4 Pull requests merged by 4 people

• LEGO: Pull request from lego/hb_5378966c-b857-470a-8675-daebef4a6da1_20250714192406710 to main

  #62068 merged Jul 22, 2025

• Don't use noErrorTruncation when printing types with maximumLength set

  #62091 merged Jul 22, 2025

• Remove unused and confusing dom.iterable.d.ts file

  #62037 merged Jul 21, 2025

• Restore AbortSignal.abort

  #62086 merged Jul 17, 2025

7 Pull requests opened by 5 people

• Don't inherit JSDocs from unrelated base properties onto constructor parameters with the same names

  #62077 opened Jul 15, 2025

• Fix optional property quick info showing redundant '| undefined'

  #62084 opened Jul 16, 2025

• fix: tsconfig `extends` supporting same extensions (inc `.jsonc`) for relative and package imports (bug #43121)

  #62092 opened Jul 19, 2025

• Combine inferences from distributive conditional types

  #62093 opened Jul 20, 2025

• Change `export =` structurally to allow other exported elements in the same file

  #62103 opened Jul 22, 2025

• Don't emit redundant and invalid extra renamed keyword exports in JS files

  #62104 opened Jul 22, 2025

• AI Diagnostics: Enforce Centralized Type Registry and Actionable Type Hygiene Fixes

  #62107 opened Jul 22, 2025

36 Issues closed by 7 people

• Namespaces not merged from UMD globals

  #9329 closed Jul 22, 2025

• Module augmentation with export list

  #9127 closed Jul 22, 2025

• Exported ambient variables are neither emitted nor an error

  #8015 closed Jul 22, 2025

• Why do multiple ES6 imports compile to multiple requires / define() deps with suffixed names?

  #6137 closed Jul 22, 2025

• Handle default constructor when extending null

  #4048 closed Jul 22, 2025

• Invalid combinations of --out, --outDir, and --rootDir should cause a compiler error.

  #3305 closed Jul 22, 2025

• Assignment of string literal indexed enum member passes compilation but results in invalid javascript

  #2215 closed Jul 22, 2025

• Some comments not emitted - upgrade 1.0.1 to 1.3.0

  #1311 closed Jul 22, 2025

• Improve error messages for duplicate identifiers

  #529 closed Jul 22, 2025

• Give better error messages down the line when generic merged interfaces have different type parameters

  #6248 closed Jul 22, 2025

• Assignability error reporting should have a more specific error for unions

  #6541 closed Jul 22, 2025

• Emitted extends clause should come after deatched-comment at the top of the file

  #7038 closed Jul 22, 2025

• WebWorker and dom lib does not support transfers in the type for postMessage

  #12657 closed Jul 22, 2025

• Incorrect type definition for "ErrorEvent" in "lib.es6.d.ts"

  #12666 closed Jul 22, 2025

• User-defined type guard method can be overridden with any non-type-guard return type

  #27687 closed Jul 22, 2025

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

  #62032 closed Jul 22, 2025

• Efikcoin staking core

  #62096 closed Jul 21, 2025

• No way to restrict object/Record keys to unique Symbols

  #62100 closed Jul 21, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250720 vs 5.8.3

  #62099 closed Jul 21, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250720 vs 5.8.3

  #62098 closed Jul 21, 2025

• [NewErrors] 5.9.0-dev.20250720 vs 5.8.3

  #62097 closed Jul 21, 2025

• Controlled runtime inference for trusted pure functions (secureInference)

  #62088 closed Jul 21, 2025

• CFA doesn't see non executable code

  #15089 closed Jul 20, 2025

• strictNullChecks false-positive when returning or breaking from within loop

  #14143 closed Jul 20, 2025

• 5.9-beta regression, Effect-TS's Effect result typed as any

  #62090 closed Jul 19, 2025

• Covariance in intersection

  #62049 closed Jul 19, 2025

• Suggestion: add excludeTypeRoots to tsconfig

  #62089 closed Jul 18, 2025

• Changing or reloading the current page via location should cause unreachable code error

  #62073 closed Jul 18, 2025

• Linter didn't detect { [x: string]: any; }[] !== { [x: string]: any; }

  #62087 closed Jul 17, 2025

• Global classes allow `globalThis.ClassName` but not `typeof globalThis.ClassName`

  #62078 closed Jul 17, 2025

• Error: Debug Failure. False expression.

  #52952 closed Jul 17, 2025

• Implicit `this` parameter bypasses assignability checks with derived methods

  #62055 closed Jul 17, 2025

• Unexpected behavior of enum keys while evaluating mapped types

  #62051 closed Jul 17, 2025

• Missing parser error for arguments in class field

  #62062 closed Jul 17, 2025

• Typesafety violation

  #62043 closed Jul 17, 2025

• `configFileName` on `ProjectInfo` returns `projectName` which is inconsistent with commented behavior

  #62082 closed Jul 16, 2025

10 Issues opened by 10 people

• Unexpected type collapse of union type at const initialization

  #62108 opened Jul 22, 2025

• If I have multi-group character mode to create responsible objects, I want to define multi-group dynamic keys

  #62106 opened Jul 22, 2025

• Typescript error because nested value might be null even after I check it's not null

  #62105 opened Jul 22, 2025

• Adding a space after the string literal in a computed property name causes an incorrect hover display

  #62101 opened Jul 21, 2025

• Spread operator allows invalid return type in record data types

  #62095 opened Jul 20, 2025

• [isolatedDeclarations] function expressions as an argument to a function call that is exported are reported as needing an annotation

  #62085 opened Jul 17, 2025

• Google feedback on TS 5.9-beta

  #62083 opened Jul 16, 2025

• `export { _void as void }` leads to exporting duplicate identifiers

  #62081 opened Jul 16, 2025

• [tsserver] Multi-project goto definition with accurate results

  #62080 opened Jul 16, 2025

• Unable to infer parameters for generic constructor/functions with a distributive conditional type

  #62079 opened Jul 16, 2025

63 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.

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

  #62006 commented on Jul 21, 2025 • 2 new comments

• Fix switch-true case-true narrowing to behave equivalently to default case

  #59459 commented on Jul 18, 2025 • 2 new comments

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

  #53234 commented on Jul 22, 2025 • 0 new comments

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

  #52313 commented on Jul 22, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on Jul 22, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on Jul 22, 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 22, 2025 • 0 new comments

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

  #43943 commented on Jul 22, 2025 • 0 new comments

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

  #42905 commented on Jul 22, 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 22, 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 22, 2025 • 0 new comments

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

  #39650 commented on Jul 22, 2025 • 0 new comments

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

  #39114 commented on Jul 22, 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 22, 2025 • 0 new comments

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

  #33471 commented on Jul 22, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on Jul 22, 2025 • 0 new comments

• Bug: string is not a string

  #60764 commented on Jul 16, 2025 • 0 new comments

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

  #57009 commented on Jul 22, 2025 • 0 new comments

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on Jul 22, 2025 • 0 new comments

• Inconsistent type inference on overloaded function types

  #57351 commented on Jul 22, 2025 • 0 new comments

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

  #57564 commented on Jul 22, 2025 • 0 new comments

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on Jul 22, 2025 • 0 new comments

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

  #31613 commented on Jul 22, 2025 • 0 new comments

• Typescript crashes in VS Code insiders latest build with all extensions disabled and TypeScript Nightly extension

  #52353 commented on Jul 22, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on Jul 22, 2025 • 0 new comments

• Support closed-file diagnostics in VS Code

  #36664 commented on Jul 22, 2025 • 0 new comments

• `as enum` assertion for object literals

  #60790 commented on Jul 22, 2025 • 0 new comments

• Add math intrinsic types

  #48198 commented on Jul 19, 2025 • 0 new comments

• Fix private properties not being allowed in optional chains

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

• Don't compare "missing" to `undefined` in `compareProperties` under `exactOptionalPropertyTypes`

  #61683 commented on Jul 21, 2025 • 0 new comments

• Fix JSDoc @import crashes in getCompletionEntryDetails

  #62028 commented on Jul 16, 2025 • 0 new comments

• Fix JSDoc typeof parameter resolution

  #62053 commented on Jul 21, 2025 • 0 new comments

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

  #48212 commented on Jul 16, 2025 • 0 new comments

• Property does not exist on `globalThis` immediately after declaring it

  #39504 commented on Jul 16, 2025 • 0 new comments

• Intl.Collator#compare method type does not match spec

  #62048 commented on Jul 16, 2025 • 0 new comments

• Show unused public properties and methods

  #29293 commented on Jul 16, 2025 • 0 new comments

• JSON modules without "allowSyntheticDefaultImports"

  #47862 commented on Jul 16, 2025 • 0 new comments

• TypeScript 5.9 Iteration Plan

  #61648 commented on Jul 16, 2025 • 0 new comments

• ES6 modules cannot use "await" as an identifier

  #8559 commented on Jul 17, 2025 • 0 new comments

• Generic functon doesn't resolve type property when accept this as a parameter ?

  #16791 commented on Jul 17, 2025 • 0 new comments

• Disable formatting a region of code using directives

  #18261 commented on Jul 17, 2025 • 0 new comments

• [FR] `"javascript/typescript.preferences.importModuleSpecifier": "no-relative-parent-imports"`

  #54955 commented on Jul 17, 2025 • 0 new comments

• No narrowing on assert.strictEqual()

  #48244 commented on Jul 17, 2025 • 0 new comments

• Disable type checking for node_modules entirely

  #40426 commented on Jul 18, 2025 • 0 new comments

• disable certain global types for specific files, or specify type roots for specific files.

  #37053 commented on Jul 18, 2025 • 0 new comments

• JSDoc export type support

  #48104 commented on Jul 18, 2025 • 0 new comments

• Allow users to customize the variance of built-in `Array`

  #52621 commented on Jul 18, 2025 • 0 new comments

• T | (() => T)

  #37663 commented on Jul 19, 2025 • 0 new comments

• tsconfig should support suffix `.jsonc`

  #43121 commented on Jul 19, 2025 • 0 new comments

• export default type

  #41409 commented on Jul 19, 2025 • 0 new comments

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

  #20007 commented on Jul 20, 2025 • 0 new comments

• Trade-offs in Control Flow Analysis

  #9998 commented on Jul 21, 2025 • 0 new comments

• TypeScript does not recognize unreachable code after a method returning never is called outside of its defining scope

  #59138 commented on Jul 21, 2025 • 0 new comments

• HTMLElement inherits onerror and addListener("error" definitions that are unique to Window

  #62075 commented on Jul 21, 2025 • 0 new comments

• Suggestion: make `RequestInit.method` suggest standard verbs

  #61129 commented on Jul 21, 2025 • 0 new comments

• [TypeScript] Rename Symbol doesn't work as expected with Declaration Merging

  #62065 commented on Jul 21, 2025 • 0 new comments

• JSX: Add a way to specify children as not a part of props

  #18357 commented on Jul 21, 2025 • 0 new comments

• Hover documentation for typescript uses jsdoc rules and not tsdoc

  #61603 commented on Jul 22, 2025 • 0 new comments

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

  #11920 commented on Jul 22, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on Jul 22, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on Jul 22, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on Jul 22, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on Jul 22, 2025 • 0 new comments