# microsoft/TypeScript

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

Repository: https://github.com/microsoft/TypeScript
Canonical: https://ross.abutalabs.com/products/typescript
Homepage: https://www.typescriptlang.org
Language: Go
License: Apache-2.0
License Family: permissive
Topics: typescript, javascript, language, typechecker
Last push: 2026-08-26T23:49:27+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 4460, "days_push": 7, "days_rel": 13, "gap_med": 45.5, "n_releases_24m": 11}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 110715, forks 13762 (observed 2026-08-28T04:12:23.861385+00:00)

## What it is
TypeScript is a strongly typed superset of JavaScript that adds optional static types and compiles down to clean, standards-based JavaScript. It ships as an npm-installable compiler (tsc) and language service that powers editor tooling, type checking, and large-scale JavaScript application development.

## Use cases
- add static types to a javascript codebase
- catch type errors before running my code
- compile typescript to javascript
- get better autocomplete and editor tooling for js
- migrate a large javascript project gradually to typed code
- write typed node.js backend code
- check plain javascript files with jsdoc types

## When to choose
- you are building any non-trivial JavaScript or Node.js application and want static type safety
- you want incremental adoption of types in an existing JavaScript codebase
- you need rich editor tooling, refactoring, and early error detection at scale

## When to avoid
- you need a tiny one-off script where type annotations add overhead
- your build pipeline cannot tolerate a compile/transpile step
- you rely on libraries without type definitions and do not want to write .d.ts files

## Facets
- artifact type: library
- maturity: stable
- function: compiler, type-system, developer-tools, linter
- domain: programming-languages, compilers, web-development, developer-tools, frontend, backend
- platform: cross-platform, browser, cli, bun
- tags: typescript, javascript, static-type-checking, transpiler, tsc, superset-of-javascript, nodejs, deno

## Member repositories
- microsoft/TypeScript (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:23.861385+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:12:05.567565+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/TypeScript (fetched 2026-08-28T04:12:23.861385+00:00, sha c0cde3d07cbd)
  - homepage: https://www.typescriptlang.org (fetched 2026-08-28T17:31:45.637078+00:00, sha 0b7a00efc47a)
  - site_page: https://www.typescriptlang.org/docs/ (fetched 2026-08-28T17:31:45.645774+00:00, sha 4a07b59ae144)
  - site_page: https://www.typescriptlang.org/docs/handbook/intro.html (fetched 2026-08-28T17:31:45.647439+00:00, sha 25b86157d878)
  - site_page: https://www.typescriptlang.org/download/ (fetched 2026-08-28T17:31:45.649152+00:00, sha 405d7160e310)
- Data as of 2026-08-30T08:39:29.467469+00:00.