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hermes - 💡(How to fix) Fix npm: deprecated @babel/[email protected] (no longer maintained, used via eslint-plugin-react-compiler)

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npm install in ui-tui/ emits a deprecation warning for @babel/[email protected]:

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deprecated @babel/[email protected]: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained.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.

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deprecated @babel/[email protected]: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained.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

npm install in ui-tui/ emits a deprecation warning for @babel/[email protected]:

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deprecated @babel/[email protected]: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained.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.

Fix Action

Fix / Workaround

  • Build-time / lint-time only (not in production runtime)
  • This proposal has been merged into the ECMAScript standard; the replacement is @babel/plugin-transform-private-methods
  • The deprecated plugin is still functional but receives no further updates

There is no safe overrides workaround for internal plugin dependencies — eslint-plugin-react-compiler must make the change upstream.

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This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained.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.

---

ui-tui (devDependencies)
  └─ eslint-plugin-react-compiler@^19.1.0-rc.2
       └─ @babel/plugin-proposal-private-methods@^7.18.6  (resolved: 7.18.6)   ← deprecated, unmaintained
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Summary

npm install in ui-tui/ emits a deprecation warning for @babel/[email protected]:

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deprecated @babel/[email protected]: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained.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.

Dependency Chain

ui-tui (devDependencies)
  └─ eslint-plugin-react-compiler@^19.1.0-rc.2
       └─ @babel/plugin-proposal-private-methods@^7.18.6  (resolved: 7.18.6)   ← deprecated, unmaintained

Impact

  • Build-time / lint-time only (not in production runtime)
  • This proposal has been merged into the ECMAScript standard; the replacement is @babel/plugin-transform-private-methods
  • The deprecated plugin is still functional but receives no further updates

Suggested Fix

This depends on an upstream update of eslint-plugin-react-compiler. The fix path is:

  1. eslint-plugin-react-compiler needs to update its dependency from @babel/plugin-proposal-private-methods to @babel/plugin-transform-private-methods.
  2. Once released, bump eslint-plugin-react-compiler in ui-tui/package.json to the fixed version.

There is no safe overrides workaround for internal plugin dependencies — eslint-plugin-react-compiler must make the change upstream.

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hermes - 💡(How to fix) Fix npm: deprecated @babel/plugin-proposal-private-methods@7.18.6 (no longer maintained, used via eslint-plugin-react-compiler)