export function logColdStartWarning()

in src/eventHandlers/WorkerInitHandler.ts [63:85]

• 20 lines of code
• 6 McCabe index (conditional complexity)

export function logColdStartWarning(delayInMs?: number): void {
    // On reading a js file with function code('require') NodeJs tries to find 'package.json' all the way up to the file system root.
    // In Azure files it causes a delay during cold start as connection to Azure Files is an expensive operation.
    const scriptRoot = process.env.AzureWebJobsScriptRoot;
    if (process.env.WEBSITE_CONTENTAZUREFILECONNECTIONSTRING && process.env.WEBSITE_CONTENTSHARE && scriptRoot) {
        // Add delay to avoid affecting coldstart
        if (!delayInMs) {
            delayInMs = 5000;
        }
        setTimeout(() => {
            access(path.join(scriptRoot, 'package.json'), constants.F_OK, (err) => {
                if (isError(err)) {
                    worker.log({
                        message:
                            'package.json is not found at the root of the Function App in Azure Files - cold start for NodeJs can be affected.',
                        level: LogLevel.Debug,
                        logCategory: LogCategory.System,
                    });
                }
            });
        }, delayInMs);
    }
}