88 lines
1.9 KiB
TypeScript
88 lines
1.9 KiB
TypeScript
const queue: Function[] = []
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const postFlushCbs: Function[] = []
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const p = Promise.resolve()
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let isFlushing = false
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export function nextTick(fn?: () => void): Promise<void> {
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return fn ? p.then(fn) : p
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}
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type ErrorHandler = (err: Error) => void
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export function queueJob(job: () => void, onError?: ErrorHandler) {
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if (queue.indexOf(job) === -1) {
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queue.push(job)
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queueFlush(onError)
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}
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}
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export function queuePostFlushCb(
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cb: Function | Function[],
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onError?: ErrorHandler
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) {
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if (Array.isArray(cb)) {
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postFlushCbs.push.apply(postFlushCbs, cb)
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} else {
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postFlushCbs.push(cb)
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}
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queueFlush(onError)
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}
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function queueFlush(onError?: ErrorHandler) {
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if (!isFlushing) {
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const p = nextTick(flushJobs)
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if (onError) p.catch(onError)
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}
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}
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const dedupe = (cbs: Function[]): Function[] => Array.from(new Set(cbs))
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export function flushPostFlushCbs() {
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if (postFlushCbs.length) {
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const cbs = dedupe(postFlushCbs)
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postFlushCbs.length = 0
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for (let i = 0; i < cbs.length; i++) {
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cbs[i]()
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}
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}
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}
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const RECURSION_LIMIT = 100
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type JobCountMap = Map<Function, number>
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function flushJobs(seenJobs?: JobCountMap) {
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isFlushing = true
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let job
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if (__DEV__) {
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seenJobs = seenJobs || new Map()
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}
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while ((job = queue.shift())) {
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if (__DEV__) {
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const seen = seenJobs as JobCountMap
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if (!seen.has(job)) {
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seen.set(job, 1)
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} else {
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const count = seen.get(job) as number
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if (count > RECURSION_LIMIT) {
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throw new Error(
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'Maximum recursive updates exceeded. ' +
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"You may have code that is mutating state in your component's " +
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'render function or updated hook.'
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)
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} else {
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seen.set(job, count + 1)
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}
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}
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}
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job()
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}
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flushPostFlushCbs()
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isFlushing = false
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// some postFlushCb queued jobs!
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// keep flushing until it drains.
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if (queue.length) {
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flushJobs(seenJobs)
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}
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}
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