magic.js

const async_hooks = require('async_hooks');

const triggerMap = {};

const asyncId = async_hooks.executionAsyncId();
const triggerId = async_hooks.triggerAsyncId();

const envs = {};
global.env = undefined;
let lastResolvedPromiseAsyncId;

const hooks = {
    init(asyncId, type, triggerAsyncId) {
        triggerMap[asyncId] = triggerAsyncId;
        envs[asyncId] = Object.create(envs[triggerMap[asyncId]] || null );
    },
    before(asyncId) {
        lastResolvedPromiseAsyncId = undefined;
        global.env = envs[asyncId];
    },
    after(asyncId) {
        envs[asyncId] = global.env;
        Object.keys(triggerMap).forEach(triggeredAsyncId => {
            if (triggerMap[triggeredAsyncId] === asyncId) {
                Reflect.setPrototypeOf(envs[triggeredAsyncId], global.env);
            }
        });
        global.env = envs[triggerMap[asyncId]];
    },
    promiseResolve(asyncId) {
        lastResolvedPromiseAsyncId = asyncId;
    }
};

hooks.init(asyncId, 'Root', triggerId);
hooks.before(asyncId);
async_hooks.createHook(hooks).enable();