v8-deopt-generate-log
Given a JavaScript file or URL, run the file or webpage and save a log of V8 optimizations and deoptimizations.
Installation
Check out
v8-deopt-viewerfor a CLI that automates this for you!
Requires NodeJS 14.x or greater.
npm i v8-deopt-generate-log
Also install puppeteer if you plan to generate logs for URLs or HTML files:
npm i puppeteerUsage
See index.d.ts for the latest API. A snapshot is below.
interface Options {
/** Path to store the V8 log file. Defaults to your OS temporary directory */
logFilePath?: string;
/**
* How long the keep the browser open to allow the webpage to run before
* closing the browser
*/
browserTimeoutMs?: number;
}
/**
* Generate a V8 log of optimizations and deoptimizations for the given JS or
* HTML file
* @param srcPath The path or URL to run
* @param options Options to influence how the log is generated
* @returns The path to the generated V8 log file
*/
export async function generateV8Log(
srcPath: string,
options?: Options
): Promise<string>;