next/dist/esm/shared/lib/turbopack/compilation-events.js

The React Framework

import * as Log from '../../../build/output/log';
import { flushAllTraces } from '../../../trace';
import { traceMemoryUsage } from '../../../lib/memory/trace';
const MILLISECONDS_IN_NANOSECOND = BigInt(1000000);
export function msToNs(ms) {
    return BigInt(Math.floor(ms)) * MILLISECONDS_IN_NANOSECOND;
}
/**
 * Subscribes to compilation events for `project` and prints them using the
 * `Log` library.
 *
 * When `parentSpan` is provided, `TraceEvent` compilation events are recorded
 * as trace spans in the `.next/trace` file.
 *
 * Returns a promise that resolves when the subscription ends.  Abort the
 * `signal` to close the underlying async iterator and settle the promise
 * promptly.  The iterator also closes automatically when the Rust side
 * drops the subscription (e.g. after project shutdown).
 */ export function backgroundLogCompilationEvents(project, { eventTypes, signal, parentSpan } = {}) {
    const iterator = project.compilationEventsSubscribe(eventTypes);
    // Close the iterator as soon as the signal fires so the for-await loop
    // exits without waiting for the next compilation event.
    signal?.addEventListener('abort', ()=>iterator.return?.(undefined), {
        once: true
    });
    const promise = async function() {
        for await (const event of iterator){
            // Record TraceEvent compilation events as trace spans in .next/trace.
            if (parentSpan && event.typeName === 'TraceEvent' && event.eventJson) {
                try {
                    const data = JSON.parse(event.eventJson);
                    parentSpan.manualTraceChild(data.name, msToNs(data.startTimeMs), msToNs(data.endTimeMs), Object.fromEntries(data.attributes ?? []));
                    traceMemoryUsage(data.name, parentSpan);
                    // We flush after each event to make sure it makes it to disk.  These events are rare and
                    // tend to happen at the very end of a build so to make sure they are logged we need to
                    // flush.
                    // NOTE: in a `next build` environment where we are reporting events to the parent thread, this is a no-op.
                    await flushAllTraces();
                } catch  {}
                continue; // don't log these events, they just go to the trace file
            }
            switch(event.severity){
                case 'EVENT':
                    Log.event(event.message);
                    break;
                case 'TRACE':
                    Log.trace(event.message);
                    break;
                case 'INFO':
                    Log.info(event.message);
                    break;
                case 'WARNING':
                    Log.warn(event.message);
                    break;
                case 'ERROR':
                    Log.error(event.message);
                    break;
                case 'FATAL':
                    Log.error(event.message);
                    break;
                default:
                    break;
            }
        }
    }();
    // Prevent unhandled rejection if the subscription errors after the project shuts down.
    promise.catch(()=>{});
    return promise;
}

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