docs

Array.prototype.filter() expects a value to be returned at the end of arrow function.
eslint-plugin/tests/configs.test.ts:60
typescript-eslint/tests/configs.test.ts:64

docs

Unexpected block statement surrounding arrow body; move the returned value immediately after the=>.
eslint-plugin/src/rules/class-literal-property-style.ts:173
eslint-plugin/src/rules/max-params.ts:81
eslint-plugin/src/rules/naming-convention.ts:714
eslint-plugin/src/rules/no-array-delete.ts:92
eslint-plugin/src/rules/no-duplicate-type-constituents.ts:189
eslint-plugin/src/rules/no-extraneous-class.ts:72
eslint-plugin/src/rules/no-meaningless-void-operator.ts:52
eslint-plugin/src/rules/no-type-alias.ts:229
eslint-plugin/src/rules/no-unnecessary-template-expression.ts:41
eslint-plugin/src/rules/no-useless-template-literals.ts:42
eslint-plugin/src/rules/non-nullable-type-assertion-style.ts:94
eslint-plugin/src/rules/prefer-enum-initializers.ts:42
eslint-plugin/src/rules/prefer-enum-initializers.ts:49
eslint-plugin/src/rules/prefer-enum-initializers.ts:56
eslint-plugin/src/rules/prefer-find.ts:258
eslint-plugin/src/rules/prefer-find.ts:298
eslint-plugin/src/rules/prefer-function-type.ts:145
eslint-plugin/tests/rules/block-spacing.test.ts:78
type-utils/src/builtinSymbolLikes.ts:81
website/plugins/blog-footer.ts:6
website/plugins/generated-rule-docs/index.ts:17
website/src/components/ErrorsViewer.tsx:136
website/src/components/config/ConfigEditor.tsx:99
website/src/components/config/ConfigTypeScript.tsx:33
website/src/components/editor/LoadedEditor.tsx:270
website/src/components/hooks/useResizeObserver.ts:7
website/src/components/inputs/Text.tsx:17
website/src/components/linter/createParser.ts:27
website/src/pages/play.tsx:16

Unexpected block statement surrounding arrow body; parenthesize the returned value and move it immediately after the=>.
eslint-plugin/src/rules/ban-tslint-comment.ts:33
eslint-plugin/tests/rules/prefer-readonly-parameter-types.test.ts:530
rule-tester/src/RuleTester.ts:327
rule-tester/tests/RuleTester.test.ts:95
rule-tester/tests/RuleTester.test.ts:138
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:23
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:35
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:51
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:56
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:66
website/sidebars/sidebar.rules.js:3
website/sidebars/sidebar.rules.js:13

docs

Expectedthis to be used by class methodBreakStatement.
scope-manager/src/referencer/Referencer.ts:386

Expectedthis to be used by class methodContinueStatement.
scope-manager/src/referencer/Referencer.ts:425

Expectedthis to be used by class methodDecorator.
scope-manager/src/referencer/PatternVisitor.ts:90

Expectedthis to be used by class methodExportAllDeclaration.
scope-manager/src/referencer/Referencer.ts:429

Expectedthis to be used by class methodImportAttribute.
scope-manager/src/referencer/Referencer.ts:813

Expectedthis to be used by class methodisES6.
scope-manager/src/ScopeManager.ts:87

Expectedthis to be used by class methodisStrictModeSupported.
scope-manager/src/ScopeManager.ts:83

Expectedthis to be used by class methodisValidResolution.
scope-manager/src/scope/ScopeBase.ts:374

Expectedthis to be used by class methodJSXClosingElement.
scope-manager/src/referencer/Referencer.ts:517

Expectedthis to be used by class methodMetaProperty.
scope-manager/src/referencer/Referencer.ts:575

Expectedthis to be used by class methodPrivateIdentifier.
scope-manager/src/referencer/ClassVisitor.ts:319
scope-manager/src/referencer/Referencer.ts:584

Expectedthis to be used by class methodTSTypeAnnotation.
scope-manager/src/referencer/PatternVisitor.ts:136

docs

Default parameters should be last.
scope-manager/src/scope/ScopeBase.ts:444

docs

Unexpectedawait inside a loop.
repo-tools/src/generate-contributors.mts:59
repo-tools/src/generate-lib.mts:250

docs

Unexpected if as the only statement in an else block.
eslint-plugin/src/rules/consistent-type-imports.ts:181
eslint-plugin/src/rules/consistent-type-imports.ts:735
eslint-plugin/src/rules/func-call-spacing.ts:155
eslint-plugin/src/rules/member-delimiter-style.ts:276
eslint-plugin/src/rules/no-non-null-assertion.ts:83
eslint-plugin/src/rules/no-unused-vars.ts:272
eslint-plugin/src/rules/prefer-optional-chain-utils/analyzeChain.ts:228
scope-manager/src/referencer/Referencer.ts:535
typescript-estree/src/convert.ts:986

docs

Unexpected negated condition.
ast-spec/tests/fixtures.test.ts:210
ast-spec/tests/fixtures.test.ts:314
eslint-plugin/src/rules/consistent-type-assertions.ts:119
eslint-plugin/src/rules/consistent-type-exports.ts:363
eslint-plugin/src/rules/key-spacing.ts:122
eslint-plugin/src/rules/member-ordering.ts:1056
eslint-plugin/src/rules/naming-convention-utils/parse-options.ts:43
eslint-plugin/src/rules/naming-convention-utils/parse-options.ts:47
eslint-plugin/src/rules/naming-convention-utils/parse-options.ts:55
eslint-plugin/src/rules/no-empty-interface.ts:98
eslint-plugin/src/rules/no-non-null-assertion.ts:57
eslint-plugin/src/rules/no-non-null-assertion.ts:101
eslint-plugin/src/rules/no-unnecessary-condition.ts:283
eslint-plugin/src/rules/no-unnecessary-condition.ts:285
eslint-plugin/src/rules/prefer-function-type.ts:126
eslint-plugin/src/rules/prefer-function-type.ts:164
eslint-plugin/src/rules/type-annotation-spacing.ts:44
eslint-plugin/src/rules/type-annotation-spacing.ts:45
eslint-plugin/src/rules/unified-signatures.ts:214
eslint-plugin/src/rules/unified-signatures.ts:216
eslint-plugin/src/rules/unified-signatures.ts:534
eslint-plugin/src/util/getFunctionHeadLoc.ts:40
eslint-plugin/src/util/getMemberHeadLoc.ts:52
eslint-plugin/tests/rules/prefer-optional-chain/base-cases.ts:274
rule-schema-to-typescript-types/src/generateArrayType.ts:47
scope-manager/src/referencer/ExportVisitor.ts:61
scope-manager/src/referencer/Referencer.ts:180
scope-manager/src/referencer/Referencer.ts:343
scope-manager/src/referencer/Referencer.ts:532
scope-manager/src/scope/ScopeBase.ts:356
scope-manager/tests/test-utils/serializers/baseSerializer.ts:34
typescript-estree/src/convert.ts:998
typescript-estree/src/convert.ts:1326
typescript-estree/src/convert.ts:1427
typescript-estree/src/convert.ts:2335
typescript-estree/src/convert.ts:2995
typescript-estree/src/create-program/getWatchProgramsForProjects.ts:336
typescript-estree/src/create-program/shared.ts:59
typescript-estree/tests/lib/parse.test.ts:206
website/src/components/ast/PropertyValue.tsx:70
website/src/components/ast/PropertyValue.tsx:79
website/src/components/inputs/CopyButton.tsx:41
website/src/components/inputs/Dropdown.tsx:24
website/src/components/layout/EditorTabs.tsx:25

docs

Its not necessary to initializepreviousRank: number | undefined` to undefined.
eslint-plugin/src/rules/member-ordering.ts:656

Its not necessary to initializeprevNode: TSESTree.Node | undefined` to undefined.
eslint-plugin/src/rules/key-spacing.ts:392

Its not necessary to initializeprimitive: number | undefined` to undefined.
eslint-plugin/src/rules/no-redundant-type-constituents.ts:345

docs

Invalid loop. Its body allows only one iteration.
eslint-plugin/src/rules/no-mixed-enums.ts:174
eslint-plugin/src/rules/no-unsafe-return.ts:169

docs

Expected an assignment or function call and instead saw an expression.
eslint-plugin/src/rules/strict-boolean-expressions.ts:851
eslint-plugin/src/rules/unified-signatures.ts:502
typescript-estree/tests/lib/convert.test.ts:309
typescript-estree/tests/lib/convert.test.ts:326
typescript-estree/tests/lib/convert.test.ts:327
typescript-estree/tests/lib/convert.test.ts:342
typescript-estree/tests/lib/persistentParse.test.ts:68

docs

Unnecessary.call().
website/src/components/lib/debounce.ts:12

docs

Unnecessarily computed property [MemberExpression[computed=true]] found.
eslint-plugin/src/rules/prefer-find.ts:285

docs

Unexpected string concatenation of literals.
eslint-plugin/tests/rules/dot-notation.test.ts:242
eslint-plugin/tests/rules/dot-notation.test.ts:243
eslint-plugin/tests/rules/dot-notation.test.ts:282
eslint-plugin/tests/rules/dot-notation.test.ts:283

docs

Unnecessary return statement.
eslint-plugin/src/rules/explicit-module-boundary-types.ts:240
eslint-plugin/src/rules/no-misused-promises.ts:346
eslint-plugin/src/rules/no-unnecessary-condition.ts:403
eslint-plugin/src/rules/prefer-reduce-type-parameter.ts:116
eslint-plugin/src/rules/prefer-return-this-type.ts:115
eslint-plugin/src/rules/prefer-return-this-type.ts:118
eslint-plugin/src/rules/return-await.ts:359
eslint-plugin/src/util/getThisExpression.ts:21
rule-schema-to-typescript-types/src/optimizeAST.ts:51
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:13
typescript-estree/tests/lib/semanticInfo-singleRun.test.ts:16
website/src/components/lib/scroll-into.ts:32

docs

Unexpected var, use let or const instead.
website-eslint/src/mock/path.js:150

docs

Expectedundefined and instead sawvoid.
rule-tester/src/RuleTester.ts:974

docs

Expected method shorthand.
eslint-plugin/src/rules/no-unnecessary-boolean-literal-compare.ts:219
eslint-plugin/src/rules/no-unnecessary-qualifier.ts:179

Expected property shorthand.
eslint-plugin/src/rules/indent.ts:282
eslint-plugin/src/rules/index.ts:177
eslint-plugin/src/rules/index.ts:281
eslint-plugin/src/rules/index.ts:287
eslint-plugin/src/rules/index.ts:296
eslint-plugin/src/rules/no-unsafe-assignment.ts:404
eslint-plugin/src/rules/no-unsafe-call.ts:72
eslint-plugin/src/rules/type-annotation-spacing.ts:60
eslint-plugin/src/rules/type-annotation-spacing.ts:61
eslint-plugin/tests/rules/naming-convention/cases/createTestCases.ts:288
rule-tester/src/utils/validationHelpers.ts:114
typescript-estree/src/convert.ts:2339
typescript-estree/src/convert.ts:2907
typescript-estree/src/convert.ts:3047
typescript-estree/src/parseSettings/createParseSettings.ts:167
website-eslint/src/mock/assert.js:70
website-eslint/src/mock/assert.js:71
website-eslint/src/mock/assert.js:72
website-eslint/src/mock/assert.js:73
website-eslint/src/mock/assert.js:74
website-eslint/src/mock/path.js:220
website-eslint/src/mock/path.js:221
website-eslint/src/mock/path.js:222
website-eslint/src/mock/path.js:223
website-eslint/src/mock/path.js:224
website-eslint/src/mock/path.js:225
website-eslint/src/mock/path.js:226
website-eslint/src/mock/path.js:227
website-eslint/src/mock/path.js:228
website-eslint/src/mock/path.js:229
website/sidebars/sidebar.rules.js:5
website/src/components/ast/DataRenderer.tsx:146
website/src/components/lib/jsonSchema.ts:128
website/src/components/lib/jsonSchema.ts:209
website/src/components/linter/createLinter.ts:69
website/src/components/linter/createLinter.ts:107
website/src/components/linter/createParser.ts:60
website/src/components/linter/createParser.ts:62
website/src/components/linter/utils.ts:98

docs

Assignment (=) can be replaced with operator assignment (+=).
rule-schema-to-typescript-types/src/index.ts:53

docs

Unexpected function expression.
website-eslint/src/mock/path.js:85
website-eslint/src/mock/path.js:102
website-eslint/src/mock/path.js:127

docs

isPathAbsolute is never reassigned. Useconst instead.
website-eslint/src/mock/path.js:97

trailingSlash is never reassigned. Useconst instead.
website-eslint/src/mock/path.js:98

docs

UseObject.hasOwn() instead ofObject.prototype.hasOwnProperty.call().
eslint-plugin-internal/src/rules/prefer-ast-types-enum.ts:58
eslint-plugin-internal/src/rules/prefer-ast-types-enum.ts:62
eslint-plugin-internal/src/rules/prefer-ast-types-enum.ts:66
eslint-plugin/src/rules/no-duplicate-type-constituents.ts:48
eslint-plugin/src/rules/no-restricted-imports.ts:175
eslint-plugin/src/rules/no-restricted-imports.ts:181
rule-tester/src/utils/cloneDeeplyExcludesParent.ts:14
rule-tester/src/utils/freezeDeeply.ts:10
rule-tester/src/utils/serialization.ts:29
type-utils/src/isTypeReadonly.ts:47
typescript-estree/tests/test-utils/test-utils.ts:127

docs

Use an object spread instead ofObject.assign eg:{ ...foo }.
eslint-plugin/src/rules/ban-types.ts:210
eslint-plugin/src/rules/indent.ts:184
eslint-plugin/src/rules/no-extra-parens.ts:306
eslint-plugin/src/util/getFunctionHeadLoc.ts:200
eslint-plugin/src/util/getFunctionHeadLoc.ts:201
parser/tests/test-utils/test-utils.ts:43
parser/tests/test-utils/test-utils.ts:75
rule-tester/src/RuleTester.ts:404
utils/tests/eslint-utils/deepMerge.test.ts:41

docs

Use the rest parameters instead ofarguments.
website-eslint/src/mock/path.js:67
website-eslint/src/mock/path.js:125

docs

Unexpected string concatenation.
ast-spec/tests/util/serialize-error.ts:17
ast-spec/tests/util/snapshot-diff.ts:60
eslint-plugin-internal/src/rules/plugin-test-formatting.ts:66
eslint-plugin/src/rules/consistent-generic-constructors.ts:106
eslint-plugin/src/rules/no-floating-promises.ts:70
eslint-plugin/src/rules/no-floating-promises.ts:72
eslint-plugin/src/rules/no-unsafe-assignment.ts:327
eslint-plugin/src/rules/no-unsafe-assignment.ts:328
eslint-plugin/src/rules/prefer-function-type.ts:147
eslint-plugin/src/rules/prefer-optional-chain-utils/analyzeChain.ts:348
eslint-plugin/src/rules/prefer-optional-chain-utils/analyzeChain.ts:358
eslint-plugin/src/rules/unbound-method.ts:107
eslint-plugin/src/rules/use-unknown-in-catch-callback-variable.ts:45
eslint-plugin/src/rules/use-unknown-in-catch-callback-variable.ts:47
eslint-plugin/src/rules/use-unknown-in-catch-callback-variable.ts:50
eslint-plugin/tests/docs.test.ts:86
eslint-plugin/tests/docs.test.ts:90
eslint-plugin/tests/docs.test.ts:100
eslint-plugin/tests/docs.test.ts:455
eslint-plugin/tests/docs.test.ts:461
eslint-plugin/tests/docs.test.ts:469
eslint-plugin/tests/docs.test.ts:475
eslint-plugin/tests/docs.test.ts:485
eslint-plugin/tools/generate-breaking-changes.mts:42
parser/tests/test-utils/test-utils.ts:90
rule-schema-to-typescript-types/src/index.ts:53
typescript-estree/tests/test-utils/test-utils.ts:61
utils/tests/eslint-utils/getParserServices.test.ts:36
website-eslint/build.ts:26
website-eslint/build.ts:33
website-eslint/src/mock/assert.js:54
website-eslint/src/mock/path.js:76
website/src/components/editor/createProvideTwoslashInlay.ts:71
website/src/components/editor/createProvideTwoslashInlay.ts:83
website/src/components/editor/useSandboxServices.ts:88
website/tools/generate-website-dts.ts:56

docs

Missing radix parameter.
eslint-plugin/src/util/misc.ts:163
eslint-plugin/tests/schemas.test.ts:172