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node_modules/vue-lazyload/build.js

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+const fs = require('fs')
+const path = require('path')
+const rollup = require('rollup')
+const babel = require('rollup-plugin-babel')
+const uglify = require('rollup-plugin-uglify')
+const resolve = require('rollup-plugin-node-resolve')
+const commonjs = require('rollup-plugin-commonjs')
+const version = process.env.VERSION || require('./package.json').version
+
+const banner =
+    '/*!\n' +
+    ' * Vue-Lazyload.js v' + version + '\n' +
+    ' * (c) ' + new Date().getFullYear() + ' Awe <hilongjw@gmail.com>\n' +
+    ' * Released under the MIT License.\n' +
+    ' */\n'
+
+async function build () {
+  try {
+    const bundle = await rollup.rollup({
+      input: path.resolve(__dirname, 'src/index.js'),
+      plugins: [
+        resolve(),
+        commonjs(),
+        babel({ runtimeHelpers: true }),
+        uglify()
+      ]
+    })
+
+    let { code } = await bundle.generate({
+      format: 'umd',
+      name: 'VueLazyload'
+    })
+
+    code = rewriteVersion(code)
+
+    await write(path.resolve(__dirname, 'vue-lazyload.js'), code)
+
+    console.log('Vue-Lazyload.js v' + version + ' builded')
+  } catch (e) {
+    console.log(e)
+  }
+}
+
+function rewriteVersion (code) {
+  return code.replace('__VUE_LAZYLOAD_VERSION__', version)
+}
+
+function getSize (code) {
+  return (code.length / 1024).toFixed(2) + 'kb'
+}
+
+function blue (str) {
+  return '\x1b[1m\x1b[34m' + str + '\x1b[39m\x1b[22m'
+}
+
+function write (dest, code) {
+  return new Promise(function (resolve, reject) {
+    code = banner + code
+    fs.writeFile(dest, code, function (err) {
+      if (err) return reject(err)
+      console.log(blue(dest) + ' ' + getSize(code))
+      resolve()
+    })
+  })
+}
+
+build()