flow like the river

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

@@ -0,0 +1,37 @@
+'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 path = require('path');
+const Packager = require('./Packager');
+const SourceMap = require('../SourceMap');
+
+class SourceMapPackager extends Packager {
+  start() {
+    var _this = this;
+
+    return _asyncToGenerator(function* () {
+      _this.sourceMap = new SourceMap();
+    })();
+  }
+
+  addAsset(asset) {
+    var _this2 = this;
+
+    return _asyncToGenerator(function* () {
+      yield _this2.sourceMap.addMap(asset.generated.map, _this2.bundle.parentBundle.getOffset(asset));
+    })();
+  }
+
+  end() {
+    var _this3 = this;
+
+    return _asyncToGenerator(function* () {
+      let file = path.basename(_this3.bundle.name);
+      yield _this3.write(_this3.sourceMap.stringify(file, path.relative(_this3.options.outDir, _this3.options.rootDir)));
+      yield Packager.prototype.end.call(_this3);
+    })();
+  }
+}
+
+module.exports = SourceMapPackager;