Apply preset defaults without a Babel API - #58254
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Summary:
The preset's Babel-API accesses are optional, but invoking it without the Babel API still has two incomplete fallback paths: `preset()` can read properties from an undefined options object, and `getPreset(code, {dev: false})` receives no transform profile and silently falls back to legacy class transforms instead of the normal `hermes-stable` default.
Default options to an empty object, consistently rely on that non-null invariant throughout the configuration builder, and apply `hermes-stable` when neither explicit options nor `babel.caller` provides a profile. Explicit options and caller-provided profiles retain precedence.
## Changelog:
[GENERAL] [FIXED] - Apply normal preset defaults when invoked without a Babel API or options object.
Pull Request resolved: react#58254
Test Plan:
- Added a regression proving `preset()` builds without options or a Babel API.
- Added a transform regression proving no-API invocation preserves classes under the default `hermes-stable` profile; exact baseline lowers the class to helpers.
- Full preset Jest passes: 4/4 suites, 112/112 tests, 16 snapshots.
- Fresh Flow check reports 0 errors.
- Targeted no-ignore ESLint, Prettier, and `git diff --check` pass.
No breaking change: explicit profiles/caller behavior are unchanged, while standalone invocation now matches the preset's documented default path.
Reviewed By: javache
Differential Revision: D118438065
Pulled By: vzaidman
fbshipit-source-id: e952eece72664dfa9d60d25d26955655e057f388
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Summary:
The preset's Babel-API accesses are optional, but invoking it without the Babel API still has two incomplete fallback paths:
preset()can read properties from an undefined options object, andgetPreset(code, {dev: false})receives no transform profile and silently falls back to legacy class transforms instead of the normalhermes-stabledefault.Default options to an empty object, consistently rely on that non-null invariant throughout the configuration builder, and apply
hermes-stablewhen neither explicit options norbabel.callerprovides a profile. Explicit options and caller-provided profiles retain precedence.Changelog:
[GENERAL] [FIXED] - Apply normal preset defaults when invoked without a Babel API or options object.
Test Plan:
preset()builds without options or a Babel API.hermes-stableprofile; exact baseline lowers the class to helpers.git diff --checkpass.No breaking change: explicit profiles/caller behavior are unchanged, while standalone invocation now matches the preset's documented default path.