// @ts-check

/* eslint-env node, es2020 */

import playwright from 'playwright';

import {startDevServer} from '@web/dev-server';

import getPort from 'get-port';

async function main() {

const verbose = process.argv.includes('--verbose');

const port = await getPort();

const server = await startDevServer({

config: {

rootDir: process.cwd(),

port,

watch: false,

},

readCliArgs: false,

readFileConfig: false,

logStartMessage: verbose,

});

const browserType = 'chromium';

const browser = await playwright[browserType].launch();

const context = await browser.newContext();

const page = await context.newPage();

await page.goto(`http://127.0.0.1:${port}/perf/index.html`);

await page.waitForFunction('typeof nextTest === "function"');

logLine('Running benchmarks please wait...');

for (;;) {

const testResult = await page.evaluate('nextTest()');

if (testResult === null) {

break;

}

logLine(formatAsBenchmarkJS(testResult));

}

logLine('Done!');

await browser.close();

await server.stop();

}

main();

/** @param {string} s */

function logLine(s) {

process.stdout.write(s + '\n');

}

// TODO(arv): Use BenchmarkJS instead of our custom runner?

// eslint-disable-next-line @typescript-eslint/no-unused-vars

function formatAsBenchmarkJS({name, value, median}) {

// Example:

// fib(20) x 11,465 ops/sec ±1.12% (91 runs sampled)

// createObjectBuffer with 200 comments x 81.61 ops/sec ±1.70% (69 runs sampled)

return `${name} x ${value} ±0.0% (0 runs sampled)`;

}