next/dist/esm/lib/require-instrumentation-client.js

The React Framework

/**
 * This module imports the configured client instrumentation modules.
 *
 * The `private-next-instrumentation-client` module is automatically aliased to
 * either the user's instrumentation module or a generated module array.
 */ if (process.env.NODE_ENV === 'development') {
    const measureName = 'Client Instrumentation Hook';
    const startTime = performance.now();
    // eslint-disable-next-line @next/internal/typechecked-require -- Not a module.
    const instrumentationClient = require('private-next-instrumentation-client');
    module.exports = Array.isArray(instrumentationClient) ? instrumentationClient : [
        instrumentationClient
    ];
    const endTime = performance.now();
    const duration = endTime - startTime;
    // Using 16ms threshold as it represents one frame (1000ms/60fps)
    // This helps identify if the instrumentation hook initialization
    // could potentially cause frame drops during development.
    const THRESHOLD = 16;
    if (duration > THRESHOLD) {
        console.log(`[${measureName}] Slow execution detected: ${duration.toFixed(0)}ms (Note: Code download overhead is not included in this measurement)`);
    }
} else {
    // eslint-disable-next-line @next/internal/typechecked-require -- Not a module.
    const instrumentationClient = require('private-next-instrumentation-client');
    module.exports = Array.isArray(instrumentationClient) ? instrumentationClient : [
        instrumentationClient
    ];
}

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