TypeScript To Flow
Transform TypeScript type definitions into Flow annotations with real-time browser-side conversion using flowgen.
Convert TypeScript Types to Flow
Teams migrating between TypeScript and Flow need compatible type syntax. Rewriting interfaces, unions, and utility types by hand is slow and error-prone. This TypeScript to Flow converter generates Flow definitions from TypeScript source automatically.
What this tool does
Paste TypeScript type definitions, interfaces, and typed functions. The tool outputs equivalent Flow annotations using the flowgen compiler, then formats the result for readability. Updates happen in real time as you edit the input.
Migration and interoperability
Use this when sharing types with a Flow codebase, auditing differences before a migration, or generating Flow stubs from existing TypeScript models. For the reverse direction, try our Flow to TypeScript Converter. To strip types entirely, use the TypeScript to JavaScript tool.
Frequently Asked Questions
What TypeScript features are supported?
Common patterns such as interfaces, type aliases, unions, optional properties, arrays, and functions with typed parameters are supported. Some advanced TypeScript-only features may not have a direct Flow equivalent and can produce warnings or approximations.
Can I convert entire application files?
The tool works best on type definition snippets: interfaces, type exports, and typed function signatures. Large files with heavy runtime logic may include constructs that flowgen cannot map cleanly to Flow.
Does this produce runnable JavaScript?
No. Output is Flow type syntax meant for static analysis. Remove or adapt value-level TypeScript syntax separately if you need executable code.
Is my code processed on a server?
No. The flowgen compiler runs locally in your browser. Your TypeScript source stays on your device.
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