ts-blank-space – fast TypeScript type-stripper

In plain words

ts-blank-space is a TypeScript type-stripping compiler that removes type annotations from TypeScript code without generating new code. Written in TypeScript and using the official TypeScript parser, it runs 5.6x faster than tsc while preserving accurate source locations. The tool is already used in production and inspired the approach behind Node.js's `--experimental-strip-types` feature.

written from the facts on this page · September 2026

From the sources

A small, fast, pure JavaScript type-stripper that uses the official TypeScript parser.

ts-blank-space is a fast type-stripping compiler that converts TypeScript to JavaScript. It supports a modern subset of TypeScript by erasing the types and replacing them with whitespace. That's it. It is not a type checker and does not perform any other code transformations. The underlying technique can improve build performance and simplify development. The implementation is pure TypeScript. It is simple enough to read and understand in a few minutes because it is only 700 lines of code and reuses the original TypeScript parser. The core idea is to use spaces as a substitute for type annotations. You can think of ts-blank-space as a reference implementation of this type-stripping…from bloomberg.github.io

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