Babel Hermes Parser Plugin

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library 0.35.0 ·javascript
verified May 27, 2026

The `babel-plugin-syntax-hermes-parser` is a Babel plugin designed to switch Babel's default parser, `@babel/parser`, to `hermes-parser`. This provides significant performance benefits due to `hermes-parser` being compiled to WASM from C++, resulting in faster parsing. Additionally, it offers comprehensive syntax support for Flow, making it particularly useful for projects leveraging Flow type annotations. The current stable version, 0.35.0, indicates active development within the Babel and Hermes ecosystems, likely released in tandem with updates to the underlying `hermes-parser` or Babel itself. Its key differentiator lies in its speed and robust Flow support, distinguishing it from other parser options.

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