56 lines
2.3 KiB
JavaScript
Executable File
56 lines
2.3 KiB
JavaScript
Executable File
/**
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* Schedules a function to be called on the next tick after the other promises
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* have been resolved.
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*
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* @param cb the function to schedule
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*/ export const scheduleOnNextTick = (cb)=>{
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// We use Promise.resolve().then() here so that the operation is scheduled at
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// the end of the promise job queue, we then add it to the next process tick
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// to ensure it's evaluated afterwards.
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//
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// This was inspired by the implementation of the DataLoader interface: https://github.com/graphql/dataloader/blob/d336bd15282664e0be4b4a657cb796f09bafbc6b/src/index.js#L213-L255
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//
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Promise.resolve().then(()=>{
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if (process.env.NEXT_RUNTIME === 'edge') {
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setTimeout(cb, 0);
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} else {
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process.nextTick(cb);
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}
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});
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};
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/**
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* Schedules a function to be called using `setImmediate` or `setTimeout` if
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* `setImmediate` is not available (like in the Edge runtime).
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*
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* @param cb the function to schedule
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*/ export const scheduleImmediate = (cb)=>{
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if (process.env.NEXT_RUNTIME === 'edge') {
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setTimeout(cb, 0);
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} else {
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setImmediate(cb);
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}
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};
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/**
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* returns a promise than resolves in a future task. There is no guarantee that the task it resolves in
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* will be the next task but if you await it you can at least be sure that the current task is over and
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* most usefully that the entire microtask queue of the current task has been emptied.
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*/ export function atLeastOneTask() {
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return new Promise((resolve)=>scheduleImmediate(resolve));
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}
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/**
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* This utility function is extracted to make it easier to find places where we are doing
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* specific timing tricks to try to schedule work after React has rendered. This is especially
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* important at the moment because Next.js uses the edge builds of React which use setTimeout to
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* schedule work when you might expect that something like setImmediate would do the trick.
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*
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* Long term we should switch to the node versions of React rendering when possible and then
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* update this to use setImmediate rather than setTimeout
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*/ export function waitAtLeastOneReactRenderTask() {
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if (process.env.NEXT_RUNTIME === 'edge') {
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return new Promise((r)=>setTimeout(r, 0));
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} else {
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return new Promise((r)=>setImmediate(r));
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}
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}
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//# sourceMappingURL=scheduler.js.map
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