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hermes - 💡(How to fix) Fix npm install warns about deprecated @babel/plugin-proposal-private-methods

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hermes update currently emits an npm deprecation warning for @babel/[email protected].

Error Message

npm warn deprecated @babel/[email protected]: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-private-methods instead.

Root Cause

hermes update currently emits an npm deprecation warning for @babel/[email protected].

Code Example

npm warn deprecated @babel/plugin-proposal-private-methods@7.18.6: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-private-methods instead.

added 405 packages in 6s
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Summary

hermes update currently emits an npm deprecation warning for @babel/[email protected].

Environment

  • OS: Arch Linux
  • Hermes: Hermes Agent v0.14.0 (2026.5.16)
  • Command invoked by wrapper: hermes update
  • Run timestamp: 2026-05-24 23:50 America/Sao_Paulo

Observed output excerpt

npm warn deprecated @babel/[email protected]: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-private-methods instead.

added 405 packages in 6s

Expected behavior

The dependency chain used by the Node.js portion of Hermes should avoid deprecated Babel proposal plugins when possible, for example by moving to @babel/plugin-transform-private-methods or by updating the package that pulls in the deprecated plugin.

Impact

The update completed successfully, but the warning adds noise to automated update logs and indicates a dependency that Babel no longer maintains.

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FAQ

Expected behavior

The dependency chain used by the Node.js portion of Hermes should avoid deprecated Babel proposal plugins when possible, for example by moving to @babel/plugin-transform-private-methods or by updating the package that pulls in the deprecated plugin.

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