hermes-parser
npmv0.37.0A JavaScript parser built from the Hermes engine
Safe to adopt
Yes — hermes-parser scores well across adoption, maintenance, weight, supply chain, and licensing. 74.6M downloads per week and 6 known dependents. Last published 57 days ago. 23 releases in the last 2 years.
- AAdoption: grade A, Excellent.
74.6M downloads per week and 6 known dependents.
- AMaintenance: grade A, Excellent.
Last published 57 days ago. 23 releases in the last 2 years.
- AWeight: grade A, Excellent.
Pulls in 1 transitive package, about 2.0 MB installed.
- ASupply chain: grade A, Excellent.
No install scripts, 3 maintainers, and a contained dependency surface.
- ALicense: grade A, Excellent.
MIT — permissive, with no copyleft found in the dependency tree.
Grades are computed deterministically from registry metadata collected by PackageGraph — downloads, dependents, publish dates, the resolved dependency tree, maintainer count, and declared licenses. No third-party scores are used.
Install cost
What you actually take on by adding hermes-parser to a project.
Runtime packages this one declares itself.
Distinct packages in the full runtime tree, deduplicated the way a package manager would.
Unpacked size of this package plus its entire runtime tree.
Longest resolved dependency chain below this package.
Licenses in the dependency tree
Every license you inherit by installing hermes-parser, not just its own. Check this before a legal review, not after.
Compatibility
- Node.js
- No constraint declared
- Module format
- CommonJS only
- TypeScript
- No bundled types
- Install scripts
- None
Dependencies
Declared by hermes-parser v0.37.0. Runtime dependencies are installed with the package; dev dependencies are not.
Runtime (1)
Used by
Popular packages that depend on hermes-parser.
A Metro config for running React Native projects with the Metro bundler
Babel plugin which switches Babel to use the Hermes parser.
Code generation tools for React Native
🚇 Base Babel transformer for Metro.
🚇 The JavaScript bundler for React Native.
Babel transformer for React Native applications.
Relationship graph
Dependencies (left) and dependents (right) of hermes-parser.
Frequently installed together
The Expo SDK
flow typed nullthrows
Utility functions for converting to and from URLs that encode query string data into URL paths
Lightweight debugging utility for Node.js and the browser
Turns an AST into code.
Generate errors that contain a code frame that point to source locations.
Tool for transforming styles with JS plugins
Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-env-preset
Generate source maps
A library for interacting with the app.json
Encode/decode sourcemap mappings
Blazing fast and accurate glob matcher written in JavaScript, with no dependencies and full support for standard and extended Bash glob features, including braces, extglobs, POSIX brackets, and regular expressions.
Release history
20 releases in the last two years, typically about 18 days apart.
| Version | Published | Size | License |
|---|---|---|---|
| 0.37.0latest | 1 month ago | 1.5 MB | MIT |
| 0.36.1 | 4 months ago | 1.5 MB | MIT |
| 0.36.0 | 4 months ago | 1.5 MB | MIT |
| 0.35.0 | 5 months ago | 1.5 MB | MIT |
| 0.34.0 | 6 months ago | 1.5 MB | MIT |
| 0.33.3 | 8 months ago | 1.5 MB | MIT |
| 0.33.2 | 8 months ago | 1.5 MB | MIT |
| 0.33.1 | 8 months ago | 1.5 MB | MIT |
| 0.33.0 | 9 months ago | 1.5 MB | MIT |
| 0.32.1 | 11 months ago | 1.5 MB | MIT |
| 0.32.0 | 1 year ago | 1.4 MB | MIT |
| 0.31.2 | 1 year ago | 1.4 MB | MIT |
| 0.31.0 | 1 year ago | 1.4 MB | MIT |
| 0.30.0 | 1 year ago | 1.4 MB | MIT |
| 0.29.1 | 1 year ago | 1.4 MB | MIT |
Overview
hermes-parser is an npm package that a JavaScript parser built from the Hermes engine. It is extremely widely used, with about 74.6M downloads per week and 6 known dependents in the graph. The latest version is 0.37.0, released under the MIT license.
Who should use it
Teams working in the npm ecosystem who need a JavaScript parser built from the Hermes engine and value a battle-tested, widely-adopted solution.
When not to use it
Consider an alternative if you need to have first-class TypeScript types out of the box, or if a more actively-maintained option better fits your npm stack.
Pros
- Large, well-established user base (74.6M weekly downloads).
- Clear open-source license (MIT).
Cons
- No bundled TypeScript types (may require a separate @types package).
Auto-generated from collected registry metadata. No external claims are inferred.
Maintainers
Frequently asked questions
Should I use hermes-parser?
Yes — hermes-parser scores well across adoption, maintenance, weight, supply chain, and licensing. 74.6M downloads per week and 6 known dependents. Last published 57 days ago. 23 releases in the last 2 years.
How do I install hermes-parser?
Run `npm install hermes-parser` to add hermes-parser to your npm project.
How many dependencies does hermes-parser have?
hermes-parser declares 5 direct dependencies and pulls in 1 packages in total once its runtime tree is resolved totalling about 2.0 MB on disk.
What license is hermes-parser released under?
hermes-parser is distributed under the MIT license.
How popular is hermes-parser?
hermes-parser has approximately 74,564,535 downloads per week and 6 known dependent packages.
Is hermes-parser still maintained?
The most recent release of hermes-parser (v0.37.0) was published 1 month ago.
Does hermes-parser run install scripts?
No. hermes-parser does not define preinstall, install, or postinstall scripts, so installing it does not execute publisher-supplied code.