import { createSession } from "chrome-debugging-client";
// import protocol domains "1-2", "tot", or "v8"
import { HeapProfiler } from "chrome-debugging-client/dist/protocol/tot";

createSession(async (session) => {
  // spawns a chrome instance with a tmp user data
  // and the debugger open to an ephemeral port
  const process = await session.spawn("canary", {
    additionalArguments: ['--headless'],
    windowSize: { width: 640, height: 320 }
  });

  // open the REST API for tabs
  const client = session.createAPIClient("localhost", process.remoteDebuggingPort);

  const tabs = await client.listTabs();
  const tab = tabs[0];
  await client.activateTab(tab.id);

  // open the debugger protocol
  // https://chromedevtools.github.io/devtools-protocol/
  const debuggerClient = await session.openDebuggingProtocol(tab.webSocketDebuggerUrl);

  // create the HeapProfiler domain with the debugger protocol client
  const heapProfiler = new HeapProfiler(debuggerClient);
  await heapProfiler.enable();

  // The domains are optional, this can also be
  // await debuggerClient.send("HeapProfiler.enable", {})

  let buffer = "";
  heapProfiler.addHeapSnapshotChunk = (evt) => {
    buffer += evt.chunk;
  });
  await heapProfiler.takeHeapSnapshot({ reportProgress: false });
  await heapProfiler.disable();

  return JSON.parse(buffer);
}).then((data) => {
  console.log(data.snapshot.meta);
}).catch((err) => {
  console.error(err);
});

// example for macOS
let browser = await session.spawnBrowser('exact', {
 executablePath: '/Users/someone/Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary'
});