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fix(vanilla): remove Object.preventExtensions from createSnapshotDefault for Hermes compatibility #1220

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Merged
dai-shi merged 2 commits into from
May 1, 2026
+2 −21
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fix(vanilla): remove Object.preventExtensions from createSnapshotDefault for Hermes compatibility #1220

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d6e2780
fix(vanilla): remove immutability enforcement in snapshot
manakuro Apr 12, 2026
3510558
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dai-shi Apr 13, 2026
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3 changes: 2 additions & 1 deletion src/vanilla.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,8 @@ const createSnapshotDefault = <T extends object>(
}
Object.defineProperty(snap, key, desc)
})
return Object.preventExtensions(snap)
// Object.preventExtensions is removed. ref: https://github.com/pmndrs/valtio/pull/1220
return snap
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}

const createHandlerDefault = <T extends object>(
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20 changes: 0 additions & 20 deletions tests/snapshot.test.ts
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Expand Up @@ -24,26 +24,6 @@ describe('snapshot', () => {
expect(snap1).toBe(snap2)
})

it('should make the snapshot immutable', () => {
const state = proxy<{ foo: number; bar?: string }>({ foo: 1 })
const snap = snapshot(state)

// Overwriting existing property
expect(() => {
;(snap as typeof state).foo = 100
}).toThrow()

// Extension (adding new property)
expect(() => {
;(snap as typeof state).bar = 'hello'
}).toThrow()

// Note: The current implementation does not prevent property removal.
// Do not add a test for this unless we come up with an implementation that
// supports it.
// See https://github.com/pmndrs/valtio/issues/749
})

it('should not cause proxy-compare to copy', async () => {
const state = proxy({ foo: 1 })
const snap1 = snapshot(state)
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