browser/components/sessionstore/test/unit/head.js


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ChromeUtils.defineESModuleGetters(this, {
  SessionStartup: "resource:///modules/sessionstore/SessionStartup.sys.mjs",
});

// Call a function once initialization of SessionStartup is complete
function afterSessionStartupInitialization(cb) {
  info("Waiting for session startup initialization");
  let observer = function () {
    try {
      info("Session startup initialization observed");
      Services.obs.removeObserver(observer, "sessionstore-state-finalized");
      cb();
    } catch (ex) {
      do_throw(ex);
    }
  };
  Services.obs.addObserver(observer, "sessionstore-state-finalized");

  // We need the Crash Monitor initialized for sessionstartup to run
  // successfully.
  const { CrashMonitor } = ChromeUtils.importESModule(
    "resource://gre/modules/CrashMonitor.sys.mjs"
  );
  CrashMonitor.init();

  // Start sessionstartup initialization.
  SessionStartup.init();
}

// Compress the source file using lz4 and put the result to destination file.
// After that, source file is deleted.
async function writeCompressedFile(source, destination) {
  let s = await IOUtils.read(source);
  await IOUtils.write(destination, s, { compress: true });
  await IOUtils.remove(source);
}