chore: update rollup and uglify and the build process (#5096)

This is upgrades rollup and uglify to latest versions. It also rewrites the rollup config to take advantage of the newest features of rollup. Minification is also split up into a separate process, mostly to speed up the build. The total build type can go down from about 2.5 minutes to around 1 minute for all the generated javascript files.

build/grunt.js

@@ -82,29 +82,6 @@ module.exports = function(grunt) {
       build: ['build/temp/*', 'es5'],
       dist: ['dist/*']
     },
-    uglify: {
-      options: {
-        preserveComments: 'some',
-        screwIE8: false,
-        mangle: true,
-        compress: {
-          sequences: true,
-          dead_code: true,
-          conditionals: true,
-          booleans: true,
-          unused: true,
-          if_return: true,
-          join_vars: true,
-          drop_console: true
-        }
-      },
-      build: {
-        files: {
-          'build/temp/alt/video.novtt.min.js': 'build/temp/alt/video.novtt.js',
-          'build/temp/video.min.js': 'build/temp/video.js'
-        }
-      }
-    },
     dist: {},
     watch: {
       dist: {
@@ -116,10 +93,6 @@ module.exports = function(grunt) {
         ],
         tasks: ['copy:dist']
       },
-      minify: {
-        files: ['build/temp/video.js'],
-        tasks: ['uglify']
-      },
       skin: {
         files: ['src/css/**/*'],
         tasks: ['skin']
@@ -362,7 +335,7 @@ module.exports = function(grunt) {
         }
       },
       rollupall: {
-        command: 'npm run rollup -- --no-progress && npm run rollup-minify -- --no-progress',
+        command: 'npm run rollup -- --no-progress && npm run minify',
         options: {
           preferLocal: true
         }

build/minify.js

@@ -0,0 +1,46 @@
+import fs from 'fs';
+import uglify from 'uglify-js';
+import maxmin from 'maxmin';
+
+const options = {
+  nameCache: {},
+  output: {
+    comments: 'some'
+  },
+  mangle: true,
+  compress: {
+    sequences: true,
+    dead_code: true,
+    conditionals: true,
+    booleans: true,
+    unused: true,
+    if_return: true,
+    join_vars: true,
+    drop_console: true,
+    typeofs: false
+  }
+};
+
+const minify = (file, dest) => {
+  const code = fs.readFileSync(file, 'utf8');
+  const minified = uglify.minify(code, options);
+
+  if (minified.error) {
+    console.error(minified.error);
+    return;
+  }
+
+  if (minified.warnings) {
+    console.warn(minified.warnings);
+  }
+
+  fs.writeFileSync(dest, minified.code, 'utf8');
+  console.log('File', dest, 'created:', maxmin(code, minified.code, true));
+};
+
+console.log('Minifying files\n'); 
+
+minify('dist/video.js', 'dist/video.min.js');
+minify('dist/alt/video.novtt.js', 'dist/alt/video.novtt.min.js');
+minify('dist/alt/video.core.js', 'dist/alt/video.core.min.js');
+minify('dist/alt/video.core.novtt.js', 'dist/alt/video.core.novtt.min.js');