1 Release published by 1 person

• v5.9-beta TypeScript 5.9 Beta

  published Jul 8, 2025

2 Pull requests merged by 2 people

• Clear out checker-level stacks on pop

  #62016 merged Jul 8, 2025

• Fix for Issue 61081

  #61221 merged Jul 7, 2025

6 Pull requests opened by 4 people

• Don't defer index types for non-generic substitution types

  #61999 opened Jul 6, 2025

• Bump github/codeql-action from 3.29.1 to 3.29.2 in the github-actions group

  #62006 opened Jul 7, 2025

• Fix diagnostic code 69010 typo to 6910

  #62007 opened Jul 7, 2025

• Add approximatelySign to NumberFormatPartTypeRegistry for ES2023

  #62013 opened Jul 7, 2025

• Force inclusion of ES6, DOM.Iterable

  #62025 opened Jul 9, 2025

• Fix JSDoc @import crashes in getCompletionEntryDetails

  #62028 opened Jul 9, 2025

23 Issues closed by 8 people

• "Typescript: Remove unused imports" does not take into consideration if an import is valid or not

  #62017 closed Jul 10, 2025

• Feature request: Allow to combine default type import with named imports

  #61972 closed Jul 10, 2025

• Not showing imports in `Quick Fix` suggestions

  #62012 closed Jul 10, 2025

• BUG: Tags syntax highlighting in `React` components doesnt work for components that have `children`

  #62015 closed Jul 10, 2025

• constraint causes too specific generic type inference

  #61989 closed Jul 10, 2025

• `NaN && 1` gets incorrectly typed as `0 | 1`

  #61988 closed Jul 10, 2025

• Abstract Members Not Properly Validated in Multiple Mixin Composition

  #62014 closed Jul 10, 2025

• Enable to infer the parameter's type correctly in this case. Why?

  #62026 closed Jul 9, 2025

• JS/TS language service crashes & endless “Analyzing…” / formatter-hang due to Copilot-Chat watcher storm (vscode-chat-code-block paths)

  #61985 closed Jul 9, 2025

• Release notes for 5.8.3 link to nonexistent milestone

  #62020 closed Jul 8, 2025

• Unable to use the rename symbol option - exception thrown

  #61984 closed Jul 7, 2025

• Array.splice "deleteCount" argument description is somewhat insufficient

  #61081 closed Jul 7, 2025

• Allow `rewriteRelativeImportExtensions` to be used with import `paths` aliases

  #61991 closed Jul 7, 2025

• Typescript problems won't update after removing folder with typescript project

  #62010 closed Jul 7, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250706 vs 5.8.3

  #62005 closed Jul 7, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250706 vs 5.8.3

  #62004 closed Jul 7, 2025

• [NewErrors] 5.9.0-dev.20250706 vs 5.8.3

  #62002 closed Jul 7, 2025

• Test ticket for A2A protocol

  #61998 closed Jul 7, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250629 vs 5.8.3

  #61970 closed Jul 7, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250629 vs 5.8.3

  #61969 closed Jul 7, 2025

• [NewErrors] 5.9.0-dev.20250629 vs 5.8.3

  #61968 closed Jul 7, 2025

• Incorrect `expected expression, got '.'` error

  #62003 closed Jul 6, 2025

• `rootDirs` / `outDir` options behaviour change depending on files

  #62001 closed Jul 6, 2025

12 Issues opened by 11 people

• Incorrect `any` displayed in type with noErrorTruncation: true

  #62032 opened Jul 9, 2025

• Shouldn't TypeScript be able to polyfill `import defer` with `Proxy` to work with `"module": "commonjs"`?

  #62031 opened Jul 9, 2025

• JSDoc `@import` causes `getCompletionEntryDetails` to crash

  #62027 opened Jul 9, 2025

• Deprioritise properties of the form `{ prop?: never }` in completions

  #62024 opened Jul 9, 2025

• Function signature overload with rest parameter: TS picks the wrong signature

  #62019 opened Jul 8, 2025

• Improve inference of return types of generic functions.

  #62018 opened Jul 7, 2025

• Support `@import` JSDoc tag for auto-imports

  #62008 opened Jul 7, 2025

• Function signature overload with rest parameter : TS picks the wrong signature when called with argument `any[]`

  #62000 opened Jul 6, 2025

• importing merged declorations in js files

  #61997 opened Jul 5, 2025

• VSCode not respecting declaration map without absolute sourceRoot

  #62009 opened Jul 5, 2025

• Inconsistent behavior with Generic ElementType

  #61995 opened Jul 3, 2025

• `export let` variable doesn't require the variable to be assigned within current file

  #61994 opened Jul 3, 2025

69 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.

• Check expression operand equivalence in isMatchingReference before computing property key equivalence

  #61608 commented on Jul 7, 2025 • 1 new comment

• Add the type of Intl.DurationFormat to the lib.

  #60646 commented on Jul 3, 2025 • 1 new comment

• Defer checking of class static blocks

  #59607 commented on Jul 3, 2025 • 1 new comment

• Compiler Option typeTruncationLength

  #59035 commented on Jul 9, 2025 • 0 new comments

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on Jul 9, 2025 • 0 new comments

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

  #57564 commented on Jul 9, 2025 • 0 new comments

• Inconsistent type inference on overloaded function types

  #57351 commented on Jul 9, 2025 • 0 new comments

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on Jul 9, 2025 • 0 new comments

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

  #57009 commented on Jul 9, 2025 • 0 new comments

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

  #53234 commented on Jul 9, 2025 • 0 new comments

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

  #52313 commented on Jul 9, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on Jul 9, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on Jul 9, 2025 • 0 new comments

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

  #46791 commented on Jul 9, 2025 • 0 new comments

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

  #43943 commented on Jul 9, 2025 • 0 new comments

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

  #42905 commented on Jul 9, 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 Jul 9, 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 Jul 9, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on Jul 9, 2025 • 0 new comments

• tsconfig.json "lib": "dom" should include "dom.iterable"(?)

  #60959 commented on Jul 9, 2025 • 0 new comments

• TypeScript: 3 connected together BUGS in `Refactor: move to file`

  #62022 commented on Jul 9, 2025 • 0 new comments

• Support `satisfies` in type declaration

  #52222 commented on Jul 9, 2025 • 0 new comments

• VS Code removes trailing comma in export statement

  #62030 commented on Jul 9, 2025 • 0 new comments

• Inlay hints will be disabled after extending constructor function in Mixin Implementation using Typescript

  #62023 commented on Jul 9, 2025 • 0 new comments

• Move to File and Move to new File not working to React components

  #62029 commented on Jul 9, 2025 • 0 new comments

• Custom JSDoc type cannot be extended

  #62021 commented on Jul 9, 2025 • 0 new comments

• 6.0 Deprecation Candidates

  #54500 commented on Jul 9, 2025 • 0 new comments

• Comment like jsx text emitted twice when preserve enabled

  #61860 commented on Jul 9, 2025 • 0 new comments

• Type annotation for all exports in the module

  #38511 commented on Jul 9, 2025 • 0 new comments

• Typeguards with destructuring parameters

  #28311 commented on Jul 9, 2025 • 0 new comments

• Allow `this` in constructor parameter

  #38038 commented on Jul 10, 2025 • 0 new comments

• Fixed an issue with intersected abstract properties not requiring to be implemented

  #56751 commented on Jul 7, 2025 • 0 new comments

• Suggest completions for type arguments of expressions

  #61758 commented on Jul 3, 2025 • 0 new comments

• Fix incorrect type declarations for constants inside namespaces merged with enums

  #61946 commented on Jul 10, 2025 • 0 new comments

• Fixed `anyFunctionType` leak

  #61980 commented on Jul 7, 2025 • 0 new comments

• Allow type annotation on catch clause variable

  #20024 commented on Jul 7, 2025 • 0 new comments

• (not) Deprecating `--rootDirs`

  #61885 commented on Jul 7, 2025 • 0 new comments

• NumberFormatPartTypeRegistry doesn't have approximatelySign in it

  #61960 commented on Jul 7, 2025 • 0 new comments

• Missing errors in generic functions in context-sensitive arguments

  #61979 commented on Jul 7, 2025 • 0 new comments

• Type '`x.y.${Name}`' does not satisfy the constraint '`${string}.${Name}`'.(2344)

  #61990 commented on Jul 7, 2025 • 0 new comments

• Unexpected circularity error when variable is initialized from a class member

  #61606 commented on Jul 7, 2025 • 0 new comments

• The parsing problem of the compiler under specific syntax combinations

  #61975 commented on Jul 7, 2025 • 0 new comments

• Disable formatting a region of code using directives

  #18261 commented on Jul 7, 2025 • 0 new comments

• Diagnostic code `69010` may be typo of `6910`?

  #61971 commented on Jul 7, 2025 • 0 new comments

• `@experimental` JSDoc tag, with strikethrough style (or similar) like `@deprecated` JSDoc tag

  #56808 commented on Jul 7, 2025 • 0 new comments

• [isolatedDeclarations] Optional parameter properties are unnecessarily disallowed in isolatedDeclarations mode

  #61501 commented on Jul 7, 2025 • 0 new comments

• Allow for optional index signatures (for the sake of `exactOptionalPropertyTypes`)

  #46969 commented on Jul 6, 2025 • 0 new comments

• Different types based on visibility

  #43553 commented on Jul 6, 2025 • 0 new comments

• Function should be assignable to (...args: any[]) => any

  #20007 commented on Jul 5, 2025 • 0 new comments

• Incorrect type declarations for a constant inside a namespace merged with an enum

  #61944 commented on Jul 4, 2025 • 0 new comments

• Completions for type arguments of expressions

  #61751 commented on Jul 3, 2025 • 0 new comments

• TypeScript class method decorator not rendering properly in version >= 1.63.2

  #47679 commented on Jul 3, 2025 • 0 new comments

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

  #39650 commented on Jul 9, 2025 • 0 new comments

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

  #39114 commented on Jul 9, 2025 • 0 new comments

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

  #38388 commented on Jul 9, 2025 • 0 new comments

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

  #33471 commented on Jul 9, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on Jul 9, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on Jul 9, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on Jul 9, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on Jul 9, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on Jul 9, 2025 • 0 new comments

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

  #11920 commented on Jul 9, 2025 • 0 new comments

• Ignore non-ts/js files in move to file refactor

  #56749 commented on Jul 9, 2025 • 0 new comments

• @types dependency resolution can reference incorrect version

  #59173 commented on Jul 8, 2025 • 0 new comments

• Enum const members set to -0 get compiled into 0

  #61993 commented on Jul 8, 2025 • 0 new comments

• TypeScript 5.9 Iteration Plan

  #61648 commented on Jul 8, 2025 • 0 new comments

• add a modifier for pure functions

  #7770 commented on Jul 8, 2025 • 0 new comments

• Missing constraint error in instantiation expression for a nested class

  #61982 commented on Jul 8, 2025 • 0 new comments

• Autocomplete Filepath Strings.

  #42054 commented on Jul 7, 2025 • 0 new comments