File: helper.js

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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

const KB = 1024;
const MB = KB * KB;
const GB = MB * KB;
const kMillis2Seconds = 1 / 1000;

function formatBytes(bytes) {
  const units = ['B', 'KiB', 'MiB', 'GiB'];
  const divisor = 1024;
  let index = 0;
  while (index < units.length && bytes >= divisor) {
    index++;
    bytes /= divisor;
  }
  return bytes.toFixed(2) + units[index];
}

function formatSeconds(millis) {
  return (millis * kMillis2Seconds).toFixed(2) + 's';
}

function defineCustomElement(name, generator) {
  let htmlTemplatePath = name + '-template.html';
  fetch(htmlTemplatePath)
    .then(stream => stream.text())
    .then(templateText => customElements.define(name, generator(templateText)));
}