next/dist/server/lib/cpu-profile.js

The React Framework

"use strict";
const privateCpuProfileName = process.env.__NEXT_PRIVATE_CPU_PROFILE;
const isCpuProfileEnabled = process.env.NEXT_CPU_PROF || privateCpuProfileName;
if (isCpuProfileEnabled) {
    const { Session } = require('inspector');
    const fs = require('fs');
    const session = new Session();
    session.connect();
    session.post('Profiler.enable');
    session.post('Profiler.start');
    function saveProfile() {
        session.post('Profiler.stop', (error, param)=>{
            if (error) {
                console.error('Cannot generate CPU profiling:', error);
                return;
            }
            // Write profile to disk
            const filename = `${privateCpuProfileName || 'CPU.main'}.${Date.now()}.cpuprofile`;
            fs.writeFileSync(`./${filename}`, JSON.stringify(param.profile));
            process.exit(0);
        });
    }
    process.on('SIGINT', saveProfile);
    process.on('SIGTERM', saveProfile);
    process.on('exit', saveProfile);
}

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