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gulpfile.js/private-tasks/bundle--scripts.js

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+const { src, dest } = require('gulp');
+const concat = require('gulp-concat');
+const rename = require('gulp-rename');
+const uglify = require('gulp-uglify');
+
+const { outputScript } = require('../config/directories');
+const { handleError } = require('../utils/errors');
+const { min } = require('../config/rename');
+
+function bundleScripts() {
+  return src([`${outputScript}externals.js`, `${outputScript}*.js`])
+    .pipe(concat('scripts.js'))
+    .on('error', handleError)
+    .pipe(dest(outputScript))
+    .pipe(rename(min))
+    .pipe(uglify({
+      mangle: {
+        keep_fnames: true,
+      },
+    }))
+    .on('error', handleError)
+    .pipe(dest(outputScript));
+}
+
+bundleScripts.displayName = 'bundle:scripts';
+
+module.exports = bundleScripts;