Move compression from Webpack to Gulp (#4074)

build-scripts/gulp/compress.js

@@ -0,0 +1,31 @@
+// Tasks to compress
+
+const gulp = require("gulp");
+const zopfli = require("gulp-zopfli-green");
+const merge = require("merge-stream");
+const path = require("path");
+const paths = require("../paths");
+
+gulp.task("compress-app", function compressApp() {
+  const jsLatest = gulp
+    .src(path.resolve(paths.output, "**/*.js"))
+    .pipe(zopfli())
+    .pipe(gulp.dest(paths.output));
+
+  const jsEs5 = gulp
+    .src(path.resolve(paths.output_es5, "**/*.js"))
+    .pipe(zopfli())
+    .pipe(gulp.dest(paths.output_es5));
+
+  const polyfills = gulp
+    .src(path.resolve(paths.static, "polyfills/*.js"))
+    .pipe(zopfli())
+    .pipe(gulp.dest(path.resolve(paths.static, "polyfills")));
+
+  const translations = gulp
+    .src(path.resolve(paths.static, "translations/*.json"))
+    .pipe(zopfli())
+    .pipe(gulp.dest(path.resolve(paths.static, "translations")));
+
+  return merge(jsLatest, jsEs5, polyfills, translations);
+});