debug a node that's not terminating

node_hang_debug.js

const async_hooks = require('async_hooks');
let indent = 0;
const fs = require('fs');
const map  = new Map();

async_hooks.createHook({
  init(asyncId, type, triggerAsyncId, resource) {
    const eid = async_hooks.executionAsyncId();
    const indentStr = ' '.repeat(indent);
    fs.writeSync(
      1,
      `${indentStr}${type}(${asyncId}):` +
      ` trigger: ${triggerAsyncId} execution: ${eid}\n`);
    map.set(asyncId, {type, triggerAsyncId, resource, stack : new Error().stack});
  },
  before(asyncId) {
    const indentStr = ' '.repeat(indent);
    fs.writeSync(1, `${indentStr}before:  ${asyncId}\n`);
    indent += 2;
  },
  after(asyncId) {
    indent -= 2;
    const indentStr = ' '.repeat(indent);
    fs.writeSync(1, `${indentStr}after:   ${asyncId}\n`);
  },
  destroy(asyncId) {
    const indentStr = ' '.repeat(indent);
    fs.writeSync(1, `${indentStr}destroy: ${asyncId}\n`);
    map.delete(asyncId);
  },
  promiseResolve(asyncId){
    const indentStr = ' '.repeat(indent);
    fs.writeSync(1, `${indentStr}resolve: ${asyncId}\n`);
    map.delete(asyncId);
  }
}).enable();

setTimeout(() => {
  debugger;
  console.log(map);
}, 5000);