31 Pull requests merged by 11 people

• fix: diagnostic message for class name 'Object' when targeting different ECMAScript versions

  #61850 merged Jun 30, 2025

• Fix Copilot instructions to emphasize mandatory lint, test, and format steps

  #61950 merged Jun 30, 2025

• perf: improve regexp performance by using non-capturing groups

  #58551 merged Jun 30, 2025

• Bump the github-actions group across 1 directory with 3 updates

  #61804 merged Jun 30, 2025

• Properly disallow yield in bodyless arrows

  #61976 merged Jun 30, 2025

• Revert change to type print in an error message

  #61977 merged Jun 30, 2025

• Fixed nullish coalesce operator's precedence

  #61372 merged Jun 30, 2025

• Don't return tags when returning quick info for JSDoc nodes

  #59816 merged Jun 30, 2025

• Keep accessors as accessors in emitted anonymous class declarations

  #60853 merged Jun 30, 2025

• Handle silentNeverType in iteration-related functions

  #61317 merged Jun 30, 2025

• Fixed crash when getting a definition for a class member with a computed name and an override modifier

  #60631 merged Jun 30, 2025

• Fixed crash in hasVisibleDeclarations related to binding elements

  #61352 merged Jun 30, 2025

• Fixed a printer crash caused by empty parameter modifiers

  #60537 merged Jun 30, 2025

• Fixed JSDoc display on JsxNamespacedName attributes

  #61825 merged Jun 30, 2025

• Fix typo in nightly yaml

  #61906 merged Jun 30, 2025

• Fixed crash on ComputedPropertyName when computing interactive inlay hints

  #61857 merged Jun 30, 2025

• Improve release publisher pipeline

  #61551 merged Jun 30, 2025

• Fixed crash on ConstructSignature when computing interactive inlay hints

  #61973 merged Jun 30, 2025

• Fix capitalisation for checkJs

  #61795 merged Jun 29, 2025

• Revert #54442 and add a testcase

  #61955 merged Jun 27, 2025

• Use jsx language variant for jsx file scanning in getChildren

  #61928 merged Jun 25, 2025

• Update copilot-setup-steps.yml

  #61948 merged Jun 25, 2025

• Fix BigInt literal error in ambient contexts when targeting < ES2020

  #61935 merged Jun 25, 2025

• Allow accessor properties in ambient contexts when targeting ES5

  #61927 merged Jun 25, 2025

• Add line endings and printf debugging section

  #61947 merged Jun 25, 2025

• Use strict subtype relation in getCommonSupertype

  #61903 merged Jun 24, 2025

• Fix bad JSON syntax in tests, use JSON.parse first for perf

  #61901 merged Jun 24, 2025

• Remove corsa-specific steps from copilot-setup-steps.yml

  #61938 merged Jun 24, 2025

• Update Copilot instructions and setup script

  #61937 merged Jun 24, 2025

• Add Copilot setup steps

  #61933 merged Jun 24, 2025

• Allow trailing commas after import attributes in ImportType

  #61920 merged Jun 24, 2025

6 Pull requests opened by 3 people

• Fix using transform variable shadowing in for-of loops

  #61934 opened Jun 24, 2025

• Unify the way anonymous class symbols are printed in error messages

  #61943 opened Jun 25, 2025

• Fix Symbol completion priority and cursor positioning

  #61945 opened Jun 25, 2025

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

  #61946 opened Jun 25, 2025

• Restructure CI to prepare for required checks and merge queues

  #61978 opened Jun 30, 2025

• Fixed `anyFunctionType` leak

  #61980 opened Jun 30, 2025

36 Issues closed by 11 people

• Diagnostic code `6807` should not be `category: Error`

  #61981 closed Jul 1, 2025

• tsc --init-basic

  #46150 closed Jun 30, 2025

• Error "Class name cannot be 'Object' when targeting ES5 with module CommonJS." when not targeting es5

  #61270 closed Jun 30, 2025

• Fix Copilot instructions to run mandatory steps

  #61949 closed Jun 30, 2025

• Incorrect operator precedence when using private fields with nullish coalescing assignment for targets <= es2021

  #61109 closed Jun 30, 2025

• Manually constructed nullish coalescing AST is missing parentheses when printed

  #61369 closed Jun 30, 2025

• Hovering @param comments duplicates the comment in the hover

  #59402 closed Jun 30, 2025

• Unable to override a getter when inheriting from a mixin class

  #44938 closed Jun 30, 2025

• Getters in mixins get serialized to property accessors

  #58790 closed Jun 30, 2025

• [bug] Auto `accessor` fields are declared as regular properties in mixin abstract classes

  #60672 closed Jun 30, 2025

• Spurious missing `Symbol.iterator` on `never` when `yield*`ing generic call within a generic call

  #61318 closed Jun 30, 2025

• TS 5.8 TypeError: Cannot read properties of undefined (reading 'kind')

  #61351 closed Jun 30, 2025

• JSX `JsxNamespacedName` breaks JSDoc + QuickInfo in VSCode

  #61820 closed Jun 30, 2025

• No inlay hints. provideInlayHints results in Debug Failure. Unexpected node.

  #61845 closed Jun 30, 2025

• Inlay hints are not displayed for certain code

  #61965 closed Jun 30, 2025

• `HTMLIFrameElement.sandbox`'s type should be readonly

  #61974 closed Jun 30, 2025

• Merging Classes With Getters Converts Into a Property

  #61967 closed Jun 30, 2025

• Inconsistent type when using `noUncheckedIndexedAccess`

  #61957 closed Jun 30, 2025

• Multiple `export as namespace` not merging in the same namespace

  #61942 closed Jun 30, 2025

• Generic with nested object incorrectly constraint suggestions in code completion

  #61952 closed Jun 30, 2025

• `PropertyDescriptor` (and `TypedPropertyDescriptor`) should be union of data descriptor and accessor descriptor

  #61966 closed Jun 29, 2025

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

  #61438 closed Jun 27, 2025

• ts plugin provide symbols

  #61929 closed Jun 27, 2025

• Typescript/Javascript doesn't correctly pick up type information when the type is a union with undefined or null

  #61932 closed Jun 27, 2025

• ternary operator causes nonsense with typescript "expression is not callable"

  #61953 closed Jun 26, 2025

• `import.meta.main` support

  #61951 closed Jun 26, 2025

• Distributive generic with extends constraint not assignable to original non-distributed type

  #61866 closed Jun 26, 2025

• Incorrect generic binding of intersection of array types

  #61907 closed Jun 26, 2025

• Add a Serialisable type for the structured clone algorithm

  #61908 closed Jun 26, 2025

• Declaration size optimisation [d.ts]

  #61919 closed Jun 26, 2025

• When there is only one member in the enum declaration, const enum A {x = 1}, the enum type obtained through the getTypeAtLocation interface is incorrect.

  #61917 closed Jun 26, 2025

• "Bigint literals are not available when targeting..." error should not occur in .d.ts files

  #60438 closed Jun 25, 2025

• Allow `accessor` properties in `.d.ts` even when targeting ES5

  #61181 closed Jun 25, 2025

• Lost Symbol Reference in LSP for Inferred Generic

  #61930 closed Jun 25, 2025

• Add `.isApplicableIndexType()` to the `TypeChecker`

  #61886 closed Jun 25, 2025

• Trailing comma in import type attribute should be allowed

  #61916 closed Jun 24, 2025

14 Issues opened by 10 people

• Missing constraint error in instantiation expression for a nested class

  #61982 opened Jul 1, 2025

• Missing errors in generic functions in context-sensitive arguments

  #61979 opened Jun 30, 2025

• The parsing problem of the compiler under specific syntax combinations

  #61975 opened Jun 30, 2025

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

  #61972 opened Jun 30, 2025

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

  #61971 opened Jun 30, 2025

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

  #61970 opened Jun 29, 2025

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

  #61969 opened Jun 29, 2025

• [NewErrors] 5.9.0-dev.20250629 vs 5.8.3

  #61968 opened Jun 29, 2025

• NumberFormatPartTypeRegistry doesn't have approximatelySign in it

  #61960 opened Jun 27, 2025

• Inconsistent lookup/resolution for `typeof` in JSDoc in references search

  #61959 opened Jun 27, 2025

• Autocomplete for overloaded function only suggests first matching signature when discriminant isn't the first field typed

  #61958 opened Jun 27, 2025

• Inconsistent quick info on optional properties when supporting hover verbosity

  #61954 opened Jun 26, 2025

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

  #61944 opened Jun 25, 2025

• Ability for checker to resolve modules by node similar to program when providing custom host

  #61941 opened Jun 24, 2025

71 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.

• Defer checking of class static blocks

  #59607 commented on Jul 1, 2025 • 2 new comments

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

  #59459 commented on Jun 30, 2025 • 1 new comment

• Fix IsolatedDeclarations annotations can duplicate comments

  #61497 commented on Jun 30, 2025 • 1 new comment

• Support trailing commas in `typeof import()`

  #61495 commented on Jun 30, 2025 • 1 new comment

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on Jul 1, 2025 • 0 new comments

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

  #57564 commented on Jul 1, 2025 • 0 new comments

• Inconsistent type inference on overloaded function types

  #57351 commented on Jul 1, 2025 • 0 new comments

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on Jul 1, 2025 • 0 new comments

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

  #57009 commented on Jul 1, 2025 • 0 new comments

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

  #53234 commented on Jul 1, 2025 • 0 new comments

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

  #52313 commented on Jul 1, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on Jul 1, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on Jul 1, 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 1, 2025 • 0 new comments

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

  #43943 commented on Jul 1, 2025 • 0 new comments

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

  #42905 commented on Jul 1, 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 1, 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 1, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on Jul 1, 2025 • 0 new comments

• Disable type checking for node_modules entirely

  #40426 commented on Jun 28, 2025 • 0 new comments

• Disable formatting a region of code using directives

  #18261 commented on Jul 1, 2025 • 0 new comments

• ignore me, testing build stuff

  #55267 commented on Jun 25, 2025 • 0 new comments

• Fix private properties not being allowed in optional chains

  #60263 commented on Jun 30, 2025 • 0 new comments

• Return iterable of RegExpExecArray from RegExp#[Symbol.matchAll]

  #60516 commented on Jul 1, 2025 • 0 new comments

• Remove getNonNullableType application in checkIdentifier

  #60523 commented on Jul 1, 2025 • 0 new comments

• Restore repo dispatch for twoslash-repros workflow

  #60682 commented on Jun 30, 2025 • 0 new comments

• Let properties having primitive types discriminate object unions

  #60718 commented on Jul 1, 2025 • 0 new comments

• Improve how intersections are classified as weak types

  #60889 commented on Jul 1, 2025 • 0 new comments

• Infer from context sensitive return expressions

  #60909 commented on Jun 27, 2025 • 0 new comments

• Fix for Issue 61081

  #61221 commented on Jun 30, 2025 • 0 new comments

• Improve union origin preservation in filtering-unionizing binary expressions

  #61362 commented on Jul 1, 2025 • 0 new comments

• Don't set parent on non-transient symbols in mergeSymbolTable

  #61560 commented on Jun 30, 2025 • 0 new comments

• Add type definitions for `Uint8Array` to/from base64 methods

  #61696 commented on Jun 30, 2025 • 0 new comments

• Type width in error messages

  #61829 commented on Jul 1, 2025 • 0 new comments

• Watch failed lookups, affecting locations only if resolution was failed

  #61861 commented on Jul 1, 2025 • 0 new comments

• Do not set `valueDeclaration` for intersection properties when one symbol does not have a `valueDeclaration`

  #61872 commented on Jul 1, 2025 • 0 new comments

• Support `satisfies` operator on functions

  #51556 commented on Jun 27, 2025 • 0 new comments

• Use the width of a type to add newlines in type assignment error messages

  #45896 commented on Jun 27, 2025 • 0 new comments

• Feature Request: "extends oneof" generic constraint; allows for narrowing type parameters

  #27808 commented on Jun 27, 2025 • 0 new comments

• Imported const enum is not inlined in generated code

  #16671 commented on Jun 27, 2025 • 0 new comments

• move to new file not working

  #61632 commented on Jun 26, 2025 • 0 new comments

• Add ES2025 target and library

  #61735 commented on Jun 26, 2025 • 0 new comments

• Automatic completion, renaming, go to define based on decorator parameters

  #61931 commented on Jun 25, 2025 • 0 new comments

• Annoyingly useless Symbol completions

  #28364 commented on Jun 25, 2025 • 0 new comments

• Allow specifying exclude as a command line option

  #46005 commented on Jun 25, 2025 • 0 new comments

• Emitted declarations for JS file do not import a class if it's re-exported

  #61718 commented on Jun 25, 2025 • 0 new comments

• Property is not assignable to the same property in generic base type

  #61918 commented on Jun 25, 2025 • 0 new comments

• Relate control flow to conditional types in return types

  #33912 commented on Jun 25, 2025 • 0 new comments

• Class member completion crash in a monorepo utilizing `baseUrl`

  #60533 commented on Jun 24, 2025 • 0 new comments

• Preserve computed property in `--isolatedDeclarations` emit

  #61892 commented on Jun 24, 2025 • 0 new comments

• Import type over generic argument

  #31090 commented on Jun 24, 2025 • 0 new comments

• Intellisense: deprioritise native function methods

  #61426 commented on Jun 24, 2025 • 0 new comments

• `using` transform throws when a for body binding shadows the for head binding

  #61714 commented on Jun 24, 2025 • 0 new comments

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

  #39650 commented on Jul 1, 2025 • 0 new comments

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

  #39114 commented on Jul 1, 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 1, 2025 • 0 new comments

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

  #33471 commented on Jul 1, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on Jul 1, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on Jul 1, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on Jul 1, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on Jul 1, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on Jul 1, 2025 • 0 new comments

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

  #11920 commented on Jul 1, 2025 • 0 new comments

• Assigning window.location after 5.8.2 upgrade fails

  #61335 commented on Jun 30, 2025 • 0 new comments

• (not) Deprecating `--rootDirs`

  #61885 commented on Jun 30, 2025 • 0 new comments

• Check inferred `this` parameter against interface requirement `this: void`

  #44513 commented on Jun 30, 2025 • 0 new comments

• 6.0 Deprecation Candidates

  #54500 commented on Jun 30, 2025 • 0 new comments

• VSCode auto-import ignores typescript.preferences.importModuleSpecifierEnding when using a path from the package.json imports

  #60423 commented on Jun 29, 2025 • 0 new comments

• Enforce property rules on kebab-cased JSX attributes

  #55182 commented on Jun 29, 2025 • 0 new comments

• TypeScript code suggestions include inaccessible private fields from base classes

  #61462 commented on Jun 29, 2025 • 0 new comments

• Allow Inifinity and -Infinity as number literal types

  #32277 commented on Jun 29, 2025 • 0 new comments