flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/visitors/env.js

@@ -0,0 +1,30 @@
+'use strict';
+
+const types = require('babel-types');
+const matchesPattern = require('./matches-pattern');
+
+module.exports = {
+  MemberExpression(node, asset) {
+    // Inline environment variables accessed on process.env
+    if (matchesPattern(node.object, 'process.env')) {
+      let key = types.toComputedKey(node);
+      if (types.isStringLiteral(key)) {
+        let val = types.valueToNode(process.env[key.value]);
+        morph(node, val);
+        asset.isAstDirty = true;
+        asset.cacheData.env[key.value] = process.env[key.value];
+      }
+    }
+  }
+};
+
+// replace object properties
+function morph(object, newProperties) {
+  for (let key in object) {
+    delete object[key];
+  }
+
+  for (let key in newProperties) {
+    object[key] = newProperties[key];
+  }
+}