flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/transforms/uglify.js

@@ -0,0 +1,76 @@
+'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"); }); }; }
+
+var _require = require('uglify-es');
+
+const minify = _require.minify;
+
+const SourceMap = require('../SourceMap');
+
+module.exports = (() => {
+  var _ref = _asyncToGenerator(function* (asset) {
+    yield asset.parseIfNeeded();
+
+    // Convert AST into JS
+    let source = (yield asset.generate()).js;
+
+    let customConfig = yield asset.getConfig(['.uglifyrc']);
+    let options = {
+      warnings: true,
+      mangle: {
+        toplevel: true
+      }
+    };
+
+    let sourceMap;
+    if (asset.options.sourceMap) {
+      sourceMap = new SourceMap();
+      options.output = {
+        source_map: {
+          add(source, gen_line, gen_col, orig_line, orig_col, name) {
+            sourceMap.addMapping({
+              source,
+              name,
+              original: {
+                line: orig_line,
+                column: orig_col
+              },
+              generated: {
+                line: gen_line,
+                column: gen_col
+              }
+            });
+          }
+        }
+      };
+    }
+
+    if (customConfig) {
+      options = Object.assign(options, customConfig);
+    }
+
+    let result = minify(source, options);
+
+    if (result.error) {
+      throw result.error;
+    }
+
+    if (sourceMap) {
+      if (asset.sourceMap) {
+        asset.sourceMap = yield new SourceMap().extendSourceMap(asset.sourceMap, sourceMap);
+      } else {
+        asset.sourceMap = sourceMap;
+      }
+    }
+
+    // babel-generator did our code generation for us, so remove the old AST
+    asset.ast = null;
+    asset.outputCode = result.code;
+    asset.isAstDirty = false;
+  });
+
+  return function (_x) {
+    return _ref.apply(this, arguments);
+  };
+})();