WIP - add extractor, generate snippet_data

node_modules/fbjs/lib/getByPath.js.flow

@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule getByPath
+ * @flow
+ * @typechecks
+ */
+'use strict';
+/**
+ * Get a value from an object based on the given path
+ *
+ * Usage example:
+ *
+ *   var obj = {
+ *     a : {
+ *       b : 123
+ *     }
+ *   };
+ *
+ * var result = getByPath(obj, ['a', 'b']); // 123
+ *
+ * You may also specify the path using an object with a path field
+ *
+ * var result = getByPath(obj, {path: ['a', 'b']}); // 123
+ *
+ * If the path doesn't exist undefined will be returned
+ *
+ * var result = getByPath(obj, ['x', 'y', 'z']); // undefined
+ */
+
+function getByPath(root
+/*?Object | Error*/
+: any, path: Array<string>, fallbackValue?: any): any {
+  let current = root;
+
+  for (let i = 0; i < path.length; i++) {
+    const segment = path[i]; // Use 'in' to check entire prototype chain since immutable js records
+    // use prototypes
+
+    if (current && segment in current) {
+      current = current[segment];
+    } else {
+      return fallbackValue;
+    }
+  }
+
+  return current;
+}
+
+module.exports = getByPath;