microsoft/tslib

Health v2 · maintenance only

Adoption not part of the score

1343 stars · 146 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

tslib is a runtime library containing all of TypeScript's emitted helper functions like __extends and __assign. It is used with the --importHelpers compiler flag to deduplicate helpers across modules, producing smaller bundles with less runtime overhead.

Use cases

• reduce bundle size in TypeScript projects
• avoid duplicate helper function declarations in compiled output
• optimize emitted JavaScript from the TypeScript compiler
• share TypeScript runtime helpers across modules
• speed up TypeScript application runtime

When to choose

• you compile TypeScript with importHelpers enabled and want smaller output
• you maintain a library that emits helper calls and want a shared runtime dependency
• you are optimizing bundle size for a large TypeScript codebase

When to avoid

• your project is plain JavaScript with no TypeScript compilation
• you cannot add runtime dependencies to a zero-dependency library
• your toolchain already inlines or deduplicates TypeScript helpers

Facets

library · maturity stable

developer-tools build-tool developer-tools web-development programming-languages browser cross-platform typescript compiler-helpers runtime-library bundle-optimization javascript nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="microsoft/tslib")