async-stack-trace.js

"use strict";

function sleep() { return new Promise(resolve => setTimeout(resolve, 1)); }

class Query {
    constructor(f) {
        this.f = f;
    }
    then(onFulfilled, onRejected) {
        this.f()
            .then(r => onFulfilled ? onFulfilled(r) : r)
            .catch(onRejected);
    }
    async exec() {
        await this.f();
    }
}

async function f2() {
    await sleep();

    // Just await
    await new Query(async () => { throw new Error('blah'); });

    // Call exec()
    await new Query(async () => { throw new Error('blah'); }).exec();
}
async function f1() {
    await sleep();
    await f2();
}
async function mainAsync() {
    try {
        await f1();
    }
    catch (err) {
        console.log('err', err);
    }
}

if (require.main === module) {
    mainAsync().catch(err => {
        console.error(err);
        process.exit(1);
    });
}