;
               }

diff --git a/packages/eslint-plugin/src/rules/naming-convention-utils/enums.ts b/packages/eslint-plugin/src/rules/naming-convention-utils/enums.ts
@@ -50,6 +50,7 @@ enum Selectors {
 type SelectorsString = keyof typeof Selectors;
 
 enum MetaSelectors {
+  /* eslint-disable @typescript-eslint/prefer-literal-enum-member */
   default = -1,
   variableLike = 0 |
     Selectors.variable |
@@ -79,6 +80,7 @@ enum MetaSelectors {
     Selectors.classProperty |
     Selectors.objectLiteralProperty |
     Selectors.typeProperty,
+  /* eslint-enable @typescript-eslint/prefer-literal-enum-member */
 }
 type MetaSelectorsString = keyof typeof MetaSelectors;
 type IndividualAndMetaSelectorsString = MetaSelectorsString | SelectorsString;

diff --git a/packages/eslint-plugin/src/rules/naming-convention-utils/parse-options.ts b/packages/eslint-plugin/src/rules/naming-convention-utils/parse-options.ts
@@ -87,6 +87,7 @@ function parseOptions(context: Context): ParsedOptions {
   const result = getEnumNames(Selectors).reduce((acc, k) => {
     acc[k] = createValidator(k, context, normalizedOptions);
     return acc;
+    // eslint-disable-next-line @typescript-eslint/prefer-reduce-type-parameter
   }, {} as ParsedOptions);
 
   return result;

diff --git a/packages/eslint-plugin/src/rules/no-empty-function.ts b/packages/eslint-plugin/src/rules/no-empty-function.ts
@@ -155,7 +155,7 @@ export default createRule<Options, MessageIds>({
         isAllowedOverrideMethods &&
         isBodyEmpty(node) &&
         node.parent?.type === AST_NODE_TYPES.MethodDefinition &&
-        node.parent.override === true
+        node.parent.override
       );
     }
 

diff --git a/packages/eslint-plugin/src/rules/no-namespace.ts b/packages/eslint-plugin/src/rules/no-namespace.ts
@@ -52,10 +52,7 @@ export default createRule<Options, MessageIds>({
     const filename = context.getFilename();
 
     function isDeclaration(node: TSESTree.Node): boolean {
-      if (
-        node.type === AST_NODE_TYPES.TSModuleDeclaration &&
-        node.declare === true
-      ) {
+      if (node.type === AST_NODE_TYPES.TSModuleDeclaration && node.declare) {
         return true;
       }
 

diff --git a/packages/eslint-plugin/src/rules/no-non-null-asserted-nullish-coalescing.ts b/packages/eslint-plugin/src/rules/no-non-null-asserted-nullish-coalescing.ts
@@ -26,9 +26,7 @@ function isDefinitionWithAssignment(definition: Definition): boolean {
   }
 
   const variableDeclarator = definition.node;
-  return (
-    variableDeclarator.definite === true || variableDeclarator.init != null
-  );
+  return variableDeclarator.definite || variableDeclarator.init != null;
 }
 
 export default createRule({

diff --git a/packages/eslint-plugin/src/rules/no-redeclare.ts b/packages/eslint-plugin/src/rules/no-redeclare.ts
@@ -71,8 +71,7 @@ export default createRule<Options, MessageIds>({
         node?: TSESTree.Comment | TSESTree.Identifier;
         loc?: TSESTree.SourceLocation;
       },
-      void,
-      unknown
+      void
     > {
       if (
         options?.builtinGlobals &&

diff --git a/packages/eslint-plugin/src/rules/no-shadow.ts b/packages/eslint-plugin/src/rules/no-shadow.ts
@@ -284,7 +284,7 @@ export default createRule<Options, MessageIds>({
      * @returns Whether or not the variable name is allowed.
      */
     function isAllowed(variable: TSESLint.Scope.Variable): boolean {
-      return options.allow!.indexOf(variable.name) !== -1;
+      return options.allow!.includes(variable.name);
     }
 
     /**

diff --git a/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts b/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts
@@ -186,7 +186,7 @@ export default createRule({
         }
 
         let key: string;
-        if (receiverProperty.computed === false) {
+        if (!receiverProperty.computed) {
           key =
             receiverProperty.key.type === AST_NODE_TYPES.Identifier
               ? receiverProperty.key.name

diff --git a/packages/eslint-plugin/src/rules/prefer-regexp-exec.ts b/packages/eslint-plugin/src/rules/prefer-regexp-exec.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/prefer-literal-enum-member */
 import type { TSESTree } from '@typescript-eslint/utils';
 import { AST_NODE_TYPES } from '@typescript-eslint/utils';
 import * as tsutils from 'ts-api-utils';

diff --git a/packages/eslint-plugin/src/util/collectUnusedVariables.ts b/packages/eslint-plugin/src/util/collectUnusedVariables.ts
@@ -323,7 +323,7 @@ class UnusedVarsVisitor<
 
   protected TSModuleDeclaration(node: TSESTree.TSModuleDeclaration): void {
     // -- global augmentation can be in any file, and they do not need exports
-    if (node.global === true) {
+    if (node.global) {
       this.markVariableAsUsed('global', node.parent);
     }
   }

diff --git a/packages/eslint-plugin/src/util/getOperatorPrecedence.ts b/packages/eslint-plugin/src/util/getOperatorPrecedence.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/prefer-literal-enum-member -- the enums come from TS so to make merging upstream easier we purposely avoid adding literal values. */
 import type { TSESTree } from '@typescript-eslint/utils';
 import { AST_NODE_TYPES } from '@typescript-eslint/utils';
 import { SyntaxKind } from 'typescript';

diff --git a/packages/eslint-plugin/tools/generate-configs.ts b/packages/eslint-plugin/tools/generate-configs.ts
@@ -74,10 +74,8 @@ async function main(): Promise<void> {
   );
   const EXTENDS = ['./configs/base', './configs/eslint-recommended'];
 
-  type RuleEntry = [
-    string,
-    TSESLint.RuleModule<string, readonly unknown[], TSESLint.RuleListener>,
-  ];
+  // TODO: migrate to import { RuleModule } from '@typescript-eslint/utils/ts-eslint'
+  type RuleEntry = [string, TSESLint.RuleModule<string, readonly unknown[]>];
 
   const allRuleEntries: RuleEntry[] = Object.entries(rules).sort((a, b) =>
     a[0].localeCompare(b[0]),

diff --git a/packages/rule-tester/src/RuleTester.ts b/packages/rule-tester/src/RuleTester.ts
@@ -237,7 +237,7 @@ export class RuleTester extends TestFramework {
 
     // convenience iterator to make it easy to loop all tests without a concat
     const allTestsIterator = {
-      *[Symbol.iterator](): Generator<ValidTestCase<TOptions>, void, unknown> {
+      *[Symbol.iterator](): Generator<ValidTestCase<TOptions>, void> {
         for (const testCase of normalizedTests.valid) {
           yield testCase;
         }

diff --git a/packages/rule-tester/src/TestFramework.ts b/packages/rule-tester/src/TestFramework.ts
@@ -51,6 +51,7 @@ let OVERRIDE_IT_SKIP: Maybe<RuleTesterTestFrameworkFunctionBase> = null;
  * allows the user to manually supply functions in case they want to roll their
  * own tooling
  */
+// eslint-disable-next-line @typescript-eslint/no-extraneous-class
 export abstract class TestFramework {
   /**
    * Runs a function after all the tests in this file have completed.

diff --git a/packages/rule-tester/tests/RuleTester.test.ts b/packages/rule-tester/tests/RuleTester.test.ts
@@ -119,7 +119,7 @@ beforeEach(() => {
   jest.clearAllMocks();
 });
 
-const NOOP_RULE: RuleModule<'error', []> = {
+const NOOP_RULE: RuleModule<'error'> = {
   meta: {
     messages: {
       error: 'error',

diff --git a/packages/scope-manager/src/definition/DefinitionBase.ts b/packages/scope-manager/src/definition/DefinitionBase.ts
@@ -9,7 +9,7 @@ abstract class DefinitionBase<
   TType extends DefinitionType,
   TNode extends TSESTree.Node,
   TParent extends TSESTree.Node | null,
-  TName extends TSESTree.Node = TSESTree.BindingName,
+  TName extends TSESTree.Node,
 > {
   /**
    * A unique ID for this instance - primarily used to help debugging and testing

diff --git a/packages/scope-manager/tests/util/getSpecificNode.ts b/packages/scope-manager/tests/util/getSpecificNode.ts
@@ -1,17 +1,13 @@
 import type { AST_NODE_TYPES, TSESTree } from '@typescript-eslint/types';
 import { simpleTraverse } from '@typescript-eslint/typescript-estree';
 
-function getSpecificNode<
-  TSelector extends AST_NODE_TYPES,
-  TNode extends Extract<TSESTree.Node, { type: TSelector }>,
->(ast: TSESTree.Node, selector: TSelector): TNode;
 function getSpecificNode<
   TSelector extends AST_NODE_TYPES,
   TNode extends Extract<TSESTree.Node, { type: TSelector }>,
 >(
   ast: TSESTree.Node,
   selector: TSelector,
-  cb: (node: TNode) => boolean | null | undefined,
+  cb?: (node: TNode) => boolean | null | undefined,
 ): TNode;
 function getSpecificNode<
   TSelector extends AST_NODE_TYPES,

diff --git a/packages/scope-manager/tests/util/serializers/DefinitionBase.ts b/packages/scope-manager/tests/util/serializers/DefinitionBase.ts
@@ -1,9 +1,17 @@
+import type { TSESTree } from '@typescript-eslint/types';
+
 import { DefinitionBase } from '../../../src/definition/DefinitionBase';
 import { createSerializer } from './baseSerializer';
 
 // hacking around the fact that you can't use abstract classes generically
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-class DefinitionInstance extends DefinitionBase<any, any, any> {
+class DefinitionInstance extends DefinitionBase<
+  /* eslint-disable @typescript-eslint/no-explicit-any */
+  any,
+  any,
+  any,
+  /* eslint-enable @typescript-eslint/no-explicit-any */
+  TSESTree.BindingName
+> {
   isTypeDefinition = false;
   isVariableDefinition = false;
 }

diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
@@ -198,7 +198,7 @@ export class Converter {
       const isType =
         result.type === AST_NODE_TYPES.TSInterfaceDeclaration ||
         result.type === AST_NODE_TYPES.TSTypeAliasDeclaration;
-      const isDeclare = 'declare' in result && result.declare === true;
+      const isDeclare = 'declare' in result && result.declare;
       return this.createNode<TSESTree.ExportNamedDeclaration>(node, {
         type: AST_NODE_TYPES.ExportNamedDeclaration,
         // @ts-expect-error - TODO, narrow the types here

diff --git a/packages/typescript-estree/src/parseSettings/ExpiringCache.ts b/packages/typescript-estree/src/parseSettings/ExpiringCache.ts
@@ -4,7 +4,7 @@ export const DEFAULT_TSCONFIG_CACHE_DURATION_SECONDS = 30;
 const ZERO_HR_TIME: [number, number] = [0, 0];
 
 export interface CacheLike<Key, Value> {
-  get(key: Key): Value | void;
+  get(key: Key): Value | undefined;
   set(key: Key, value: Value): this;
 }
 

diff --git a/packages/typescript-estree/tests/lib/parse.test.ts b/packages/typescript-estree/tests/lib/parse.test.ts
@@ -362,7 +362,7 @@ describe('parseAndGenerateServices', () => {
               filePath: join(PROJECT_DIR, filePath),
             });
           } catch (error) {
-            throw alignErrorPath(error as Error);
+            alignErrorPath(error as Error);
           }
         };
 
@@ -499,7 +499,7 @@ describe('parseAndGenerateServices', () => {
                 filePath: join(PROJECT_DIR, filePath),
               });
             } catch (error) {
-              throw alignErrorPath(error as Error);
+              alignErrorPath(error as Error);
             }
           };
 

diff --git a/packages/utils/src/eslint-utils/getParserServices.ts b/packages/utils/src/eslint-utils/getParserServices.ts
@@ -7,6 +7,7 @@ import type {
 const ERROR_MESSAGE =
   '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.';
 
+/* eslint-disable @typescript-eslint/unified-signatures */
 /**
  * Try to retrieve type-aware parser service from context.
  * This **_will_** throw if it is not available.
@@ -83,5 +84,6 @@ function getParserServices(
 
   return context.parserServices;
 }
+/* eslint-enable @typescript-eslint/unified-signatures */
 
 export { getParserServices };
diff --git a/packages/utils/src/json-schema.ts b/packages/utils/src/json-schema.ts
@@ -33,7 +33,6 @@ export type JSONSchema4TypeExtended =
   | JSONSchema4Object;
 
 // Workaround for infinite type recursion
-// eslint-disable-next-line @typescript-eslint/consistent-indexed-object-style
 export interface JSONSchema4Object {
   [key: string]: JSONSchema4TypeExtended;
 }

diff --git a/packages/utils/src/ts-eslint/SourceCode.ts b/packages/utils/src/ts-eslint/SourceCode.ts
@@ -186,7 +186,7 @@ declare class TokenStore {
    */
   getTokensAfter<T extends SourceCode.CursorWithCountOptions>(
     node: TSESTree.Node | TSESTree.Token,
-    options?: T,
+    options?: T | number,
   ): SourceCode.ReturnTypeFromOptions<T>[];
   /**
    * Gets the `count` tokens that precedes a given node or token.
@@ -196,31 +196,19 @@ declare class TokenStore {
    */
   getTokensBefore<T extends SourceCode.CursorWithCountOptions>(
     node: TSESTree.Node | TSESTree.Token,
-    options?: T,
-  ): SourceCode.ReturnTypeFromOptions<T>[];
-  /**
-   * Gets all of the tokens between two non-overlapping nodes.
-   * @param left Node before the desired token range.
-   * @param right Node after the desired token range.
-   * @param options The option object. If this is a function then it's `options.filter`.
-   * @returns Tokens between left and right.
-   */
-  getTokensBetween<T extends SourceCode.CursorWithCountOptions>(
-    left: TSESTree.Node | TSESTree.Token,
-    right: TSESTree.Node | TSESTree.Token,
-    padding?: T,
+    options?: T | number,
   ): SourceCode.ReturnTypeFromOptions<T>[];
   /**
    * Gets all of the tokens between two non-overlapping nodes.
    * @param left Node before the desired token range.
    * @param right Node after the desired token range.
-   * @param padding Number of extra tokens on either side of center.
+   * @param options The option object. If this is a number then it's `options.count`. If this is a function then it's `options.filter`.
    * @returns Tokens between left and right.
    */
   getTokensBetween<T extends SourceCode.CursorWithCountOptions>(
     left: TSESTree.Node | TSESTree.Token,
     right: TSESTree.Node | TSESTree.Token,
-    padding?: number,
+    options?: T | number,
   ): SourceCode.ReturnTypeFromOptions<T>[];
 }
 

diff --git a/packages/website-eslint/src/mock/eslint.js b/packages/website-eslint/src/mock/eslint.js
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-extraneous-class */
 class RuleTester {}
 class SourceCode {}
 

diff --git a/packages/website/plugins/generated-rule-docs.ts b/packages/website/plugins/generated-rule-docs.ts
@@ -40,7 +40,7 @@ const eslintPluginDirectory = path.resolve(
   path.join(__dirname, '../../eslint-plugin'),
 );
 
-function nodeIsParent(node: unist.Node<unist.Data>): node is unist.Parent {
+function nodeIsParent(node: unist.Node): node is unist.Parent {
   return 'children' in node;
 }
 

diff --git a/packages/website/src/hooks/useHistorySelector.ts b/packages/website/src/hooks/useHistorySelector.ts
@@ -2,7 +2,7 @@ import { useHistory } from '@docusaurus/router';
 import type * as H from 'history';
 import { useSyncExternalStore } from 'react';
 
-export type HistorySelector<T> = (history: H.History<H.LocationState>) => T;
+export type HistorySelector<T> = (history: H.History) => T;
 
 export function useHistorySelector<T>(
   selector: HistorySelector<T>,
-Original file line number
+Diff line change
@@ Expand Up / @@ -71,8 +71,7 @@ export default createRule<Options, MessageIds>({ @@
             node?: TSESTree.Comment | TSESTree.Identifier;
             loc?: TSESTree.SourceLocation;
           },
-          void,
-          unknown
+          void
         > {
           if (
             options?.builtinGlobals &&
@@ Expand Down @@