function main() {
    const a = computeA();
    const b = computeB(a); // Say: computeB takes promise in input.
    const c = go(async cb => computeC(await b, cb)); // Say: computeC doesn't understand promise.
    const d = computeD(a, c); // Say: computeD takes promise in input.
    const e = computeE(b); // etc.
    const f = go(async cb => computeF(await b, await c, cb));
    const g = computeG(d)
    const h = computeH(d, f);
    const i = computeI(g);
    const j = go(async cb => computeJ(await g));

    // Usually just await j is enough if that is the final result you are interested in.
    return Promises.all([a, b, c, d, e, f, g, h, i, j]).then((res) => {
        console.log("All done");
    }, (err) => {
        console.error(err);
    })
}