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

Beginner friendly Everything

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4,857 open issues indexed

Publish an "other" platform VSIX Open

Infrastructure

microsoft/TypeScript#63842 · 1 assignee · Opened Jun 18, 2026
`export` modifier on `enum` disables `This condition will always return * ts2845` Open

Bug Domain: check: Control Flow

Difficulty 3/5 1-2 days Newbie friendliness 56/100

microsoft/TypeScript#63565 · 4 comments · Opened Jun 18, 2026
Behavior difference: Comment above `@typedef` does not become comment for the corresponding emitted type in tsgo Open

microsoft/TypeScript#63841 · 2 reactions · 2 assignees · Opened Jun 18, 2026
Behavior difference: Block comments on `@typedef` structural types are not preserved, if they are imported and reconstructed as inline types in another file Open

Possible Improvement

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

microsoft/TypeScript#63839 · 5 comments · Opened Jun 17, 2026
RemoteNodeList inherited array methods throw this.view.getUint32 is not a function Open

Needs Investigation

microsoft/TypeScript#63838 · 1 comment · 1 reaction · 2 assignees · Opened Jun 16, 2026
Behavior difference: Type emit inconsistency with dangling block comment in file Open

Possible Improvement

microsoft/TypeScript#63837 · 1 reaction · 2 assignees · Opened Jun 16, 2026
Incorrect type resolution with nested constructors Open

Bug Domain: classes

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

microsoft/TypeScript#63559 · 2 reactions · Opened Jun 16, 2026
Overload missing from createElementNS Open

Domain: lib.d.ts Possible Improvement

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

microsoft/TypeScript#63556 · 1 comment · Opened Jun 15, 2026
Quadratic check time for diamond-shaped interface inheritance graphs Open

Domain: Performance Possible Improvement

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

microsoft/TypeScript#63555 · 5 comments · 1 reaction · Opened Jun 15, 2026
Behavior difference: (jsdoc) comment emit inconsistencies on expando functions Open

Possible Improvement

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

microsoft/TypeScript#63836 · Opened Jun 12, 2026
Destructured function does not show outline of inner function parameters Open

Awaiting More Feedback Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/TypeScript#63551 · 2 comments · Opened Jun 12, 2026
Can't enable TypeScript native preview in VS Code Open

Needs Investigation

microsoft/TypeScript#63835 · 5 comments · 1 reaction · 1 assignee · Opened Jun 12, 2026
Duplicate function declarations in generated `.d.ts` for non-module JS files with `allowJs` + `declaration` Open

Bug Domain: Declaration Emit

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

microsoft/TypeScript#63546 · 3 comments · Opened Jun 10, 2026
Fatal error during resolution through `RootLength` Open

Crash

microsoft/TypeScript#63834 · 1 comment · 1 reaction · 2 assignees · Opened Jun 8, 2026
Fatal server error: nil Session from `flushChangesLocked()` Open

Crash Needs More Info

microsoft/TypeScript#63833 · 1 reaction · 2 assignees · Opened Jun 8, 2026
[Post-7.0] Improve readability of `Array.from` / `TypedArray.from` `mapFn` parameters Open

Possible Improvement

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

microsoft/TypeScript#63832 · 1 comment · Opened Jun 7, 2026
Better ownership lint to eliminate ownership chaos for generated code Open

Needs Proposal Suggestion

Difficulty 5/5 Over a week Newbie friendliness 18/100

microsoft/TypeScript#63540 · 6 comments · 2 reactions · Opened Jun 6, 2026
Declarations that shadow global `Symbol` break emit for `using` declarations Open

Bug Domain: JS Emit

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/TypeScript#63522 · 4 comments · Opened Jun 1, 2026
Declaration emit differs for negative numeric const literals Open

Possible Improvement

microsoft/TypeScript#63831 · 1 comment · 1 reaction · 2 assignees · Opened May 31, 2026
Declaration emit spends significant CPU in getAliasForSymbolInContainer / getAlternativeContainingModules Open

Needs More Info

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

microsoft/TypeScript#63830 · 13 comments · Opened May 30, 2026
Font bug Open

Needs More Info

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/TypeScript#63507 · 4 comments · Opened May 26, 2026
Behavior difference: Inline comment on arrow function parameters is emitted on tsc but not on tsgo Open

Domain: Comment Emit Domain: Declaration Emit

microsoft/TypeScript#63826 · 1 reaction · 2 assignees · Opened May 24, 2026
Wildcard package.json exports auto-import path does not apply traversal containment checks Open

Bug Domain: LS: Auto-import

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

microsoft/TypeScript#63499 · 3 comments · 1 reaction · Opened May 22, 2026
`js/ts.preferences.autoImportFileExcludePatterns` is not reflected promptly in IntelliSense suggestions Open

Needs Investigation

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

microsoft/TypeScript#63498 · 1 comment · 2 reactions · Opened May 21, 2026
`DeepCloneNode` allocation runaway (44 GB / 308 s) for recursive tagged-tuple type alias Open

Domain: Declaration Emit Needs Investigation Needs More Info

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

microsoft/TypeScript#63825 · 1 comment · Opened May 20, 2026
DOM: `Element#matches()` incorrectly narrows types Open

Domain: lib.d.ts Help Wanted

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

microsoft/TypeScript#63497 · 14 comments · 3 reactions · Opened May 20, 2026
`default` keyword is offered in expression-bodied arrow function completions Open

Bug Domain: LS: Completion Lists

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

microsoft/TypeScript#63463 · 18 comments · Opened May 9, 2026
Add `rootDir` to self-name tests after moving tests out of submodule and into Go codebase Open

microsoft/TypeScript#63822 · 1 assignee · Opened May 8, 2026
Experiment with alternative values of `GOGC` Open

Possible Improvement

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

microsoft/TypeScript#63821 · 1 reaction · Opened May 7, 2026
Preserve more context in cross-project stack traces Open

Possible Improvement

microsoft/TypeScript#63820 · 1 reaction · 2 assignees · Opened May 6, 2026
project reference resolution fails when workspace is opened through a symlinked root path Open

Needs Investigation

microsoft/TypeScript#63819 · 1 comment · 1 assignee · Opened May 3, 2026
String.split() method's separator argument should allow undefined Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#63456 · 5 comments · Opened May 1, 2026
`new super()` in static method does not cause error Open

Bug Domain: classes

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/TypeScript#63451 · 4 comments · Opened Apr 30, 2026
Harden rescan strategy for astnav Open

microsoft/TypeScript#63818 · 1 assignee · Opened Apr 29, 2026
`libReplacement: true` lookup folder should be configurable (via `typeRoots` ?) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#63448 · 5 comments · 1 reaction · Opened Apr 29, 2026
New untitled files are not correctly managed by config file status bar indicator Open

microsoft/TypeScript#63817 · 1 assignee · Opened Apr 27, 2026
Formatting fails for entire file when a line contains only whitespace between two comments Open

microsoft/TypeScript#63816 · 2 reactions · 2 assignees · Opened Apr 27, 2026
`symbolToNode` stack overflow when using recursive types and functions with type parameters Open

Bug Domain: check: Type Circularity

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

microsoft/TypeScript#63441 · 4 comments · 3 reactions · Opened Apr 26, 2026
Paths from tsconfig are not used if declaration is on a different partition Open

Needs Investigation

microsoft/TypeScript#63430 · 1 comment · 1 assignee · Opened Apr 24, 2026
Add type definition for Math.sumPrecise (ES2025 / TC39 proposal) Open

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

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

microsoft/TypeScript#63427 · 8 comments · 3 reactions · Opened Apr 23, 2026
Hover display for non-homomorphic mapped types renders numeric-string keys indistinguishably from numeric keys Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#63425 · 6 comments · Opened Apr 23, 2026
Excess-property check fires on a nested object literal that is later assigned to an annotated return type, where tsc 6.0 does not Open

microsoft/TypeScript#63815 · 2 comments · 1 assignee · Opened Apr 22, 2026
Corsa differences in `export=` module augmentation Open

Help Wanted

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

microsoft/TypeScript#63814 · 8 comments · Opened Apr 21, 2026
Wasm build Open

Committed Suggestion

microsoft/TypeScript#63813 · 5 comments · 1 reaction · 1 assignee · Opened Apr 21, 2026
Rename symbol renamed element declaration in node_modules Open

Needs More Info

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

microsoft/TypeScript#63450 · 2 comments · Opened Apr 21, 2026
union of pattern template literals intersected with optional brand mutually assignable to one with incompatible brand Open

Bug Domain: Intersection

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

microsoft/TypeScript#63420 · 2 comments · Opened Apr 21, 2026
skipLibChecks specificity Open

Needs Proposal Suggestion

Difficulty 5/5 Over a week Newbie friendliness 45/100

microsoft/TypeScript#63397 · 4 comments · Opened Apr 13, 2026
Review/update https://typescriptlang.org/tsconfig for TS 6.0 Open

Docs

microsoft/TypeScript#63392 · 6 comments · 1 assignee · Opened Apr 12, 2026
The module namespace object returned by __importStar is not the same when import the same module multiple times Open

Bug Domain: JS Emit

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

microsoft/TypeScript#63391 · 2 comments · 1 reaction · Opened Apr 12, 2026
ESM strict imports mode option to moduleResolution bundler Open

Needs More Info

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

microsoft/TypeScript#63381 · 2 comments · Opened Apr 9, 2026

microsoft/TypeScript

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