flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/assets/LESSAsset.js

@@ -0,0 +1,83 @@
+'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 Asset = require('../Asset');
+const localRequire = require('../utils/localRequire');
+const promisify = require('../utils/promisify');
+
+class LESSAsset extends Asset {
+  constructor(name, pkg, options) {
+    super(name, pkg, options);
+    this.type = 'css';
+  }
+
+  parse(code) {
+    var _this = this;
+
+    return _asyncToGenerator(function* () {
+      // less should be installed locally in the module that's being required
+      let less = yield localRequire('less', _this.name);
+      let render = promisify(less.render.bind(less));
+
+      let opts = Object.assign({}, _this.package.less || (yield _this.getConfig(['.lessrc', '.lessrc.js'])));
+      opts.filename = _this.name;
+      opts.plugins = (opts.plugins || []).concat(urlPlugin(_this));
+
+      return yield render(code, opts);
+    })();
+  }
+
+  collectDependencies() {
+    var _iteratorNormalCompletion = true;
+    var _didIteratorError = false;
+    var _iteratorError = undefined;
+
+    try {
+      for (var _iterator = this.ast.imports[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+        let dep = _step.value;
+
+        this.addDependency(dep, { includedInParent: true });
+      }
+    } catch (err) {
+      _didIteratorError = true;
+      _iteratorError = err;
+    } finally {
+      try {
+        if (!_iteratorNormalCompletion && _iterator.return) {
+          _iterator.return();
+        }
+      } finally {
+        if (_didIteratorError) {
+          throw _iteratorError;
+        }
+      }
+    }
+  }
+
+  generate() {
+    return [{
+      type: 'css',
+      value: this.ast ? this.ast.css : '',
+      hasDependencies: false
+    }];
+  }
+}
+
+function urlPlugin(asset) {
+  return {
+    install: (less, pluginManager) => {
+      let visitor = new less.visitors.Visitor({
+        visitUrl: node => {
+          node.value.value = asset.addURLDependency(node.value.value, node.currentFileInfo.filename);
+          return node;
+        }
+      });
+
+      visitor.run = visitor.visit;
+      pluginManager.addVisitor(visitor);
+    }
+  };
+}
+
+module.exports = LESSAsset;