4 Pull requests merged by 3 people

• DOM Update 2025-05-02

  #61647 merged May 7, 2025

• docs(lib): add @throws JSDoc for JSON methods

  #61596 merged May 2, 2025

• check usage before declaration for decorators

  #50372 merged May 2, 2025

• arguments should not be allowed in class static block

  #48172 merged May 2, 2025

7 Pull requests opened by 6 people

• Add lib.esnext.sharedmemory

  #61646 opened May 2, 2025

• docs(lib): add @throws JSDoc for BigInt methods and constructor

  #61653 opened May 4, 2025

• Fix unwanted constant comparisons potentially causing bugs

  #61655 opened May 4, 2025

• Avoid resolving source prop type when the target is `unknown`/`any`

  #61660 opened May 5, 2025

• Add configurable maximum hover length

  #61662 opened May 5, 2025

• Fix type variable leaks and cache inconsistencies

  #61668 opened May 7, 2025

• Relate sources to base constraints of mapped type generic indexed accesses

  #61677 opened May 8, 2025

19 Issues closed by 9 people

• Add an option not to use implicit any when I create an empty container (for example [], new Set() or new Map())

  #61638 closed May 9, 2025

• TypeScript doesn't reverse-infer generic constraints from discriminated unions

  #61661 closed May 9, 2025

• Cross-module inference issue: never-returning function doesn't prevent further type checking in async context

  #61649 closed May 9, 2025

• Mishandling of generic parameter in Parameters

  #61675 closed May 8, 2025

• TypeScript erroneously reports unused variable 'toDate'

  #61674 closed May 8, 2025

• check

  #61669 closed May 8, 2025

• Unexpected narrowing of optional fields via Object.entries

  #61650 closed May 6, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250504 vs 5.8.3

  #61658 closed May 6, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250504 vs 5.8.3

  #61657 closed May 6, 2025

• [NewErrors] 5.9.0-dev.20250504 vs 5.8.3

  #61656 closed May 6, 2025

• TypeScript: After moving file into new destination its extensions `declare module '../types' {` are not changing path of module being extending

  #61639 closed May 5, 2025

• string also allows as args in Intl.NumberFormat.format

  #61629 closed May 5, 2025

• Bug: Predicate function does not narrow correctly

  #61652 closed May 4, 2025

• "used before its declaration" errors not reported when variable/enum/class is used as decorator parameter on class member

  #50349 closed May 2, 2025

• `rewriteRelativeImportExtensions` errors on relative import

  #61615 closed May 2, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250427 vs 5.8.3

  #61624 closed May 2, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250427 vs 5.8.3

  #61623 closed May 2, 2025

• [NewErrors] 5.9.0-dev.20250427 vs 5.8.3

  #61622 closed May 2, 2025

• `arguments` should not be allowed class static block

  #48152 closed May 2, 2025

16 Issues opened by 14 people

• With exactOptionalPropertyTypes enabled, returning an object with missing falsy properties is incorrectly allowed

  #61678 opened May 9, 2025

• A contextually-typed signature coming from correlated union can't be assigned back to source of its contextual type

  #61676 opened May 8, 2025

• Typing issue with `extends` keyword

  #61673 opened May 8, 2025

• TextNumber to boolean is error

  #61672 opened May 8, 2025

• public static fields without initializer are removed even with `useDefineForClassFields=true`

  #61671 opened May 8, 2025

• Nullish coalescing operator does not understand cases where at least one operand is guaranteed to not be null, but not which one is not null

  #61670 opened May 8, 2025

• Type variable leak and odd error

  #61667 opened May 7, 2025

• Class method decorators reset the first field.

  #61665 opened May 6, 2025

• Omit JSDoc type directives when emitting type declarations with documentation

  #61664 opened May 6, 2025

• VS Code doesn't show autocomplete for Mongoose MongoDB operators (like $elemMatch, $match,$gte and ...) in JavaScript, while WebStorm does

  #61666 opened May 6, 2025

• Tsserver never picks up a new file

  #61663 opened May 6, 2025

• Support cyclical type inference of self-referential data structures, when subject to some assignability constraints

  #61659 opened May 4, 2025

• Unwanted constant comparisons potentially causing bugs

  #61654 opened May 4, 2025

• Support the `@private` JSDoc directive to exclude private APIs from emitted type declarations

  #61651 opened May 4, 2025

• TypeScript 5.9 Iteration Plan

  #61648 opened May 2, 2025

• require(esm) 'module.exports' interop export name support

  #61645 opened May 2, 2025

62 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.

• Function initializers as properties

  #61636 commented on May 2, 2025 • 3 new comments

• Preserve type parameter constraint in emitted mapped types while preserving their distributivity

  #54759 commented on May 8, 2025 • 1 new comment

• Inconsistent type inference on overloaded function types

  #57351 commented on May 8, 2025 • 0 new comments

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on May 8, 2025 • 0 new comments

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

  #57009 commented on May 8, 2025 • 0 new comments

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

  #53234 commented on May 8, 2025 • 0 new comments

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

  #52313 commented on May 8, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on May 8, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on May 8, 2025 • 0 new comments

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

  #46791 commented on May 8, 2025 • 0 new comments

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

  #43943 commented on May 8, 2025 • 0 new comments

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

  #42905 commented on May 8, 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 May 8, 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 May 8, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on May 8, 2025 • 0 new comments

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

  #39650 commented on May 8, 2025 • 0 new comments

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

  #39114 commented on May 8, 2025 • 0 new comments

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

  #57564 commented on May 8, 2025 • 0 new comments

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on May 8, 2025 • 0 new comments

• Excessive stack depth comparing types with TS 3.2

  #29112 commented on May 8, 2025 • 0 new comments

• Cannot Optionalize Class Getters

  #14417 commented on May 8, 2025 • 0 new comments

• Assigning window.location after 5.8.2 upgrade fails

  #61335 commented on May 8, 2025 • 0 new comments

• [Feature request]type level equal operator

  #48100 commented on May 8, 2025 • 0 new comments

• Support a @nonnull/@nonnullable JSDoc assertion comment

  #23405 commented on May 8, 2025 • 0 new comments

• Exact Types

  #12936 commented on May 9, 2025 • 0 new comments

• Allow nonNullAssertions on possibly-uninitialized auto-typed let variables

  #52483 commented on May 2, 2025 • 0 new comments

• ignore me, testing build stuff

  #55267 commented on May 7, 2025 • 0 new comments

• Support const assertions and unit type const variable references in constant expressions

  #59475 commented on May 7, 2025 • 0 new comments

• Cache mapper instantiations

  #61505 commented on May 6, 2025 • 0 new comments

• Bump github/codeql-action from 3.28.15 to 3.28.16 in the github-actions group

  #61625 commented on May 5, 2025 • 0 new comments

• chore: `string` type also allows as args in Intl.NumberFormat.format

  #61628 commented on May 3, 2025 • 0 new comments

• Module resolution: NodeNext breaks typechecking

  #60561 commented on May 2, 2025 • 0 new comments

• JSDoc `@` in the code block is broken

  #61640 commented on May 2, 2025 • 0 new comments

• Confusing error message when there is an accidental circular reference in monorepo

  #61577 commented on May 2, 2025 • 0 new comments

• "Extract..." refactorings not available on right side of addition/multiplication expression

  #61630 commented on May 2, 2025 • 0 new comments

• Invalid quick fix for function returning `Promise<unknown>` with `isolatedDeclarations`

  #61642 commented on May 2, 2025 • 0 new comments

• Type narrowing not working for unions of tuples with object literals

  #31613 commented on May 3, 2025 • 0 new comments

• Instantiation expressions don't filter signatures with non-matching constraints

  #51694 commented on May 4, 2025 • 0 new comments

• `@ts-nocheck` and `@ts-ignore` should also disable suggestions

  #47315 commented on May 4, 2025 • 0 new comments

• Invalid quick fix for class that's exported as a variable with `isolatedDeclarations`

  #61644 commented on May 5, 2025 • 0 new comments

• Generic values

  #17574 commented on May 5, 2025 • 0 new comments

• Suggest @ts-expect-error as Quick Fix

  #59934 commented on May 5, 2025 • 0 new comments

• ServiceWorkerRegistration.Update() should return Promise<ServiceWorkerRegistration>

  #31502 commented on May 6, 2025 • 0 new comments

• Allow async functions to return union type T | Promise<T>

  #33595 commented on May 6, 2025 • 0 new comments

• tsconfig.json option removeComments removes comments from both declaration.d.ts and source .js files, it would be convenient to only remove comments from .js files.

  #45187 commented on May 6, 2025 • 0 new comments

• Autocomplete on extends keyof generic

  #28662 commented on May 6, 2025 • 0 new comments

• move to new file not working

  #61632 commented on May 6, 2025 • 0 new comments

• Proposal: Make base class expressions able to access class type parameters

  #36406 commented on May 7, 2025 • 0 new comments

• Allow base class expressions to reference class type parameters as long as the type param is not used on the static side of the resulting class

  #55972 commented on May 7, 2025 • 0 new comments

• source.organizeImports affects export object

  #61588 commented on May 7, 2025 • 0 new comments

• @deprecated strikethrough doesn't appear in many cases, such as JSX elements, const arrow functions, or properties.

  #39374 commented on May 7, 2025 • 0 new comments

• Intersection type in template literal is not reduced to its bare type

  #57918 commented on May 8, 2025 • 0 new comments

• `Element.getElementsByTagName` marked as deprecated

  #61264 commented on May 8, 2025 • 0 new comments

• tsc --init update 2024

  #58420 commented on May 8, 2025 • 0 new comments

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

  #11920 commented on May 8, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on May 8, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on May 8, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on May 8, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on May 8, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on May 8, 2025 • 0 new comments

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

  #33471 commented on May 8, 2025 • 0 new comments

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

  #38388 commented on May 8, 2025 • 0 new comments