ほしいもの

Promise.progress.js

const PP = require('progressive-promise');

const p = new PP((resolve, reject, progress) => {
  const total = 100;
  let count = 0;
  const intvl = setInterval(() => {
    count += 1;
    if (count > total) {
      clearInterval(intvl);
      return resolve(count);
    }
    progress(count);
  });
});

p.progress(val => {
  console.log("途中", val);
}).then(val => {
  console.log("完了", val);
}).catch(err => {
  console.log("失敗", err);
});