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';
import { isThenable } from '../../shared/lib/is-thenable';
function noop() {}
/**
 * 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 first function runs in the first task. Each subsequent function runs in its own task.
 * The returned promise resolves after the last task completes.
 */ export function runInSequentialTasks(first, ...rest) {
    if (process.env.NEXT_RUNTIME === 'edge') {
        throw Object.defineProperty(new InvariantError('`runInSequentialTasks` should not be called in edge runtime.'), "__NEXT_ERROR_CODE", {
            value: "E1054",
            enumerable: false,
            configurable: true
        });
    } else {
        return new Promise((resolve, reject)=>{
            const scheduleTimeout = createAtomicTimerGroup();
            const ids = [];
            let result;
            ids.push(scheduleTimeout(()=>{
                try {
                    DANGEROUSLY_runPendingImmediatesAfterCurrentTask();
                    result = first();
                    // If the first function returns a thenable, suppress unhandled
                    // rejections. A later task in the sequence (e.g. an abort) may
                    // cause the promise to reject, and we don't want that to surface
                    // as an unhandled rejection — the caller will observe the
                    // rejection when they await the returned promise.
                    if (isThenable(result)) {
                        result.then(noop, noop);
                    }
                } catch (err) {
                    for(let i = 1; i < ids.length; i++){
                        clearTimeout(ids[i]);
                    }
                    reject(err);
                }
            }));
            for(let i = 0; i < rest.length; i++){
                const fn = rest[i];
                let index = ids.length;
                ids.push(scheduleTimeout(()=>{
                    try {
                        DANGEROUSLY_runPendingImmediatesAfterCurrentTask();
                        fn();
                    } catch (err) {
                        // clear remaining timeouts
                        while(++index < ids.length){
                            clearTimeout(ids[index]);
                        }
                        reject(err);
                    }
                }));
            }
            // We wait a task before resolving
            ids.push(scheduleTimeout(()=>{
                try {
                    expectNoPendingImmediates();
                    resolve(result);
                } catch (err) {
                    reject(err);
                }
            }));
        });
    }
}

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