Flow To TypeScript Declaration Converter
Convert Flow type annotations into TypeScript declaration files (.d.ts) instantly in your browser.
Generate TypeScript Declaration Files from Flow
Library authors often publish type information as .d.ts declaration files instead of
shipping full TypeScript source. When migrating from Flow, you may need declaration-only output
for consumers who import your package in JavaScript or TypeScript projects.
What this tool does
Paste Flow-annotated code and receive a TypeScript declaration file. The tool first converts Flow syntax to TypeScript, then uses the TypeScript compiler API to emit declaration-only output with function signatures and exported types preserved without implementation bodies.
Workflow tips
For full TypeScript source with implementations, use the Flow to TypeScript Converter. To generate types from JSON payloads instead of Flow, try the JSON to TypeScript POJO Generator.
Frequently Asked Questions
What is a .d.ts file?
A declaration file describes the public types and signatures of a module without including runnable implementation code. TypeScript and many editors use it for autocomplete and type checking when consuming JavaScript libraries.
Why are function bodies missing from the output?
Declaration files intentionally omit implementations. Only type signatures, interfaces, and exported shapes appear so consumers know how to call your API without seeing internal logic.
Does JSX in Flow files work?
Yes. The compiler is configured to handle React JSX syntax during declaration emission, so components annotated with Flow types can produce matching declaration output.
Is conversion performed locally?
Yes. Both the Flow-to-TypeScript transform and declaration emission run in your browser. No source code is uploaded to our servers.
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