21 Pull requests merged by 10 people

• Add new option "libReplacement"

  #60829 merged Jan 24, 2025

• allow calling goToDef on modifiers of named declarations

  #60384 merged Jan 24, 2025

• Expose method for retrieving inferred generic type arguments for a signature on the TypeChecker (#59637)

  #60201 merged Jan 24, 2025

• fix: do not use JSX.ElementChildrenAttribute under jsx: react-jsx or jsx: react-jsxdev

  #60880 merged Jan 24, 2025

• --erasableSyntaxOnly

  #61011 merged Jan 23, 2025

• Fix missing failed lookup locations when resolving bare-specifier package.json "imports"

  #60924 merged Jan 23, 2025

• Ensure createProgram stops referencing rootNamesOrOptions to ensure oldProgram is GC'd

  #61034 merged Jan 23, 2025

• Support require(esm) in --module nodenext

  #60761 merged Jan 23, 2025

• Narrow types by satisfies expressions

  #60782 merged Jan 22, 2025

• Fixed an issue with for statement's incrementor missing continue's control flow information

  #60950 merged Jan 22, 2025

• DOM update 2025/01/16

  #60987 merged Jan 22, 2025

• Treat BigInt type references in JSDoc as intended bigints

  #60863 merged Jan 22, 2025

• Add ESNext float16 features and fix TypedArrays of BigInt types

  #60151 merged Jan 22, 2025

• Fix ESM/CJS resolution cache collision in non-nodenext resolution modes

  #60910 merged Jan 21, 2025

• Fixed "Delete all unused declarations" to delete self-referential functions

  #60888 merged Jan 18, 2025

• Fixed wrong error being reported on required initialized parameters with isolatedDeclarations

  #60980 merged Jan 18, 2025

• fix(60563):@import * as namespace cannot be used with @implements

  #60566 merged Jan 17, 2025

• fix(60375): Parameter inlay hint is incorrect when function has a this type

  #60378 merged Jan 17, 2025

• fix(60592): JSDoc implements space sensetive

  #60640 merged Jan 17, 2025

• fix(60551): satisfies is shown on go-to-implementation

  #60801 merged Jan 17, 2025

• feat(60475): Add getUnknownType to checker api

  #60502 merged Jan 17, 2025

4 Pull requests opened by 4 people

• Allow getLiteralTypeFromProperty to extract name types from unions

  #60994 opened Jan 18, 2025

• Use better context scope for class constructor implementation signatures in JS files

  #61013 opened Jan 22, 2025

• Fixing slow paste with spinner

  #61032 opened Jan 23, 2025

• Disable broken CodeQL query

  #61040 opened Jan 24, 2025

42 Issues closed by 16 people

• Allow running `go to definition` on `export` and other keywords

  #60308 closed Jan 24, 2025

• Add typeChecker API to get the inferred type arguments of call expression

  #59637 closed Jan 24, 2025

• Confusing error when forgot to define `JSX.ElementChildrenAttribute` type

  #60572 closed Jan 24, 2025

• Tsconfig option to disallow features requiring transformations which are not supported by Node.js' --strip-types

  #59601 closed Jan 23, 2025

• type restriction no longer respected with indirect call involving const enum with number values

  #61033 closed Jan 23, 2025

• Memory Leak disposing oldProgram

  #58137 closed Jan 23, 2025

• HTMLImageElement#fetchPriority doesn't list allowed values

  #60940 closed Jan 23, 2025

• Allow literal enum members in conditions without type errors

  #61028 closed Jan 23, 2025

• Add 'extends' clause to 'infer' type

  #61026 closed Jan 23, 2025

• Title Incorrect Type Inference in Reverse Mapped Types When Only One Remaining Type Variable Exists

  #61027 closed Jan 23, 2025

• Add Support for Automatic JSON Serialization in TypeScript

  #61030 closed Jan 23, 2025

• Type check fails when union type has more than 12 literals

  #61031 closed Jan 23, 2025

• Typescript is not recognize the React.FC children in as props

  #61015 closed Jan 23, 2025

• Add `--module node22` (or `--module node20`) with support for `require(esm)`

  #60534 closed Jan 23, 2025

• Why does `{}` extend index signatures?

  #61024 closed Jan 22, 2025

• Suggestion: allow type predicates to be inferred when `satisfies boolean` is present

  #60778 closed Jan 22, 2025

• Evolving any ignores branches before a 'continue'

  #60945 closed Jan 22, 2025

• `lib.d.ts` Updates for TypeScript 5.8

  #60985 closed Jan 22, 2025

• <>

  #61019 closed Jan 22, 2025

• VoidFunction interface should be defined for ES5 target

  #61009 closed Jan 22, 2025

• WeakMap: Incorrect Type Acceptance for Extended Return Values in WeakMap

  #61018 closed Jan 22, 2025

• Operator '<' ***CAN*** be applied to types 'number | BigInt' and 'number'

  #57953 closed Jan 22, 2025

• Add missing periods at the end of sentences in documentation

  #61017 closed Jan 22, 2025

• Conditional Generic Type Narrowing fails when using an Enum/Union Type

  #61014 closed Jan 22, 2025

• TypedArray constructors: missing from mapping iterable

  #45199 closed Jan 22, 2025

• Big(Int|Uint)64ArrayConstructor: missing from Iterable

  #45198 closed Jan 22, 2025

• Add Stage 3 float16 features types

  #60148 closed Jan 22, 2025

• Missing Parentheses in TypeScript Documentation Example for #paths

  #60995 closed Jan 21, 2025

• “Unused” function in generic interface changes inferred return type of other function

  #61002 closed Jan 21, 2025

• Isolated declarations should infer `void` and `Promise<void>` for methods without return statements

  #60993 closed Jan 21, 2025

• TS Server fatal error: Debug Failure.

  #60243 closed Jan 21, 2025

• Generic type inferance not working

  #60981 closed Jan 20, 2025

• Type guard and assertion do not properly refine union types with optional properties

  #60979 closed Jan 20, 2025

• "Delete all unused declarations" cannot delete self-referencing declarations

  #57498 closed Jan 18, 2025

• [isolatedDeclarations] --isolatedDeclarations gives incorrect error when a parameter property with default value is followed by required parameter

  #60976 closed Jan 18, 2025

• Adding template literal key to spread object is ignored

  #60975 closed Jan 18, 2025

• `@import * as namespace` cannot be used with `@implements`

  #60563 closed Jan 17, 2025

• Parameter inlay hint is incorrect when function has a `this ` type

  #60375 closed Jan 17, 2025

• JSDoc implements space sensetive

  #60592 closed Jan 17, 2025

• `satisfies` is shown on go-to-implementation

  #60551 closed Jan 17, 2025

• Add `getUnknownType` to `checker` api

  #60475 closed Jan 17, 2025

• [isolatedDeclarations] Optional parameter in arrow function typed as imported generic type gets emitted as `any`

  #59292 closed Jan 17, 2025

28 Issues opened by 24 people

• Type inference fails to recognize never when it's the result of a template tag function

  #61039 opened Jan 24, 2025

• Support for switch statement shorthand

  #61038 opened Jan 24, 2025

• rewriteRelativeImportExtensions: tsc doesn't rewrite extensions in emitted declaration files

  #61037 opened Jan 24, 2025

• literal type in function argument becomes generic type when used in computed property within the function

  #61035 opened Jan 23, 2025

• [Bug] Fixing Module Resolution Cache Behavior in noDts Projects

  #61029 opened Jan 23, 2025

• Bug in conditional types with union types: AProperty should be number instead of never

  #61025 opened Jan 23, 2025

• TypeScript 5.8 Iteration Plan

  #61023 opened Jan 22, 2025

• ES2017 Async Generator Suspended on `yield*` Continues Execution When Returned

  #61022 opened Jan 22, 2025

• rewriteRelativeImportExtensions & enforce consistent extensions

  #61021 opened Jan 22, 2025

• Design Meeting Notes, 1/21/2025

  #61020 opened Jan 22, 2025

• Typescript mono repo rescanning issues

  #61012 opened Jan 22, 2025

• Memory leakage occurs in the getTypeAtLocation method in the latest version.

  #61008 opened Jan 22, 2025

• Treat `expr satisfies never;` similarly to a call to a never-returning function in CFA

  #61004 opened Jan 21, 2025

• Iteration Plan for typescript 5.8?

  #61003 opened Jan 21, 2025

• Property assignment in constructor with JSDoc @param wrongly reports type as any

  #61005 opened Jan 20, 2025

• Wrong function parameters when refactoring code containing a destructuring assignment with new variable names

  #61006 opened Jan 20, 2025

• Go to definition through sub-packages

  #61001 opened Jan 20, 2025

• [ServerErrors][TypeScript] 5.8.0-dev.20250119 vs 5.7.3

  #61000 opened Jan 19, 2025

• [ServerErrors][JavaScript] 5.8.0-dev.20250119 vs 5.7.3

  #60999 opened Jan 19, 2025

• [NewErrors] 5.8.0-dev.20250119 vs 5.7.3

  #60998 opened Jan 19, 2025

• Allow disable bad refactor suggestions

  #61007 opened Jan 19, 2025

• Allow interface merging for DecoratorMetadataObject and parameterization by This

  #60997 opened Jan 19, 2025

• document.getElementById is not correctly typed

  #60996 opened Jan 18, 2025

• Static method on abstract class with generic this parameter causes "excessively deep" error when called on concrete class

  #60992 opened Jan 17, 2025

• [isolatedDeclarations] Quick-fix for adding missing annotations can duplicate comments

  #60991 opened Jan 17, 2025

• Branded string literals revert to `string` in some cases

  #60990 opened Jan 17, 2025

• tsserver seems to watch entire home directory

  #60989 opened Jan 17, 2025

• JSDoc recursive inference not working properly on generic array wrapping

  #60988 opened Jan 17, 2025

66 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• Add support for `import defer` proposal

  #60757 commented on Jan 21, 2025 • 8 new comments

• fix(60908): Unexpected "'Type' is declared but its value is never read." error with jsdoc @import syntax

  #60921 commented on Jan 22, 2025 • 7 new comments

• feat(60442): show deprecation warnings on implementations of a deprecated property

  #60454 commented on Jan 19, 2025 • 7 new comments

• fix(60887): Incorrect Formatting on if (a) try {} finally {}

  #60898 commented on Jan 18, 2025 • 3 new comments

• fix(60562): Missing Go to definition links when accessing properties after jsdoc typecast

  #60653 commented on Jan 18, 2025 • 2 new comments

• Add source mappings for serialized properties with available declaration

  #60005 commented on Jan 22, 2025 • 1 new comment

• Fixed single signature type instantiations leaking between calls with different mappers

  #59972 commented on Jan 23, 2025 • 1 new comment

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on Jan 24, 2025 • 0 new comments

• Crash when defining `Array` type via `[]` syntax

  #57009 commented on Jan 24, 2025 • 0 new comments

• Expression produces a union type that is too complex to represent

  #53234 commented on Jan 24, 2025 • 0 new comments

• Order of ReadonlySet/ReadonlyMap in union causes differing key inference

  #52313 commented on Jan 24, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on Jan 24, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on Jan 24, 2025 • 0 new comments

• Support inferring `never` as the return type in JavaScript when overriding a class method that returns `never`

  #46791 commented on Jan 24, 2025 • 0 new comments

• Typescript 4.2.x - incorrectly infered generic return type of a record union (extra undefined)

  #43943 commented on Jan 24, 2025 • 0 new comments

• Broken emit when `Infinity` or `‑Infinity` ends up in a type position

  #42905 commented on Jan 24, 2025 • 0 new comments

• Correctly handle generic functions (e.g.: `Object.freeze`) passed as callbacks to generic functions (e.g.: `Array.prototype.map`)

  #42862 commented on Jan 24, 2025 • 0 new comments

• Error when trying to assign a subclass of a base class with generics to `typeof` of that base class

  #41770 commented on Jan 24, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on Jan 24, 2025 • 0 new comments

• In JSDoc @type is not a type declaration, which it is much more like type conversion.

  #39650 commented on Jan 24, 2025 • 0 new comments

• Inconsistent type inference on overloaded function types

  #57351 commented on Jan 24, 2025 • 0 new comments

• Error not issued when global type is an alias of an object type literal

  #57564 commented on Jan 24, 2025 • 0 new comments

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on Jan 24, 2025 • 0 new comments

• Allow tsconfig.json when input files are specified

  #27379 commented on Jan 24, 2025 • 0 new comments

• tsserver should implement the Language Server Protocol

  #39459 commented on Jan 24, 2025 • 0 new comments

• Proposal for merging array or object options in tsconfig file

  #57486 commented on Jan 24, 2025 • 0 new comments

• Native support for PnP

  #35206 commented on Jan 21, 2025 • 0 new comments

• Always look for tsconfig, allow command line to override tsconfig file list

  #49817 commented on Jan 19, 2025 • 0 new comments

• Implement a `@nonnull` JSDoc tag

  #57042 commented on Jan 22, 2025 • 0 new comments

• Fix generic nullable checks

  #59437 commented on Jan 18, 2025 • 0 new comments

• Computed names in declarations files are resolved even when non-literal, preserve computed names when expressions are entity names

  #60052 commented on Jan 23, 2025 • 0 new comments

• Fix to use string literal type in ArrayBuffer's `Symbol.toStringTag`

  #60150 commented on Jan 22, 2025 • 0 new comments

• Fix private properties not being allowed in optional chains

  #60263 commented on Jan 21, 2025 • 0 new comments

• improper declared type cause narrow type not work when its computed type is not union.

  #39114 commented on Jan 24, 2025 • 0 new comments

• "Organize Imports" should adjust specifiers based on preferences

  #58642 commented on Jan 22, 2025 • 0 new comments

• [tsserver] Make "configure excludes" warning more debuggable

  #59681 commented on Jan 22, 2025 • 0 new comments

• Allow specifying exclude as a command line option

  #46005 commented on Jan 22, 2025 • 0 new comments

• Make `satisfies` configurable to allow excess properties in nested values

  #52999 commented on Jan 21, 2025 • 0 new comments

• Include Default Parameter Values in Signature Help

  #16665 commented on Jan 21, 2025 • 0 new comments

• "The inferred type of X cannot be named without a reference to Y" (TS2742) still happens, when working with npm link to link packages manually

  #58914 commented on Jan 21, 2025 • 0 new comments

• Enable `allowJs` with `isolatedDeclarations`

  #58262 commented on Jan 20, 2025 • 0 new comments

• 'identity' modifier to indicate a function's parameter-less returns should be narrowed like a value

  #60948 commented on Jan 20, 2025 • 0 new comments

• Enable type parameter lower-bound syntax

  #14520 commented on Jan 20, 2025 • 0 new comments

• Update Twitter to X in README

  #56546 commented on Jan 20, 2025 • 0 new comments

• Check if path is excluded via watch options before adding watchers during `watchFailedLookupLocationOfNonRelativeModuleResolutions`

  #60814 commented on Jan 20, 2025 • 0 new comments

• Support to method decorator that change the method signature

  #49229 commented on Jan 19, 2025 • 0 new comments

• Allow type narrowing to be specified as always-on or always-off

  #57725 commented on Jan 19, 2025 • 0 new comments

• JSDoc @import not detecting use in @callback

  #58368 commented on Jan 17, 2025 • 0 new comments

• Unexpected "'Type' is declared but its value is never read." error with jsdoc @import syntax

  #60908 commented on Jan 17, 2025 • 0 new comments

• FormData methods should take a Generic

  #43797 commented on Jan 17, 2025 • 0 new comments

• Implicit Symbol.iterator call in for..of loops / spread destructuring doesn't infer `this` generic type parameter

  #38388 commented on Jan 24, 2025 • 0 new comments

• Support Intellisense for string/number literals in a widened union

  #33471 commented on Jan 24, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on Jan 24, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on Jan 24, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on Jan 24, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on Jan 24, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on Jan 24, 2025 • 0 new comments

• disallow comparing to null and undefined unless they are valid cases in strict null mode

  #11920 commented on Jan 24, 2025 • 0 new comments

• [Feature] make generated codes from enum could be minified when not used

  #27604 commented on Jan 24, 2025 • 0 new comments

• Control flow analysis should "work" in unreachable code

  #26914 commented on Jan 24, 2025 • 0 new comments

• import ConstJson from './config.json' as const;

  #32063 commented on Jan 24, 2025 • 0 new comments

• Declare local variable as optional

  #13321 commented on Jan 23, 2025 • 0 new comments

• Add override / noImplicitOverride support for interfaces

  #45136 commented on Jan 23, 2025 • 0 new comments

• Experiment with Parallelized Parsing

  #54256 commented on Jan 23, 2025 • 0 new comments

• Support locally scoped type alias nodes

  #23188 commented on Jan 23, 2025 • 0 new comments

• Sort jsdoc parameter suggestions by argument position

  #20183 commented on Jan 22, 2025 • 0 new comments