TypeScript Type Stripper
Strip type annotations, interfaces and generics from TypeScript source to get runnable JavaScript — a conservative, lexer-based pass that leaves anything ambiguous untouched.
>_ USAGE GUIDE
Strip type annotations, interfaces and generics from TypeScript source to get runnable JavaScript. It is a conservative, lexer-based pass that leaves anything ambiguous untouched — better to leave a trace of type syntax than to alter your logic.
Be clear that this is type stripping, not a full compile: it does no type checking (no type errors reported), no syntax down-leveling (optional chaining, decorators and the like are not transpiled) and leaves complex constructs such as decorators as they are. It fits quick trials — running a snippet, or turning pasted TS into JS you can execute directly. It is not a replacement for a real build: when you need type safety or target-environment compatibility, use tsc or babel.
- Paste the TS source: drop in the whole TypeScript block
- Run the strip: execute the transform
- Inspect the output: confirm the logic is unchanged and note any leftover syntax
- Copy the runnable JS: run it or paste it into the browser console
>_ FAQ
Q1 · Does this tool perform type checking?
No. It only strips types — removing annotations, interfaces and generics — without validating correctness, so it reports no type errors. For type checking use tsc; this tool is about getting typed code to run quickly.
Q2 · Why is some type syntax not removed?
Because it is conservative: when it meets a complex construct it cannot safely resolve (certain decorators, or code where types and runtime logic are mixed), it leaves it untouched rather than risk breaking the logic. So a little type syntax may remain in the output — intentional, since leaving a trace beats mis-transforming.
Q3 · How does it differ from tsc or babel?
tsc is the full TypeScript compiler: it type-checks and can down-level new syntax to a target. babel transforms and down-levels through plugins. This tool is neither: it is a lightweight lexical type-strip that checks nothing and down-levels nothing, valued for "paste and run" immediacy rather than production builds.
Q4 · Does it handle decorators and enums?
For syntax that produces runtime code, such as enum, and complex constructs such as decorators, the tool tends to leave them as-is to avoid a wrong transform. If your code leans heavily on decorator or enum runtime semantics, use tsc or babel so the output behavior is correct.
Q5 · How does it differ from the JSON-to-TypeScript tool?
Opposite directions: the JSON-to-TypeScript tool (json2type) generates types, deriving an interface from a piece of JSON data, while this tool removes types, deleting type syntax from existing TS. One creates types and one strips them, so together they move you between "having a data shape" and "needing to run".