Function trigger

packages/qwik/src/core/preloader/queue.ts:71–104

()

 * We make sure to first preload the high priority items.
 */
export const trigger = () => {
  if (!queue.length) {
    return;
  }
  sortQueue();
  while (queue.length) {
    const bundle = queue[0];
    const inverseProbability = bundle.$inverseProbability$;
    const probability = 1 - inverseProbability;
    const allowedPreloads = graph
      ? config.$maxIdlePreloads$
      : // While the graph is not available, we limit to 5 preloads
        5;
    // When we're 99% sure, everything needs to be queued
    if (probability >= 0.99 || preloadCount < allowedPreloads) {
      queue.shift();
      preloadOne(bundle);
    } else {
      break;
    }
  }
  /**
   * The low priority bundles are opportunistic, and we want to give the browser some breathing room
   * for other resources, so we cycle between 4 and 10 outstanding modulepreloads.
   */
  if (config.$DEBUG$ && !queue.length) {
    const loaded = [...bundles.values()].filter((b) => b.$state$ > BundleImportState_None);
    const waitTime = loaded.reduce((acc, b) => acc + b.$waitedMs$, 0);
    const loadTime = loaded.reduce((acc, b) => acc + b.$loadedMs$, 0);
    log(
      `>>>> done ${loaded.length}/${bundles.size} total: ${waitTime}ms waited, ${loadTime}ms loaded`
    );
  }
};

const preloadOne = (bundle: BundleImport) => {
  if (bundle.$state$ >= BundleImportState_Preload) {