build.js

/**
 * Wrapper for running webpack
 */
const webpack = require('webpack');
const path = require('path');
const fs = require('fs-extra');

const log = require('debug')('build:process');
const logError = require('debug')('build:error');
const logSuccessError = require('debug')('build:success:error');
const logSuccessWarning = require('debug')('build:success:warning');

logError.color = 1;
logSuccessError.color = 5;
logSuccessWarning.color = 3;

function build() {
  const config = require('./webpack.config.js');

  // Make sure build path is exist, if not create it
  log(`> Cleaning output folder ${config.output.path} ...`);
  fs.emptyDirSync(config.output.path);

  return new Promise((resolve, reject) => {
    webpack(config).run((err, stats) => {
      if (err) {
        logError(err.stack || err);

        if (err.details) {
          logError(err.details);
        }

        reject(err);
      } else {
        const info = stats.toJson();

        if (stats.hasErrors()) {
          logSuccessError(info.errors);

          process.exit(1);
        }

        if (stats.hasWarnings()) {
          logSuccessWarning(info.warnings);
        }

        resolve();
      }
    });
  });
}

build();