Flow-bin: Flow Type Checker Binary Wrapper

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library 0.310.0 ·javascript maintenance
verified May 27, 2026

Flow-bin is a wrapper package that provides the Flow static type checker binary for JavaScript projects. Developed primarily by Facebook/Meta, Flow offers static analysis capabilities similar to TypeScript, inferring types and catching errors before runtime. The package, currently at version `0.310.0`, bundles the corresponding Flow `0.310.0` binary, making it accessible via `npm` or `yarn` scripts and programmatically through Node.js's `child_process` module. While Flow itself is still actively developed and utilized internally at Meta, its public GitHub repository has been archived, meaning external contributions are no longer accepted, and community support is more limited. This positions `flow-bin` primarily as a maintenance package for delivering Meta's internal Flow updates to the public, rather than an actively evolving open-source project. Its release cadence is tied directly to Flow's internal release schedule. It serves as an alternative to TypeScript for adding static typing to JavaScript projects.

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