index.js

const execa = require("execa");
const chalk = require("chalk");
const branch = require("git-branch");
const Listr = require("listr");
const checkDependencies = require("check-dependencies");
const isOnline = require("is-online");

async function execPrestart() {
  const { stdout: nodeVersion } = await execa("node", ["-v"]);
  const { stdout: gitEmail } = await execa("git", ["config", "user.email"]);
  const branchName = branch.sync();

  console.log("🔑 ", "", chalk.bold("PreStart"));
  console.log("");

  console.log(chalk.bold("Project details"));
  console.log(chalk.gray("--------------------------------------------"));
  console.log("node  ", "version  ", nodeVersion.replace("v", ""));
  console.log("git   ", "branch   ", branchName);
  console.log("      ", "email    ", gitEmail);
  console.log(chalk.gray("--------------------------------------------"));
  console.log("");

  const tasks = new Listr([
    {
      title: `${chalk.grey("[1/2]")} 🔌   Checking connection...`,
      task: (ctx, task) => {
        return isOnline({ timeout: 2500 }).then(online => {
          ctx.isOnline = online;
        });
      }
    },
    {
      title: `${chalk.grey("[2/2]")} 🚚   Fetching packages...`,
      task: (ctx, task) => {
        if (!ctx.isOnline) {
          task.skip(
            "Looks like you're offline. We'll skip dependency fetching."
          );
        }

        const hasDependencies = checkDependencies.sync({
          checkGitUrls: true,
          install: false,
          packageManager: "npm",
          verbose: false
        }).depsWereOk;

        if (hasDependencies) {
          return Promise.resolve();
        } else {
          return execa("npm", ["install"]);
        }
      }
    }
  ]);

  tasks
    .run()
    .then(() => {
      console.log("");
      console.log(chalk.green("Success!"));
      console.log("✨ ", "Have fun developing!");
      console.log("");
    })
    .catch(err => {
      console.log("");
      console.log(chalk.red("Error!"));
      console.error(err);
      console.log("");
    });
}

function Prestart() {
  return execPrestart();
}

function sync(cb) {
  new Prestart().then(cb).catch(cb);
}

function prestart() {
  return new Prestart();
}

prestart.sync = sync;

module.exports = prestart;