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frontend/node_modules/underscore/modules/allKeys.js

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+import isObject from './isObject.js';
+import { hasEnumBug } from './_setup.js';
+import collectNonEnumProps from './_collectNonEnumProps.js';
+
+// Retrieve all the enumerable property names of an object.
+export default function allKeys(obj) {
+  if (!isObject(obj)) return [];
+  var keys = [];
+  for (var key in obj) keys.push(key);
+  // Ahem, IE < 9.
+  if (hasEnumBug) collectNonEnumProps(obj, keys);
+  return keys;
+}