fix!: hooks start undefined, useViewModelInstance returns {instance, error}#184
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fix!: hooks start undefined, useViewModelInstance returns {instance, error}#184
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HayesGordon
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…error} useRiveNumber/String/Boolean/Color/Enum hooks start as undefined — the real value arrives via listener. useViewModelInstance returns a discriminated union: undefined (loading), null (resolved empty/error), or ViewModelInstance (success).
Align useRiveFile with useViewModelInstance semantics: riveFile is undefined while loading (was null), error is Error object (was string). isLoading kept for convenience. Memoize error in useViewModelInstance, accept undefined source to avoid ?? null at call sites.
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🤖 I have created a release *beep* *boop* --- ## [0.4.0](v0.3.4...v0.4.0) (2026-03-30) ### ⚠ BREAKING CHANGES * hooks start undefined, useViewModelInstance returns {instance, error} ([#184](#184)) ### Bug Fixes * hooks start undefined, useViewModelInstance returns {instance, error} ([#184](#184)) ([059e5f4](059e5f4)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
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Breaking changes to improve state transparency and prepare for the async experimental runtime.
useRiveFileerror is nowErrorinstead ofstring, andriveFileisundefinedwhile loading (wasnull).isLoadingis kept for convenience. Migration:{error}in JSX →{error.message}, and if checkingriveFiletype,nullnow means error not loading.useViewModelInstancereturns{ instance, error }discriminated union instead ofViewModelInstance | null. Now acceptsundefinedsource so you can passuseRiveFile().riveFiledirectly:{ instance: undefined, error: null }— loading (source not ready){ instance: ViewModelInstance, error: null }— success{ instance: null, error: null }— resolved, no ViewModel{ instance: null, error: Error }— lookup failedrequired: truethrows onnullbut notundefined(loading). Migration:const vmi = useViewModelInstance(file)→const { instance, error } = useViewModelInstance(file).useRiveNumber/String/Boolean/Color/Enumhooks start asundefinedinstead of readingproperty.valuesynchronously. The real value arrives via the listener's first emission.