3 free tools
Flow Developer Tools
Convert Flow annotations and files into JavaScript, TypeScript, and TypeScript declaration outputs for legacy code migration.
What this Flow collection covers
- Useful for maintaining or migrating older Flow codebases.
- Helps estimate migration effort before changing a repository.
- Creates reviewable output for TypeScript modernization.
Common workflows
- Convert Flow source to JavaScript while removing annotations.
- Translate Flow types into TypeScript syntax.
- Generate migration drafts for code review.
Flow to TypeScript
Convert Flow to TypeScript. Free, no signup, runs in browser. By Folioify.
Flow to TypeScript Declaration
Generate TypeScript .d.ts from Flow. Free, in-browser, no signup. By Folioify.
Flow to plain JavaScript
Strip Flow annotations to plain JavaScript. Free, no signup, runs in browser. By Folioify.
Why use these Flow tools?
These tools focus on quick transformations and validation tasks that developers repeat during implementation, debugging, documentation, and migration work.
Are uploads required?
No. Tools run in the browser whenever possible, so code snippets stay on your device and can be copied out immediately.
Flow tools FAQ
Can these tools migrate a whole Flow repo?
No. They convert snippets and files. Repository migration still needs build, lint, and test work.
Are Flow and TypeScript semantics identical?
No. Exact object types, variance, and utility types often need manual review.