next/dist/esm/server/client-component-renderer-logger.js

The React Framework

// Combined load times for loading client components
let clientComponentLoadStart = 0;
let clientComponentLoadTimes = 0;
let clientComponentLoadCount = 0;
export function wrapClientComponentLoader(ComponentMod) {
    if (!('performance' in globalThis)) {
        return ComponentMod.__next_app__;
    }
    return {
        require: (...args)=>{
            const startTime = performance.now();
            if (clientComponentLoadStart === 0) {
                clientComponentLoadStart = startTime;
            }
            try {
                clientComponentLoadCount += 1;
                return ComponentMod.__next_app__.require(...args);
            } finally{
                clientComponentLoadTimes += performance.now() - startTime;
            }
        },
        loadChunk: (...args)=>{
            const startTime = performance.now();
            const result = ComponentMod.__next_app__.loadChunk(...args);
            // Avoid wrapping `loadChunk`'s result in an extra promise in case something like React depends on its identity.
            // We only need to know when it's settled.
            result.finally(()=>{
                clientComponentLoadTimes += performance.now() - startTime;
            });
            return result;
        }
    };
}
export function getClientComponentLoaderMetrics(options = {}) {
    const metrics = clientComponentLoadStart === 0 ? undefined : {
        clientComponentLoadStart,
        clientComponentLoadTimes,
        clientComponentLoadCount
    };
    if (options.reset) {
        clientComponentLoadStart = 0;
        clientComponentLoadTimes = 0;
        clientComponentLoadCount = 0;
    }
    return metrics;
}

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