next/dist/esm/server/app-render/app-render-render-utils.js

The React Framework

import { InvariantError } from '../../shared/lib/invariant-error';
import { createAtomicTimerGroup } from './app-render-scheduling';
import { DANGEROUSLY_runPendingImmediatesAfterCurrentTask, expectNoPendingImmediates } from '../node-environment-extensions/fast-set-immediate.external';
/**
 * 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)=>{
            const scheduleTimeout = createAtomicTimerGroup();
            let pendingResult;
            scheduleTimeout(()=>{
                try {
                    DANGEROUSLY_runPendingImmediatesAfterCurrentTask();
                    pendingResult = render();
                } catch (err) {
                    reject(err);
                }
            });
            scheduleTimeout(()=>{
                try {
                    expectNoPendingImmediates();
                    followup();
                    resolve(pendingResult);
                } catch (err) {
                    reject(err);
                }
            });
        });
    }
}
/**
 * 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)=>{
            const scheduleTimeout = createAtomicTimerGroup();
            let oneResult;
            scheduleTimeout(()=>{
                try {
                    DANGEROUSLY_runPendingImmediatesAfterCurrentTask();
                    oneResult = one();
                } catch (err) {
                    clearTimeout(twoId);
                    clearTimeout(threeId);
                    clearTimeout(fourId);
                    reject(err);
                }
            });
            let twoResult;
            const twoId = scheduleTimeout(()=>{
                // if `one` threw, then this timeout would've been cleared,
                // so if we got here, we're guaranteed to have a value.
                try {
                    DANGEROUSLY_runPendingImmediatesAfterCurrentTask();
                    twoResult = two(oneResult);
                } catch (err) {
                    clearTimeout(threeId);
                    clearTimeout(fourId);
                    reject(err);
                }
            });
            let threeResult;
            const threeId = scheduleTimeout(()=>{
                // if `two` threw, then this timeout would've been cleared,
                // so if we got here, we're guaranteed to have a value.
                try {
                    expectNoPendingImmediates();
                    threeResult = three(twoResult);
                } catch (err) {
                    clearTimeout(fourId);
                    reject(err);
                }
            });
            // We wait a task before resolving/rejecting
            const fourId = scheduleTimeout(()=>{
                resolve(threeResult);
            });
        });
    }
}

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