karma-benchmark-reporter.cjs

const chalk = require("chalk");
const Table = require("tty-table");

exports["reporter:benchmark"] = ["type", BenchmarkReporter];

function BenchmarkReporter(baseReporterDecorator) {
  baseReporterDecorator(this);
  const resultsPerBrowser = new Map();
  this.onBrowserInfo = function (browser, info) {
    if (!info.benchmark) return;
    if (!resultsPerBrowser.has(browser.name)) {
      resultsPerBrowser.set(browser.name, info.benchmark);
    }
  };
  this.onRunComplete = function () {
    if (resultsPerBrowser.size === 0) return;
    this.writeCommonMsg(
      chalk.underline.bold("\nBENCHMARK (times in seconds):\n")
    );
    resultsPerBrowser.forEach((results, browserName) => {
      this.writeCommonMsg(`  ${chalk.bold(browserName)}:\n`);
      const rows = results.map(({ cur, ref }, i) => ({
        i: String(i),
        cur: cur.toFixed(0),
        ref: ref.toFixed(0),
        diff: `${((cur / ref) * 100).toFixed(2)}%`,
      }));
      const header = [
        {
          value: "i",
          align: "right",
        },
        {
          value: "ref",
          align: "right",
        },
        {
          value: "cur",
          align: "right",
        },
        {
          value: "diff",
          align: "right",
        },
      ];
      console.log(Table(header, rows).render());
    });
    resultsPerBrowser.clear();
  };
}