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

Outline view does not show props of typescript type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62205 · Opened Aug 5, 2025
Support multiple properties for JSX.ElementAttributesProperty Open

Awaiting More Feedback Domain: JSX/TSX Needs Proposal Suggestion

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

microsoft/TypeScript#62193 · 2 comments · Opened Aug 4, 2025
An error occurs when passing the SourceFile node to getTypeAtLocation. Open

Domain: API Needs More Info

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/TypeScript#62190 · 2 comments · Opened Aug 4, 2025
Form controller bricks intellsense for rest of session Open

Domain: Performance Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/TypeScript#62192 · 2 comments · Opened Aug 3, 2025
Ghost error appearing after signature help in inferred signatures with rest parameter Open

Bug Domain: check: Error Instability Help Wanted Needs Human Review

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

microsoft/TypeScript#62183 · Opened Aug 3, 2025
Ghost error in a circular situation Open

Bug Domain: check: Error Instability Help Wanted

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

microsoft/TypeScript#62181 · Opened Aug 3, 2025
Confusing missing property error in a circular situation Open

Domain: Mapped Types Help Wanted Possible Improvement

microsoft/TypeScript#62180 · 1 comment · 1 assignee · Opened Aug 3, 2025
Confusing in narrowing and property access on type parameter with `never` base constraint Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#62178 · 1 comment · Opened Aug 2, 2025
No error on self-referencing type parameter of non-generic mapped type Open

Bug Domain: Mapped Types Help Wanted

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

microsoft/TypeScript#62176 · 2 reactions · Opened Aug 2, 2025
Bloomberg feedback for 5.9 Open

Discussion

Difficulty 4/5 3-5 days Newbie friendliness 15/100

microsoft/TypeScript#62156 · 1 comment · 7 reactions · Opened Jul 31, 2025
Proposal: repurpose "is" operator for a narrowing version of "satisfies" Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/TypeScript#62146 · 5 comments · 4 reactions · Opened Jul 29, 2025
Imperative type definition Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62145 · 3 comments · Opened Jul 29, 2025
compiler memory leak in 5.8.x and upwards Open

Needs More Info

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

microsoft/TypeScript#62143 · 10 comments · 2 reactions · Opened Jul 28, 2025
Regression in generic inference with JSX in v5.7+ Open

Domain: JSX/TSX Help Wanted Possible Improvement

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

microsoft/TypeScript#62140 · 1 comment · Opened Jul 28, 2025
[error] TSServer exited. Code: null. Signal: SIGTERM on VSCode output - but Typescript still runs in the background Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/TypeScript#62139 · 1 comment · Opened Jul 28, 2025
All types of ECMAScript NativeErrors are always subtype reduced between themselves Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62134 · 6 comments · 1 reaction · Opened Jul 27, 2025
`x && x` should not be `NonNullable` Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#62133 · 5 comments · 5 reactions · Opened Jul 27, 2025
Duplicate imports when using "Update Imports On Paste" Open

Needs Investigation

microsoft/TypeScript#62141 · 1 assignee · Opened Jul 26, 2025
"used before being assigned" fires on LHS inside parens/type assertion Open

microsoft/TypeScript#62127 · 1 comment · 1 reaction · 1 assignee · Opened Jul 25, 2025
Defer baseline comparisons until end of test Open

microsoft/TypeScript#63777 · 1 reaction · 1 assignee · Opened Jul 24, 2025
Suggestion: Derive disposability checks from known symbols rather than global interfaces Open

Experimentation Needed Suggestion

microsoft/TypeScript#62121 · 3 reactions · 1 assignee · Opened Jul 24, 2025
Type Assertion for Function Parameters Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62110 · 2 comments · 1 reaction · Opened Jul 23, 2025
Spread operator allows invalid return type in record data types Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#62095 · 1 comment · Opened Jul 20, 2025
[isolatedDeclarations] function expressions as an argument to a function call that is exported are reported as needing an annotation Open

Domain: flag: isolatedDeclarations Help Wanted Possible Improvement

microsoft/TypeScript#62085 · 1 comment · 2 reactions · 1 assignee · Opened Jul 17, 2025
Google feedback on TS 5.9-beta Open

Discussion

microsoft/TypeScript#62083 · 8 comments · 7 reactions · 1 assignee · Opened Jul 16, 2025
`export { _void as void }` leads to exporting duplicate identifiers Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#62081 · 1 comment · Opened Jul 16, 2025
[tsserver] Multi-project goto definition with accurate results Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62080 · 2 comments · Opened Jul 16, 2025
Unable to infer parameters for generic constructor/functions with a distributive conditional type Open

Bug Domain: Conditional Types Help Wanted

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

microsoft/TypeScript#62079 · 1 comment · Opened Jul 16, 2025
HTMLElement inherits onerror and addListener("error" definitions that are unique to Window Open

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

microsoft/TypeScript#62075 · 1 comment · 1 reaction · 2 assignees · Opened Jul 15, 2025
"await x as any" - Node PartiallyEmittedExpression did not pass test 'isLeftHandSideExpression' assert triggered Open

Bug Domain: API: Transforms Help Wanted

microsoft/TypeScript#62072 · 1 comment · 1 reaction · 1 assignee · Opened Jul 15, 2025
Type inference regression on function calls not saved to variables, due to #61668 Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/TypeScript#62071 · 1 comment · 5 reactions · Opened Jul 15, 2025
[Typescript] Give a visual indicator when overriding methods with the `@sealed` js/tsdoc annotation Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62076 · 5 reactions · Opened Jul 13, 2025
`invalidateResolutionsOfFailedLookupLocations` hogs the CPU for a large project Open

Needs Investigation

microsoft/TypeScript#62054 · 1 assignee · Opened Jul 12, 2025
[TypeScript] Rename Symbol doesn't work as expected with Declaration Merging Open

Needs Investigation

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

microsoft/TypeScript#62065 · 7 comments · Opened Jul 11, 2025
Intl.Collator#compare method type does not match spec Open

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

microsoft/TypeScript#62048 · 5 comments · 1 reaction · 2 assignees · Opened Jul 11, 2025
Shouldn't TypeScript be able to polyfill `import defer` with `Proxy` to work with `"module": "commonjs"`? Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 28/100

microsoft/TypeScript#62031 · 1 comment · Opened Jul 9, 2025
JSDoc `@import` causes `getCompletionEntryDetails` to crash Open

Bug Domain: JSDoc Help Wanted

microsoft/TypeScript#62027 · 1 comment · 1 reaction · 1 assignee · Opened Jul 9, 2025
Deprioritise properties of the form `{ prop?: never }` in completions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62024 · 1 comment · Opened Jul 9, 2025
Support `@import` JSDoc tag for auto-imports Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62008 · 3 comments · 13 reactions · Opened Jul 7, 2025
importing merged declorations in js files Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#61997 · Opened Jul 5, 2025
VSCode not respecting declaration map without absolute sourceRoot Open

7.0 LS Migration

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

microsoft/TypeScript#62009 · 3 comments · Opened Jul 5, 2025
Inconsistent behavior with Generic ElementType Open

Domain: JSX/TSX Help Wanted Possible Improvement

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

microsoft/TypeScript#61995 · 2 comments · Opened Jul 3, 2025
`export let` variable doesn't require the variable to be assigned within current file Open

Domain: check: Control Flow Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

microsoft/TypeScript#61994 · 4 comments · 1 reaction · Opened Jul 3, 2025
Type '`x.y.${Name}`' does not satisfy the constraint '`${string}.${Name}`'.(2344) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61990 · 4 comments · 1 reaction · Opened Jul 2, 2025
Missing constraint error in instantiation expression for a nested class Open

Bug Domain: check: Variance Relationships Help Wanted

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

microsoft/TypeScript#61982 · 2 comments · Opened Jul 1, 2025
The parsing problem of the compiler under specific syntax combinations Open

Bug Domain: Parser Help Wanted

microsoft/TypeScript#61975 · 2 comments · 1 assignee · Opened Jun 30, 2025
Diagnostic code `69010` may be typo of `6910`? Open

Bug Domain: Error Messages Help Wanted

microsoft/TypeScript#61971 · 6 reactions · 1 assignee · Opened Jun 30, 2025
Incorrect type declarations for a constant inside a namespace merged with an enum Open

Bug Domain: Declaration Emit Help Wanted

microsoft/TypeScript#61944 · 1 comment · 2 reactions · 1 assignee · Opened Jun 25, 2025
Ability for checker to resolve modules by node similar to program when providing custom host Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/TypeScript#61941 · 7 comments · Opened Jun 24, 2025
Automatic completion, renaming, go to define based on decorator parameters Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61931 · Opened Jun 24, 2025

microsoft/TypeScript

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