next
Version:
The React Framework
76 lines (75 loc) • 2.98 kB
JavaScript
import { InvariantError } from '../../shared/lib/invariant-error';
/**
* This is a utility function to make scheduling sequential tasks that run back to back easier.
* We schedule on the same queue (setTimeout) at the same time to ensure no other events can sneak in between.
*/ export function scheduleInSequentialTasks(render, followup) {
if (process.env.NEXT_RUNTIME === 'edge') {
throw Object.defineProperty(new InvariantError('`scheduleInSequentialTasks` should not be called in edge runtime.'), "__NEXT_ERROR_CODE", {
value: "E591",
enumerable: false,
configurable: true
});
} else {
return new Promise((resolve, reject)=>{
let pendingResult;
setTimeout(()=>{
try {
pendingResult = render();
} catch (err) {
reject(err);
}
}, 0);
setTimeout(()=>{
followup();
resolve(pendingResult);
}, 0);
});
}
}
/**
* This is a utility function to make scheduling sequential tasks that run back to back easier.
* We schedule on the same queue (setTimeout) at the same time to ensure no other events can sneak in between.
* The function that runs in the second task gets access to the first tasks's result.
*/ export function pipelineInSequentialTasks(one, two, three) {
if (process.env.NEXT_RUNTIME === 'edge') {
throw Object.defineProperty(new InvariantError('`pipelineInSequentialTasks` should not be called in edge runtime.'), "__NEXT_ERROR_CODE", {
value: "E875",
enumerable: false,
configurable: true
});
} else {
return new Promise((resolve, reject)=>{
let oneResult = undefined;
setTimeout(()=>{
try {
oneResult = one();
} catch (err) {
clearTimeout(twoId);
clearTimeout(threeId);
reject(err);
}
}, 0);
let twoResult = undefined;
const twoId = setTimeout(()=>{
// if `one` threw, then this timeout would've been cleared,
// so if we got here, we're guaranteed to have a value.
try {
twoResult = two(oneResult);
} catch (err) {
clearTimeout(threeId);
reject(err);
}
}, 0);
const threeId = setTimeout(()=>{
// if `two` threw, then this timeout would've been cleared,
// so if we got here, we're guaranteed to have a value.
try {
resolve(three(twoResult));
} catch (err) {
reject(err);
}
}, 0);
});
}
}
//# sourceMappingURL=app-render-render-utils.js.map