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 Report: Severe memory leak triggered by "TypeScript (Native Preview)" extension Open

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

microsoft/TypeScript#64038 · 3 reactions · Opened Aug 26, 2026
npx tsc -w is triggering itself after each build Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#64037 · 5 comments · Opened Aug 26, 2026
Auto-import prioritizes files alphabetically before index.ts inside a folder, ignoring the barrel Open

Needs More Info

microsoft/TypeScript#64034 · 3 comments · 1 reaction · 3 assignees · Opened Aug 26, 2026
TS5097 is not reported for `require()` in checked JS or for clause-less side-effect imports Open

Bug

microsoft/TypeScript#64028 · 1 reaction · 3 assignees · Opened Aug 26, 2026
vscode.provideDocumentSemanticTokens returns null when using native preview with built-in TS extension disabled Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#64021 · 2 comments · Opened Aug 25, 2026
Design Meeting Notes, 2026-08-25 Open

Design Notes

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

microsoft/TypeScript#64011 · 1 comment · Opened Aug 25, 2026
Generic recursive function infers incorrect return type Open

Bug

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

microsoft/TypeScript#63990 · 1 comment · 2 reactions · Opened Aug 24, 2026
compilerOptions.plugins is not inherited through tsconfig "extends" Open

Docs

Difficulty 3/5 1-2 days Newbie friendliness 65/100

microsoft/TypeScript#63975 · 2 comments · Opened Aug 24, 2026
Auto-delete closing tag when opening tag becomes self-closed Open

Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 58/100

microsoft/TypeScript#64144 · 3 comments · Opened Aug 23, 2026
Inconsistent typing of endless generators between functions and lambdas Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#63970 · 2 comments · Opened Aug 23, 2026
Performance regression for declaration emit of an oversized inferred type Open

Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#63966 · 3 comments · 10 reactions · Opened Aug 23, 2026
Crash: optional chain + tagged template panics the optional-chain transform Open

Bug

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

microsoft/TypeScript#63965 · 1 comment · 1 reaction · Opened Aug 23, 2026
Crash: malformed `super` destructuring in a decorated class static block panics Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

microsoft/TypeScript#63964 · 1 reaction · Opened Aug 23, 2026
Crash: malformed object destructuring assignment panics in class fields transform Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

microsoft/TypeScript#63963 · 1 reaction · Opened Aug 23, 2026
Crash: class-level decorator on an anonymous class panics during ES decorator emit Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

microsoft/TypeScript#63962 · Opened Aug 23, 2026
TS 7.0.2 (tsgo): augmentation of a type-only re-exported interface resolves order-dependently — same file set passes via explicit include list, fails via directory glob Open

Needs More Info

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

microsoft/TypeScript#63960 · 1 comment · Opened Aug 22, 2026
The new `--lsp` flag is not mentioned in `tsc --help`'s output Open

Docs

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

microsoft/TypeScript#63959 · 5 comments · Opened Aug 22, 2026
Declaration emit: JSDoc @typedef/@callback comments are separated from their synthesized type when preceded by another declaration Open

Bug

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

microsoft/TypeScript#63958 · 4 comments · Opened Aug 22, 2026
[7.0 regression] Type parameter default is ignored when the call sits inside a callback passed to a generic function Open

Bug

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

microsoft/TypeScript#63949 · 1 comment · Opened Aug 21, 2026
LSP server sends no per-file diagnostics to clients without pull diagnostics support Open

Needs Investigation

microsoft/TypeScript#63928 · 2 comments · 1 reaction · 1 assignee · Opened Aug 20, 2026
Investigate batching/streaming of AST transfer Open

Domain: API Domain: Performance In Discussion Suggestion

Difficulty 5/5 Over a week Newbie friendliness 38/100

microsoft/TypeScript#63922 · 1 reaction · Opened Aug 20, 2026
[7.1 API] Methods from Type should also exist on the Checker Open

Needs Investigation

microsoft/TypeScript#63917 · 1 reaction · 1 assignee · Opened Aug 20, 2026
[7.1 API] SymbolFlags.All has different value in TS vs GO Open

Needs Investigation

microsoft/TypeScript#63906 · 1 assignee · Opened Aug 20, 2026
Go-to-type definition does not work on aliases to tuple types Open

Bug Domain: LS: Symbol Navigation

Difficulty 3/5 1-2 days Newbie friendliness 64/100

microsoft/TypeScript#63762 · Opened Aug 19, 2026
Panic "Diagnostic emitted without context" ts-go in declaration emit for `export default` arrow/function expression with non-portable inferred return type Open

Bug

microsoft/TypeScript#63761 · 1 comment · 2 reactions · 3 assignees · Opened Aug 19, 2026
API returns a stale SourceFile after the latest snapshot is disposed Open

Needs Investigation

microsoft/TypeScript#63890 · 1 assignee · Opened Aug 19, 2026
Investigate decorator initialization order re: renames of classes Open

Needs Investigation

microsoft/TypeScript#63758 · 1 reaction · 2 assignees · Opened Aug 18, 2026
Diagnostic code 8030 being incorrectly generated using JSDoc `@type` on a function. Open

Bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#63754 · 4 comments · Opened Aug 17, 2026
[ServerErrors][TypeScript] main vs Open

Needs Investigation

microsoft/TypeScript#63889 · 20 comments · 1 assignee · Opened Aug 14, 2026
textDocument/diagnostic on the first-opened file in a session can silently omit real errors Open

Needs Investigation

microsoft/TypeScript#63887 · 2 comments · 1 reaction · 2 assignees · Opened Aug 13, 2026
Memory skyrockets with VSCode extension Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#63886 · 2 comments · Opened Aug 12, 2026
Bad tsserverPath in the unstable/sync API client surfaces as bare "EPIPE: broken pipe, write" instead of naming the executable Open

Possible Improvement

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

microsoft/TypeScript#63885 · Opened Aug 11, 2026
Update wiki "Using the Compiler API" for TypeScript v7 Open

Docs

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#63747 · 2 comments · 2 reactions · Opened Aug 11, 2026
Project references resolve a symlinked sibling's raw source instead of its own composite output, using the wrong project's compilerOptions Open

Needs More Info

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

microsoft/TypeScript#63743 · 2 comments · Opened Aug 10, 2026
Allow settings.json to configure tssdk without a prompt Open

Suggestion

microsoft/TypeScript#63882 · 4 comments · 3 reactions · 3 assignees · Opened Aug 10, 2026
feat(contentmapper): support whole-symbol rename edit projection Open

Suggestion

Difficulty 5/5 Over a week Newbie friendliness 32/100

microsoft/TypeScript#63879 · 1 comment · Opened Aug 10, 2026
[ServerErrors][TypeScript] main vs Open

Needs Investigation

microsoft/TypeScript#63878 · 17 comments · 1 assignee · Opened Aug 8, 2026
--incremental: after a pnpm dependency version change, the cached run is slower than a cold run and most of the time is unattributed Open

Needs Investigation

microsoft/TypeScript#63731 · 2 comments · 1 assignee · Opened Aug 7, 2026
`importHelpers` incorrectly requires `tslib` for native `#private` class members at every dated `target` (ES2022–ES2025), even though no helper is ever emitted Open

Bug Domain: tslib and Helper Functions Help Wanted

Difficulty 3/5 1-2 days Newbie friendliness 72/100

microsoft/TypeScript#63728 · 3 comments · 1 reaction · Opened Aug 6, 2026
Type argument with a subset of the parameter constraint's optional keys incorrectly reported as unassignable to constraint Open

Bug Domain: Mapped Types

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

microsoft/TypeScript#63725 · 3 comments · Opened Aug 6, 2026
Type narrowing not working correctly with Uppercase<string> & Lowercase<string> Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#63724 · 8 comments · 1 reaction · Opened Aug 6, 2026
[API] Narrow types of `Node` attributes when possible Open

Needs Investigation

microsoft/TypeScript#63877 · 1 assignee · Opened Aug 6, 2026
`Array.prototype.at` docs use "code unit" instead of "item" Open

Domain: lib.d.ts Help Wanted

Difficulty 1/5 Under an hour Newbie friendliness 91/100

microsoft/TypeScript#63722 · 4 comments · 1 reaction · Opened Aug 5, 2026
High CPU Usage in Editor (and Controls for LSP) Open

Needs More Info

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

microsoft/TypeScript#63876 · 3 comments · Opened Aug 5, 2026
API feature roadmap Open

Committed Suggestion

microsoft/TypeScript#63875 · 15 comments · 50 reactions · 1 assignee · Opened Aug 4, 2026
internal/ls: getContextNodeForNodeEntry returns nil for module-specifier literals (stock returns the enclosing import statement) Open

Needs Investigation

microsoft/TypeScript#63872 · 1 assignee · Opened Aug 3, 2026
`ReadonlyMap` lacks documentation for `forEach`, `get`, `has` and `size` Open

Domain: lib.d.ts Possible Improvement

Difficulty 1/5 Under an hour Newbie friendliness 90/100

microsoft/TypeScript#63710 · Opened Aug 2, 2026
Property lookups on arguments to type parameters constrained by string index signatures can violate other constraints because undefined is included for optional properties Open

Cursed? Domain: Indexed Access Types Possible Improvement

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

microsoft/TypeScript#63709 · 3 comments · Opened Aug 2, 2026
[API] Expose globals declared by a source file Open

microsoft/TypeScript#63871 · 1 comment · 1 assignee · Opened Aug 1, 2026
[ServerErrors][TypeScript] main vs Open

Bug

microsoft/TypeScript#63870 · 22 comments · 1 assignee · Opened Aug 1, 2026

microsoft/TypeScript

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