flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/packagers/CSSPackager.js

@@ -0,0 +1,59 @@
+'use strict';
+
+function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }
+
+const Packager = require('./Packager');
+
+class CSSPackager extends Packager {
+  addAsset(asset) {
+    var _this = this;
+
+    return _asyncToGenerator(function* () {
+      let css = asset.generated.css || '';
+
+      // Figure out which media types this asset was imported with.
+      // We only want to import the asset once, so group them all together.
+      let media = [];
+      var _iteratorNormalCompletion = true;
+      var _didIteratorError = false;
+      var _iteratorError = undefined;
+
+      try {
+        for (var _iterator = asset.parentDeps[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+          let dep = _step.value;
+
+          if (!dep.media) {
+            // Asset was imported without a media type. Don't wrap in @media.
+            media.length = 0;
+            break;
+          } else {
+            media.push(dep.media);
+          }
+        }
+
+        // If any, wrap in an @media block
+      } catch (err) {
+        _didIteratorError = true;
+        _iteratorError = err;
+      } finally {
+        try {
+          if (!_iteratorNormalCompletion && _iterator.return) {
+            _iterator.return();
+          }
+        } finally {
+          if (_didIteratorError) {
+            throw _iteratorError;
+          }
+        }
+      }
+
+      if (media.length) {
+        css = `@media ${media.join(', ')} {\n${css.trim()}\n}\n`;
+      }
+
+      yield _this.write(css);
+    })();
+  }
+}
+
+module.exports = CSSPackager;