Function install

e2e/src/recording-url-bar.ts:27–95

()

  const BAR_H = 32;

  const install = (): void => {
    const root = document.documentElement;
    if (!root) return;

    const host = document.createElement("div");
    host.style.cssText = `position:fixed;top:0;left:0;width:100%;height:${BAR_H}px;z-index:2147483647;pointer-events:none`;
    const shadow = host.attachShadow({ mode: "closed" });

    const bar = document.createElement("div");
    bar.style.cssText = [
      "display:flex",
      "align-items:center",
      "gap:8px",
      `height:${BAR_H}px`,
      "box-sizing:border-box",
      "padding:0 12px",
      "background:#161b22",
      "border-bottom:1px solid #21262d",
      "font:13px/1 ui-monospace,SFMono-Regular,Menlo,monospace",
      "color:#c9d1d9",
      "white-space:nowrap",
      "overflow:hidden",
    ].join(";");

    const dot = (color: string): HTMLElement => {
      const d = document.createElement("span");
      d.style.cssText = `width:11px;height:11px;border-radius:50%;flex:none;background:${color}`;
      return d;
    };
    const lights = document.createElement("span");
    lights.style.cssText = "display:inline-flex;gap:6px;margin-right:4px";
    lights.append(dot("#ff5f57"), dot("#febc2e"), dot("#28c840"));

    const lock = document.createElement("span");
    lock.textContent = "⌁"; // the viewer's URL-bar glyph
    lock.style.cssText = "color:#8b949e;flex:none";

    const url = document.createElement("span");
    url.style.cssText = "overflow:hidden;text-overflow:ellipsis";

    bar.append(lights, lock, url);
    shadow.append(bar);
    root.appendChild(host);

    const render = (): void => {
      const next = location.href.replace(/^https?:\/\//, "") || "about:blank";
      if (url.textContent !== next) url.textContent = next;
    };
    render();

    // SPA route changes don't reload the document, so re-read the URL on every
    // history transition; the interval also re-attaches the bar if a framework
    // re-render detached it, and is the catch-all for navigations we can't hook.
    window.setInterval(() => {
      if (!root.contains(host)) root.appendChild(host);
      render();
    }, 250);
    for (const ev of ["popstate", "hashchange"] as const) window.addEventListener(ev, render);