davidbarral

const { callbackify } = require("util");

const evenSuccess = n => n % 2 ? Promise.reject("odd") : Promise.resolve("even");

callbackify(evenSuccess)(1, console.log); // "odd"
callbackify(evenSuccess)(2, console.log); // undefined "even"

davidbarral

const CUSTOM = Symbol("promisify.custom");

const promisify = fn => {
  if (fn[CUSTOM]) {
    return fn[CUSTOM];
  }

  return (...args) => new Promise((resolve, reject) => {
    fn(...args, (error, value) => {
      if (error) {

davidbarral

const { promisify } from "util";

const evenSuccess = (n, onSuccess, onError) => {
  if (n % 2) {
    onError(n);
  } else {
    onSuccess(n);
  }
};

davidbarral

const { promisify } = require("util");
const jwt = require("jsonwebtoken");

const jwtVerify = promisify(jwt.verify);

const verifyToken = token => jwtVerify(token, CERTIFICATE, { algorithms: ["RS256"] });

davidbarral

const jwt = require("jsonwebtoken");

const promisify = fn => (...args) => new Promise((resolve, reject) => {
    fn(...args, (error, value) => {
      if (error) {
        reject(error);
      } else {
        resolve(value);
      }
  });

davidbarral

const usefulFunction = async () => {
  try {
    const payload = await verifyToken(token);
    return payload;
  } catch(e) {
    console.error("Bad token", e);
  }
};

davidbarral

const jwt = require("jsonwebtoken");

const verifyToken = token => new Promise((resolve, reject) => {
  jwt.verify(token, CERTIFICATE, { algorithms: ["RS256"] }, (error, payload) => {
    if (error) {
      reject(error);
    } else {
      resolve(payload);
    }
  });

davidbarral

const callbackify = fn => (...args) => {
  const callback = args[args.length - 1];
  const fnArgs = args.slice(0, -1);
  fn(...fnArgs)
    .then(value => {
      callback(undefined, value);
    })
    .catch(error => {
      callback(error);
    });

davidbarral

import React, { Component } from "react";
import PropTypes from "prop-types";
import ReactDOM from 'react-dom';


// Toy redux ----------------------------------------------------------

const createStore = (reducer, initialState) => {
  let state = initialState;
  let subscribers = [];

davidbarral

# Completions for npmenv.fish

function __fish_npmenv_needs_command
  set cmd (commandline -opc)
  if [ (count $cmd) -eq 1 -a $cmd[1] = 'npmenv' ]
    return 0
  end
  return 1
end