8 Pull requests merged by 4 people

• Fix errors on type assertions in erasableSyntaxOnly

  #61452 merged Mar 19, 2025

• 🤖 Pick PR #61452 (Fix errors on type assertions in er...) into release-5.8

  #61453 merged Mar 19, 2025

• 🤖 Pick PR #61261 (Fixed accidentally reused comments ...) into release-5.8

  #61290 merged Mar 19, 2025

• 🤖 Pick PR #61342 (Rename type parameters when they ar...) into release-5.8

  #61345 merged Mar 19, 2025

• 🤖 Pick PR #61244 (Ban old-style type assertions under...) into release-5.8

  #61320 merged Mar 19, 2025

• 🤖 Pick PR #61392 (Fix serialization of accessor types...) into release-5.8

  #61423 merged Mar 19, 2025

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

  #60921 merged Mar 17, 2025

• Fix serialization of accessor types in declaration files.

  #61392 merged Mar 14, 2025

5 Pull requests opened by 5 people

• Implement erasable Enum Annotations

  #61414 opened Mar 13, 2025

• Sort symbol members

  #61420 opened Mar 14, 2025

• Fix to aggressive indentation for ternary operator #3676

  #61430 opened Mar 15, 2025

• Add types for `String.{matchAll,replaceAll}` with a well known symbol

  #61449 opened Mar 19, 2025

• Ban non-ambient modules written with `module` keyword

  #61450 opened Mar 19, 2025

19 Issues closed by 14 people

• Incorrect narrowing of boolean type when variable is mutated in a timer

  #61445 closed Mar 18, 2025

• TS2551: Property XXX does not exist on type

  #61442 closed Mar 18, 2025

• Cannot find namespace 'config' or File '.../types.ts' is not a module.

  #61444 closed Mar 18, 2025

• JSDoc @import not detecting use in @callback

  #58368 closed Mar 17, 2025

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

  #60908 closed Mar 17, 2025

• dynamic import from module=none of an module=es2022 via barrel reemits it as commonjs

  #61316 closed Mar 17, 2025

• Omit Type

  #61408 closed Mar 17, 2025

• Array.isArray( ) with readonly []

  #61381 closed Mar 17, 2025

• CFA does not consider pass-by-reference to invalidate assumptions

  #61416 closed Mar 16, 2025

• TC39 Accessor Decorators unable to use `declare`

  #61418 closed Mar 14, 2025

• Still only the last overloaded signature is picked when passing an overloaded function to Array.map

  #61398 closed Mar 14, 2025

• Unresolved generic type arguments end up in type declarations since 5.7.2

  #61338 closed Mar 14, 2025

• Unbound type parameter in declaration files for accessors with divergent types.

  #61391 closed Mar 14, 2025

• Unreachable code breaks subsequent CFA

  #61419 closed Mar 14, 2025

• Inferred types for named capture groups in RegExp

  #61413 closed Mar 13, 2025

• `ReadableStreamGenericReader` is incompatible with @types/node

  #61390 closed Mar 13, 2025

• Api to Copilot

  #61412 closed Mar 13, 2025

• Array access possibly undefined with noUncheckedIndexedAccess despite findIndex

  #61388 closed Mar 13, 2025

• Unexpected "property is not assignable to type 'undefined'" on dynamic assignment

  #61409 closed Mar 12, 2025

26 Issues opened by 24 people

• tsserver go to definition doesn't work as expected when `disableSourceOfProjectReferenceRedirect` is enabled

  #61451 opened Mar 19, 2025

• Add types for `String.{matchAll,replaceAll}` with a well known symbol

  #61448 opened Mar 19, 2025

• TypeScript 5.5+ declaration of AbortSignal conflicts with Node.js v14 types

  #61447 opened Mar 19, 2025

• `T` is not assignable to `SomeType | Exclude<T, SomeType>` where `T` is a generic union type

  #61446 opened Mar 19, 2025

• Type alias circularly references itself

  #61443 opened Mar 18, 2025

• Allow `import.meta.url` when `module` is `node16` or `node18`

  #61441 opened Mar 17, 2025

• ts will try to compile import files from a folder without reference or include

  #61440 opened Mar 17, 2025

• I triggered the Debug assertion `Revert #54442 and add a testcase with whatever triggered this` when running with `--diagnostics`

  #61438 opened Mar 17, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250316 vs 5.8.2

  #61437 opened Mar 16, 2025

• Type Conversion Error with Empty and Non-Empty Generic Types in Record Mapping

  #61436 opened Mar 16, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250316 vs 5.8.2

  #61435 opened Mar 16, 2025

• `T?` shortcut for `T | undefined`

  #61434 opened Mar 16, 2025

• Support fuzzy search for "Go to Symbol in Workspace" for Javascript/Typescript

  #61439 opened Mar 16, 2025

• `{@link Class.name}` resolves wrongly to `Function.name`

  #61433 opened Mar 16, 2025

• [NewErrors] 5.9.0-dev.20250316 vs 5.8.2

  #61432 opened Mar 16, 2025

• Strange error message when accessing undefined property of an enum

  #61431 opened Mar 16, 2025

• Arithmetic operations on type-parameters subtyping `bigint` are incorrectly inferred to have type `number`

  #61429 opened Mar 15, 2025

• Iteration Plan for 5.9?

  #61428 opened Mar 15, 2025

• Provide a core types Type (result of typeof)

  #61427 opened Mar 15, 2025

• Intellisense: deprioritise native function methods

  #61426 opened Mar 15, 2025

• Class implementing interface implicit types

  #61425 opened Mar 14, 2025

• Potentially-`undefined` value not flagged when destructuring union of empty tuple and array

  #61424 opened Mar 14, 2025

• Typescript compiler hangs indefinitely

  #61422 opened Mar 14, 2025

• Using intersection types breaks type inference for function types

  #61417 opened Mar 13, 2025

• Allow tuple labels passed to `satisfies` to participate in type inference

  #61415 opened Mar 13, 2025

• Missing compiler error (or emit bug) in another isolatedModules + emitDecoratorMetadata use case

  #61411 opened Mar 13, 2025

65 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.

• fix(61258): Renaming namespace with const enum doesn't update enum references

  #61263 commented on Mar 18, 2025 • 4 new comments

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on Mar 19, 2025 • 0 new comments

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

  #57564 commented on Mar 19, 2025 • 0 new comments

• Inconsistent type inference on overloaded function types

  #57351 commented on Mar 19, 2025 • 0 new comments

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on Mar 19, 2025 • 0 new comments

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

  #53234 commented on Mar 19, 2025 • 0 new comments

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

  #57009 commented on Mar 19, 2025 • 0 new comments

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

  #52313 commented on Mar 19, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on Mar 19, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on Mar 19, 2025 • 0 new comments

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

  #46791 commented on Mar 19, 2025 • 0 new comments

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

  #43943 commented on Mar 19, 2025 • 0 new comments

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

  #42905 commented on Mar 19, 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 Mar 19, 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 Mar 19, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on Mar 19, 2025 • 0 new comments

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

  #39114 commented on Mar 19, 2025 • 0 new comments

• require() is generated in JS although there's no runtime code

  #61395 commented on Mar 19, 2025 • 0 new comments

• Disable type checking for node_modules entirely

  #40426 commented on Mar 19, 2025 • 0 new comments

• Module "..." cannot be named without a reference to "..." error when decl emitting references to nested modules

  #48212 commented on Mar 19, 2025 • 0 new comments

• Missing controlsList property in HTMLMediaElement

  #31532 commented on Mar 19, 2025 • 0 new comments

• refactor: New file generates import from wrong module specifier

  #58897 commented on Mar 19, 2025 • 0 new comments

• Add allowImportingJsExtensions option to prevent incorrect .js imports

  #61371 commented on Mar 19, 2025 • 0 new comments

• get property return type inferred incorrectly from 'this' type, when other methods exist

  #61361 commented on Mar 19, 2025 • 0 new comments

• Union type on object's property behaves different than having a union of the whole object with all possible values for this field

  #61202 commented on Mar 19, 2025 • 0 new comments

• Support source phase imports

  #61216 commented on Mar 19, 2025 • 0 new comments

• Talk about Exceptions Here

  #56365 commented on Mar 19, 2025 • 0 new comments

• Negated types

  #4196 commented on Mar 19, 2025 • 0 new comments

• New `--enforceReadonly` compiler option to enforce read-only semantics in type relations

  #58296 commented on Mar 13, 2025 • 0 new comments

• Make TypeScript itself ESM-only, made possible by require(ESM)

  #58419 commented on Mar 19, 2025 • 0 new comments

• Fix #61098

  #61113 commented on Mar 19, 2025 • 0 new comments

• Use comparability for discriminant properties when narrowing types for a default switch clause

  #61211 commented on Mar 12, 2025 • 0 new comments

• Sort unions without using type IDs

  #61399 commented on Mar 14, 2025 • 0 new comments

• Suggestion: Reopen static and instance side of classes

  #2957 commented on Mar 16, 2025 • 0 new comments

• Allow "T extends enum" generic constraint

  #30611 commented on Mar 16, 2025 • 0 new comments

• Polymorphic "this" for static members

  #5863 commented on Mar 14, 2025 • 0 new comments

• Unreliably report for unused local variable in the editor

  #61403 commented on Mar 14, 2025 • 0 new comments

• "Debug Failure. False expression." when using default export from js file

  #60692 commented on Mar 14, 2025 • 0 new comments

• Inconsistent errors reported between tsc and VSCode (Unions across objects with method overload definitions)

  #53614 commented on Mar 14, 2025 • 0 new comments

• Higher order type inference doesn't work with overloads

  #33594 commented on Mar 14, 2025 • 0 new comments

• The terms in the Refactor menu are not internationalized.

  #61374 commented on Mar 14, 2025 • 0 new comments

• Order member intellisense by inheritance

  #37362 commented on Mar 14, 2025 • 0 new comments

• Feature request: allow user to merge extended arrays in tsconfig files

  #20110 commented on Mar 13, 2025 • 0 new comments

• Exact Types

  #12936 commented on Mar 13, 2025 • 0 new comments

• @ts-ignore for the block scope and imports

  #19573 commented on Mar 13, 2025 • 0 new comments

• allow decorators for functions

  #7318 commented on Mar 13, 2025 • 0 new comments

• TypeScript 5.6 Iteration Plan

  #59250 commented on Mar 13, 2025 • 0 new comments

• “Type instantiation is excessively deep and possibly infinite” but only in a large codebase

  #34933 commented on Mar 13, 2025 • 0 new comments

• Assigning window.location after 5.8.2 upgrade fails

  #61335 commented on Mar 13, 2025 • 0 new comments

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

  #39650 commented on Mar 19, 2025 • 0 new comments

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

  #38388 commented on Mar 19, 2025 • 0 new comments

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

  #33471 commented on Mar 19, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on Mar 19, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on Mar 19, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on Mar 19, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on Mar 19, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on Mar 19, 2025 • 0 new comments

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

  #11920 commented on Mar 19, 2025 • 0 new comments

• TS Perf degradation since last version upgrade

  #61400 commented on Mar 18, 2025 • 0 new comments

• auto-import with `package.json#imports` does not take `moduleResolution` into account

  #60405 commented on Mar 18, 2025 • 0 new comments

• `transformTime` performance regression since 5.6.x

  #61406 commented on Mar 17, 2025 • 0 new comments

• Request: Class Decorator Mutation

  #4881 commented on Mar 17, 2025 • 0 new comments

• Support Expandable Quick Info/Hover Verbosity

  #59029 commented on Mar 17, 2025 • 0 new comments

• TypeScript 5.8 Iteration Plan

  #61023 commented on Mar 17, 2025 • 0 new comments

• JSDoc unexpected leading whitespace behaviour with `@example` and `<caption>`

  #43955 commented on Mar 16, 2025 • 0 new comments