@typescript-eslint/types

Features

• eslint-plugin: lazy load rules

• eslint-plugin: [await-thenable] add allowMixedPromiseArrays option

• typescript-estree: error on abstract keyword that precedes export

Fixes

• ast-spec: add JSXFragment to JSXAttribute['value']

• eslint-plugin: [prefer-readonly-parameter-types] check where allowed type aliases are declared

• eslint-plugin: [no-deprecated] report deprecated properties in object literals

• eslint-plugin: use isTypeLiteralType instead of type.isLiteral() to include bigint literals on TS < 5.0

• eslint-plugin: [require-array-sort-compare] check tuples

• eslint-plugin: [require-array-sort-compare] ignore extra this type argument on TS < 5.1

• type-utils: discriminateAnyType crashes when calling getAwaitedType on awaited type in TS < 5.0

• typescript-estree: include leading and trailing comments & whitespace in Program range

Fixes

• eslint-plugin: [no-unused-vars] avoid false-positives when not using our parser

• eslint-plugin: [no-unnecessary-type-parameters] count instantiated mapped type templates

• eslint-plugin: [no-unused-vars] ignore type-only refs for after-used

• eslint-plugin: [no-unnecessary-type-parameters] parenthesize constraint in optional tuple elements

• eslint-plugin: [prefer-optional-chain] safe fix when the chain ends with a strict null comparison

• type-utils: match linked packages and packages with missing version in TypeOrValueSpecifier

Fixes

• eslint-plugin: [no-misused-promises] skip argument checks for calls without arguments

• eslint-plugin: [no-unused-vars] report usedOnlyAsType for partially exported merged declarations

• eslint-plugin: [require-array-sort-compare] use array argument type constraint

• eslint-plugin: [no-unsafe-enum-assignment] skip identical types and bound deep type walks

• eslint-plugin: [no-confusing-void-expression] don't autofix when declared return type is unknown

• eslint-plugin: [prefer-optional-chain] check the constrained type

• eslint-plugin: [no-unnecessary-type-parameters] count instantiated mapped type constraints

• project-service: throttle cleanup when opening files

• type-utils: match re-exports and global declarations in TypeOrValueSpecifier

Features

• eslint-plugin: [no-unsafe-enum-assignment] add rule

Fixes

• eslint-plugin: [switch-exhaustiveness-check] always sort literal cases in stable order

• eslint-plugin: [unbound-method] respect this: void on class properties

• eslint-plugin: [no-unnecessary-type-assertion] specialize generic assertion report message

• eslint-plugin: [no-misused-promises] handle a return outside of any function

Fixes

• ast-spec: narrow import attribute keys to identifiers and strings

• eslint-plugin: [no-useless-default-assignment] avoid false positives on tuples with a rest element

• eslint-plugin: [no-unnecessary-type-parameters] handle type precedence in the suggestion fixer

• eslint-plugin: [no-explicit-any] use unknown for bare any rest parameters

• eslint-plugin: [no-generated-empty-object-type] don't report a mapped type whose keys are not resolved yet

• eslint-plugin: [no-misused-spread] omit WeakMap spread suggestions

• eslint-plugin: [no-unnecessary-type-assertion] false positive for empty object asserted to a type alias of Record

• eslint-plugin: [no-meaningless-void-operator] allow void on assignment expressions

• eslint-plugin: [await-thenable] prevent autofix from breaking code when removing await

• eslint-plugin: [no-unnecessary-parameter-property-assignment] account for parameter reassignment

• eslint-plugin: [unbound-method] treat Intl.Collator.prototype.compare as spec-bound

• eslint-plugin: [no-unnecessary-condition] handle union-keyed index access on the left-hand side of nullish assignment

• eslint-plugin: [no-useless-default-assignment] convert the fixer to a suggestion fixer

• eslint-plugin: [no-misused-promises] handle multiple Promise constituents

• rule-tester: test the final autofix output instead of the first pass

• scope-manager: merge implicit global definitions

• type-utils: match package specifiers on whole path components

• typescript-estree: resolve symlinked paths when matching files to projects

• typescript-estree: add missing < token opening type arguments

• typescript-estree: require string literal import attribute values

• website: prevent playground from breaking down after opening link with the .js file type

Features

• eslint-plugin: [no-generated-empty-object-type] add rule

• website: generate per-page social preview cards

Fixes

• use stable release of pnpm 12

• update pnpm to 12.3.4 and dedupe Docusaurus packages

• eslint-plugin: [member-ordering] don't report fields that read fields declared before them

• eslint-plugin: [no-unnecessary-condition] no false positive on RHS of a nested logical expression

• eslint-plugin: [no-deprecated] report deprecated imported values used in object shorthand properties

• project-service: avoid discarded tsserver logs

• typescript-estree: clarify the parserOptions.project error message

Features

• eslint-plugin: [no-misused-promises] add flagUnions option for checkConditionals

Fixes

• eslint-plugin: [no-mixed-enums] use scope analysis instead of type checking for merged namespaces

• eslint-plugin: [unified-signatures] compare type parameters by constraint instead of name

• eslint-plugin: [no-meaningless-void-operator] report void on non-call expressions

• website: respect allowJs playground config

Features

• eslint-plugin: [strict-void-return] add fix suggestions

• utils: support ESLint rule meta.languages

Fixes

• eslint-plugin: [unified-signatures] deduplicate types in report

• eslint-plugin: [return-await] prevent autofix from breaking code in arrow-functions

• eslint-plugin: [unified-signatures] report identical signatures

• eslint-plugin: [no-unnecessary-type-assertion] prevent stack overflow in recursive types

• eslint-plugin: [no-floating-promises] setting ignoreVoid: false results in false negative in ArrowFunctionExpression

• eslint-plugin: [no-empty-object-type] ignore suggestions that result in invalid interfaces and export defaults

• website: playground crashes on extends configs

• website: account for thanks.dev and out-of-band donors in sponsors list

Features

• typescript-estree: handle import.defer() as ImportExpression

Fixes

• eslint-plugin: [no-unnecessary-type-conversion] ignore shadowed built-ins

• eslint-plugin: [prefer-nullish-coalescing] handle shadowed Boolean calls

• eslint-plugin: [no-useless-default-assignment] don't report defaults used by other overloads

• eslint-plugin: [no-unnecessary-type-parameters] check MappedType key remapping

• eslint-plugin: [class-literal-property-style] preserve type annotations and don't drop decorators

• website: list onUnsupportedTypeScriptVersion in parser options