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TypeScript To TypeScript Declaration

Convert TypeScript source into .d.ts declaration files with emitDeclarationOnly compiler output in the browser.

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Generate TypeScript Declaration Files

Declaration files (.d.ts) expose type information without shipping implementation code. Library authors, package maintainers, and teams sharing typed APIs need .d.ts output from TypeScript sources. This tool runs the TypeScript compiler with emitDeclarationOnly and produces declaration files instantly in your browser.

What this tool produces

Paste TypeScript or TSX source and receive a .d.ts file containing exported types, interfaces, and function signatures. Implementation bodies are stripped while type information is preserved for consumers of your module.

Related developer tools

To convert Flow instead of TypeScript, use the Flow to TypeScript Declaration Converter. To strip types entirely and get JavaScript, try TypeScript to JavaScript. For JSON Schema output, use TypeScript to JSON Schema.

Frequently Asked Questions

What is emitDeclarationOnly?

It is a TypeScript compiler option that outputs only .d.ts declaration files without generating JavaScript. This tool uses that mode so you get type definitions suitable for library distribution.

Does this support TSX and React components?

Yes. The compiler accepts TSX syntax and emits declaration signatures for React components, props interfaces, and exported functions.

Why do I see compiler errors?

Invalid TypeScript syntax, unresolved type references, or missing imports in your pasted source can cause the compiler to report diagnostics. Fix those issues in the input for clean output.

Is my code uploaded anywhere?

No. The TypeScript compiler runs locally in your browser. Your source is not transmitted to any server.

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