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TypeScript Type Stripper

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INPUT

Auto Process

OUTPUT

Client Side

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Guide

TypeScript Type Stripper

The TypeScript Type Stripper turns TypeScript source into clean, runnable JavaScript by erasing every compile-time construct the language adds on top of ECMAScript. Type annotations, interface declarations, type aliases, generic parameters, enums, decorators, and non-null assertions are removed in a single deterministic pass while the runtime logic of your program is preserved exactly as written.

The tool runs entirely in your browser using the official TypeScript compiler API, so your source code never leaves your machine. Output is identical to what tsc would produce for the same input, which makes the stripper safe for porting libraries, sharing snippets in plain-JavaScript contexts, debugging post-transpile behaviour, and migrating off TypeScript when a project no longer needs it.

How to Use

Paste your TypeScript source code into the input area, or drop a .ts or .tsx file onto the uploader.
Choose an output mode: Strip types only keeps modern syntax intact, while the ES2020, ES2017, and ES5 targets additionally downlevel newer language features.
Pick a JSX handling option if your code contains JSX expressions, then toggle JSDoc preservation, type-only import removal, and comment stripping to taste.
Plain JavaScript appears in the output panel as soon as the compiler finishes. Use the copy or download button to grab the result.

Features

Deterministic AST transformation – Built on the official TypeScript compiler so output is byte-for-byte reproducible.
Strip-only or downlevel – Choose between pure type removal or full transpilation to ES2020, ES2017, or ES5.
Complete language coverage – Handles interfaces, type aliases, generics, enums, decorators, parameter properties, and non-null assertions cleanly.
JSX-aware – Preserve .jsx output or convert to React.createElement calls.
Comment control – Keep JSDoc blocks, strip them, or remove every comment for production builds.
Type-only import cleanup – Removes import type statements that no longer reference anything at runtime.
Privacy first – Everything runs in your browser; no code is uploaded to any server.
Size reporting – See how many bytes the stripped output saves over the original source.

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 FAQ

What is TypeScript and how does it differ from JavaScript?

TypeScript is a strict superset of JavaScript that adds static type annotations, interfaces, enums, generics, and other compile-time constructs. The TypeScript compiler (tsc) parses these constructs into an Abstract Syntax Tree (AST) and then emits standards-compliant JavaScript by erasing the type layer. Because types exist only at compile time, the runtime behaviour of well-typed TypeScript is identical to the JavaScript it transpiles to.
Why is type erasure a deterministic transformation?

Type erasure is deterministic because it operates on a parsed AST rather than on raw text. Each node in the tree carries an explicit kind, and the compiler removes nodes of type-only kinds (such as TypeAnnotation, InterfaceDeclaration, and TypeAliasDeclaration) without touching adjacent value-producing expressions. The resulting JavaScript is therefore guaranteed to preserve semantics whenever the source is syntactically valid.
What are ECMAScript downlevel targets and why do they matter?

ECMAScript editions (ES2017, ES2020, ES2022, etc.) define which language features browsers and runtimes implement natively. A downlevel target instructs a compiler to rewrite newer features (optional chaining, async/await, class fields) into equivalent code that older targets can execute. Choosing a lower target widens compatibility at the cost of output size and emitted helper functions.
How do declaration files and runtime code differ?

A declaration file (.d.ts) contains only ambient type information: interfaces, type aliases, function signatures, and module shapes. It produces no runtime code when compiled. Implementation files (.ts) blend type declarations with runtime expressions. During transpilation, all .d.ts content disappears and only the executable subset of .ts files is emitted to JavaScript.