microsoft/TypeScript

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TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

Stars: 111k
Forks: 14.3k
Open beginner issues: 18
Indexed issues: 4.9k
Avg merge: 2d 4h
Merged PRs (30d): 132

Dominant language: Go
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

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4,857 open issues indexed

[Bug] PrivateIdentifier nodes are omitted from 2020 semantic classifications Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

microsoft/TypeScript#64322 · 2 comments · Opened Sep 18, 2026
False-positive `unintentional comparison` error with closures Open

Duplicate

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/TypeScript#64314 · 1 comment · Opened Sep 17, 2026
`checkJs` skips `.mjs`/`.cjs` beside a `.d.mts`/`.d.cts`, but not `.js` beside a `.d.ts` Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/TypeScript#64312 · Opened Sep 17, 2026
typescript version 7 complains about unused generic type even though version 6 does not Open

Working as Intended

Difficulty 3/5 1-2 days Newbie friendliness 68/100

microsoft/TypeScript#64308 · 2 comments · Opened Sep 17, 2026
[TS7 LSP] Panic on document URI "file://" (empty path): vfs: path "tsconfig.json" is not absolute Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

microsoft/TypeScript#64300 · 2 comments · Opened Sep 16, 2026
Design Meeting Notes, 2026-09-15 Open

Design Notes

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/TypeScript#64290 · Opened Sep 15, 2026
JSDoc `@type` on a function: the type in a type predicate is never checked (unused `@import` reported, missing names not reported) Open

microsoft/TypeScript#64279 · 5 comments · 1 reaction · 2 assignees · Opened Sep 15, 2026
enhance: Add tests for premature caching of contextual parameter types Open

Possible Improvement

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

microsoft/TypeScript#64278 · 1 comment · 1 reaction · Opened Sep 15, 2026
ts1484 Quick fix will dupe comments Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

microsoft/TypeScript#64272 · 2 comments · Opened Sep 15, 2026
Auto-import completions are not shown inside named imports with TypeScript 7 / tsgo Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

microsoft/TypeScript#64270 · Opened Sep 15, 2026
No batched `getContextualType` in 7.1 API Open

Domain: API In Discussion Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#64265 · Opened Sep 14, 2026
Port `DirWatchSet` over to TS7 Open

Bug Domain: tsc -b

microsoft/TypeScript#64262 · 1 assignee · Opened Sep 14, 2026
Anonymous Symbol Properties Open

Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#64253 · Opened Sep 12, 2026
Object with all context-sensitive properties requires at least one non-context-sensitive property for inference to work Open

Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#64251 · 4 comments · Opened Sep 12, 2026
Spurious TS4094 "exported anonymous class type may not be private" error after upgrading from TS6 to TS7 Open

Needs Investigation

microsoft/TypeScript#64249 · 1 assignee · Opened Sep 12, 2026
Include terminating line in folding ranges when last token has no trailing non-trivia Open

Domain: LS: Outlining Experimentation Needed Suggestion

microsoft/TypeScript#64235 · 1 assignee · Opened Sep 10, 2026
Parser misinterprets async() calls in conditional expressions as async arrow functions Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

microsoft/TypeScript#64231 · 3 comments · Opened Sep 10, 2026
Incorrect TS1111 when using private generator function in JS Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/TypeScript#64228 · 3 comments · Opened Sep 10, 2026
The `options` arg of `Temporal.ZonedDateTime.prototype.toLocaleString()` currently accepts "illegal" option `timeZone` Open

Bug Domain: lib.d.ts Help Wanted Needs Human Review

microsoft/TypeScript#64227 · 1 comment · 1 reaction · 2 assignees · Opened Sep 10, 2026
tsc -b: builders idle on upstream projects because projects are scheduled in depth-first reference order Open

Needs Investigation

microsoft/TypeScript#64222 · 1 assignee · Opened Sep 9, 2026
The `strict` option is confusing since TypeScript 6 Open

Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#64213 · 1 comment · 2 reactions · Opened Sep 9, 2026
Perhaps there is an incorrect test directive in `useStrictLikePrologueString01` Open

Infrastructure

microsoft/TypeScript#64198 · 1 comment · 2 reactions · 2 assignees · Opened Sep 8, 2026
LSP: file contents are not re-read when `didChangeWatchedFiles` reports `Created` (type 1) for a file already in the program Open

Needs Investigation

microsoft/TypeScript#64195 · 1 assignee · Opened Sep 8, 2026
Narrowing of generic this is inconsistent with variable narrowing Open

Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#64186 · Opened Sep 7, 2026
Allow content-mappers to return declarations instead of source files Open

Domain: Content Mappers

microsoft/TypeScript#64182 · 1 comment · 1 reaction · 1 assignee · Opened Sep 6, 2026
[Auto-import] Quick Fix suggests invalid module specifiers that fail to resolve at runtime Open

Bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/TypeScript#64171 · Opened Sep 4, 2026
Should the native TypeScript LSP include top-level imports in its `textDocument/documentSymbol` response? Open

microsoft/TypeScript#64155 · 1 comment · 1 reaction · 2 assignees · Opened Sep 3, 2026
No error when exporting from global augmentations Open

Breaking Change Bug

microsoft/TypeScript#64152 · 1 reaction · 2 assignees · Opened Sep 3, 2026
`sourceMap` emit is disproportionately slow for files containing one very large object literal Open

Bug Needs Human Review

microsoft/TypeScript#64134 · 1 reaction · 2 assignees · Opened Sep 2, 2026
Design Meeting Notes, 2026-09-01 Open

Design Notes

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#64129 · Opened Sep 1, 2026
`forEachChild` is hard to use with async API Open

Domain: API

microsoft/TypeScript#64126 · 1 assignee · Opened Sep 1, 2026
Auto-imports don’t work in content-mappers without existing import Open

Domain: Content Mappers Needs Investigation

microsoft/TypeScript#64119 · 1 assignee · Opened Sep 1, 2026
dom.generated.d.ts is missing from this repo while still referenced in the docs Open

Docs

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

microsoft/TypeScript#64118 · 1 comment · Opened Sep 1, 2026
Design Meeting Notes, 2026-08-27 Open

Design Notes

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#64113 · 6 comments · Opened Aug 31, 2026
Proposal: Expose LSP/Language Service capabilities (e.g., rename) via a tsc subcommand Open

Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#64102 · 3 comments · 1 reaction · Opened Aug 30, 2026
tsconfig `include` silently drops `Foo.tsx` when `foo.ts` exists, on a case-insensitive filesystem Open

Bug

microsoft/TypeScript#64098 · 2 comments · 1 reaction · 2 assignees · Opened Aug 30, 2026
On TypeScript 7, Call hierarchy shows a full absolute path instead of file name + relative path Open

Bug

microsoft/TypeScript#64097 · 1 comment · 10 reactions · 2 assignees · Opened Aug 30, 2026
typescript-language-server does not work with @typescript/typescript6 Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

microsoft/TypeScript#64094 · Opened Aug 29, 2026
Feature request: Dependent contextual inference Open

Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#64091 · 1 comment · 23 reactions · Opened Aug 29, 2026
FSEvents watcher drops events when requested casing differs from disk casing Open

Needs Investigation

microsoft/TypeScript#64089 · 1 assignee · Opened Aug 28, 2026
Switching on a template literal expression does not narrow the interpolated union variable Open

Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#64087 · 2 comments · 5 reactions · Opened Aug 28, 2026
Go-to-definition does not work on `/// <reference lib="..." />` directives Open

Bug Domain: LS: Symbol Navigation

microsoft/TypeScript#64086 · 1 reaction · 2 assignees · Opened Aug 28, 2026
[API] No jsDocParsingMode, and reparsed JSDoc types appear as syntax on the declarations they document Open

API Request

microsoft/TypeScript#64070 · 3 comments · 1 assignee · Opened Aug 28, 2026
[API] No module resolution API: no counterpart to ts.resolveModuleName Open

API Request

microsoft/TypeScript#64069 · 1 assignee · Opened Aug 28, 2026
TS7: `@extends` is ignored when the heritage is a call expression (Base.extend()) Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

microsoft/TypeScript#64058 · Opened Aug 27, 2026
Investigate inconsistencies in editor diagnostic reporting Open

Bug Domain: Editor/VS Code Extension

microsoft/TypeScript#64056 · 1 comment · 1 assignee · Opened Aug 27, 2026
debug extension / mode for content-mapper Open

Needs Investigation

microsoft/TypeScript#64055 · 1 comment · 1 assignee · Opened Aug 27, 2026
content-mapper generates inconsistent declaration extensions, making management of package.json#exports hard / verbose Open

Needs Investigation

microsoft/TypeScript#64053 · 10 comments · 1 assignee · Opened Aug 27, 2026
Content mapper duplicated inlay hints Open

Needs Investigation

microsoft/TypeScript#64050 · 2 comments · 1 assignee · Opened Aug 27, 2026
(Proposal) more-sophisticated CFA, and Narrowing Boolean Types Open

Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#64047 · 2 comments · Opened Aug 26, 2026

microsoft/TypeScript

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