How does async/await work in Node?

Question

Node.js

Code example:

const fs = require('fs');
const keypair = require('keypair');


console.log('Before');

async function generate(bits=2048) {
  let pair = await new Promise((res, rej) => {
    res(keypair({
      bits
    }));
  });
  console.log('Generated');
  fs.writeFileSync('./private.key', pair['private']);
  fs.writeFileSync('./public.key', pair['public']);
}

generate(2048);

console.log('After');

Result:

$ node keypair.js
Before
# Ожидание 2-8 сек
After
Generated

Isn't that how it should be?

$ node keypair.js
Before
After
# Ожидание 2-8 сек
Generated

Answer 1

No, it shouldn't. Promise immediately returns a resolve with this function, which is executed. In order for it to be the way you want, the keypair function itself must return a promise, which will then be awaited by await.