pinafore/webpack/service-worker.config.js

const config = require('sapper/config/webpack.js')
const terser = require('./terser.config')
const webpack = require('webpack')
const { mode, dev, resolve } = require('./shared.config')

module.exports = {
  entry: config.serviceworker.entry(),
  output: config.serviceworker.output(),
  resolve,
  mode,
  devtool: dev ? 'inline-source-map' : 'source-map',
  optimization: dev ? {} : {
    minimize: !process.env.DEBUG,
    minimizer: [
      terser()
    ]
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.browser': true,
      'process.env.NODE_ENV': JSON.stringify(mode),
      'process.env.SAPPER_TIMESTAMP': process.env.SAPPER_TIMESTAMP || Date.now()
    })
  ].filter(Boolean)
}