TypeScript to JavaScript Converter

Convert TypeScript to JavaScript instantly. Perfect for transpilation, removing type annotations, or understanding compiled output for browser deployment.

typescript to javascript transpilation type stripping
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INPUT
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GENERATED OUTPUT
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Transpile TypeScript to JavaScript

Converting TypeScript to JavaScript strips type annotations while preserving runtime behavior. Our AI converter removes all type information (interfaces, types, generics), compiles decorators to their JavaScript equivalents, and handles TypeScript-specific features like enums and namespaces. Perfect for understanding TypeScript compilation output, deploying to environments without TypeScript support, or learning how TypeScript features translate to JavaScript. The converter produces clean, readable JavaScript that browsers and Node.js can execute directly.

Conversion Features

Type Annotation Removal

Strips all type annotations completely. Variable types (let x: number), function return types (: string), generic parameters (<T>), and union/intersection types are removed, leaving only JavaScript code.

Interface and Type Elimination

Removes interfaces, type aliases, and declaration files entirely. These TypeScript-only constructs have no runtime presence, so they're completely stripped from output while their usage remains as untyped JavaScript.

Enum Compilation

Converts TypeScript enums to JavaScript objects or const objects. Numeric enums become bidirectional maps, string enums become simple objects, and const enums are inlined at compile time.

Modern Syntax Downleveling

Can optionally downlevel ES6+ features to ES5 for older browsers. Async/await converts to generators, arrow functions to regular functions, and classes to prototype-based constructors if targeting older environments.

FAQs

How are TypeScript types removed?

Type annotations are stripped completely. Interface definitions are removed, type aliases deleted, and generic type parameters erased. The resulting JavaScript has identical runtime behavior but no type information.

What happens to TypeScript interfaces?

Interfaces are completely removed as they're compile-time only constructs. If interfaces were used for runtime checking, those patterns convert to JavaScript validation code or are removed if purely for static typing.

Can it handle TypeScript decorators?

Decorators convert to their compiled JavaScript equivalents - wrapper functions or property descriptors. Experimental decorators follow TypeScript's compilation output, and standard decorators use the spec-compliant format.

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Transpile your TypeScript code to browser-ready JavaScript.

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