/
index.js
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/
index.js
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import React, { Suspense } from 'react'
import { act, create } from 'react-test-renderer'
let cleanupCallbacks = []
function TestHook({ callback, hookProps, onError, children }) {
try {
children(callback(hookProps))
} catch (err) {
if (err.then) {
throw err
} else {
onError(err)
}
}
return null
}
function Fallback() {
return null
}
function resultContainer() {
let value = null
let error = null
const resolvers = []
const result = {
get current() {
if (error) {
throw error
}
return value
},
get error() {
return error
}
}
const updateResult = (val, err) => {
value = val
error = err
resolvers.splice(0, resolvers.length).forEach((resolve) => resolve())
}
return {
result,
addResolver: (resolver) => {
resolvers.push(resolver)
},
setValue: (val) => updateResult(val),
setError: (err) => updateResult(undefined, err)
}
}
function renderHook(callback, { initialProps, wrapper } = {}) {
const { result, setValue, setError, addResolver } = resultContainer()
const hookProps = { current: initialProps }
const wrapUiIfNeeded = (innerElement) =>
wrapper ? React.createElement(wrapper, null, innerElement) : innerElement
const toRender = () =>
wrapUiIfNeeded(
<Suspense fallback={<Fallback />}>
<TestHook callback={callback} hookProps={hookProps.current} onError={setError}>
{setValue}
</TestHook>
</Suspense>
)
let testRenderer
act(() => {
testRenderer = create(toRender())
})
const { unmount, update } = testRenderer
function unmountHook() {
act(() => {
cleanupCallbacks = cleanupCallbacks.filter((cb) => cb !== unmountHook)
unmount()
})
}
cleanupCallbacks.push(unmountHook)
let waitingForNextUpdate = null
const resolveOnNextUpdate = (resolve) => {
addResolver((...args) => {
waitingForNextUpdate = null
resolve(...args)
})
}
return {
result,
waitForNextUpdate: () => {
waitingForNextUpdate = waitingForNextUpdate || act(() => new Promise(resolveOnNextUpdate))
return waitingForNextUpdate
},
rerender: (newProps = hookProps.current) => {
hookProps.current = newProps
act(() => {
update(toRender())
})
},
unmount: unmountHook
}
}
async function cleanup() {
await act(async () => {
await act(async () => {})
cleanupCallbacks.forEach((cb) => cb())
cleanupCallbacks = []
})
}
if (typeof afterEach === 'function' && !process.env.RHTL_SKIP_AUTO_CLEANUP) {
afterEach(async () => {
await cleanup()
})
}
export { renderHook, cleanup, act }