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add debugStore testUtil #2941

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add debugStore testUtil #2941

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24 changes: 24 additions & 0 deletions tests/testUtils.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
import { createStore } from 'jotai'

type Store = ReturnType<typeof createStore>
type GetAtomState = Parameters<Parameters<Store['unstable_derive']>[0]>[0]
type DebugStore = Store & { getAtomState: GetAtomState }

export function createDebugStore() {
let getAtomState: GetAtomState
const store = createStore().unstable_derive((...storeArgs) => {
;[getAtomState] = storeArgs
const [, setAtomState] = storeArgs
storeArgs[1] = (atom, atomState) => {
return setAtomState(
atom,
Object.assign(atomState, { label: atom.debugLabel }),
)
}
return storeArgs
})
if (getAtomState! === undefined) {
throw new Error('failed to create debug store')
}
return Object.assign(store, { getAtomState }) as DebugStore
}
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