merge new into master

node_modules/hermes-parser/dist/traverse/getVisitorKeys.js.flow

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ * @noformat
+ */
+
+'use strict';
+
+import type {ESNode} from 'hermes-estree';
+import type {VisitorKeys as VisitorKeysType} from '../generated/ESTreeVisitorKeys';
+
+import FlowVisitorKeys from '../generated/ESTreeVisitorKeys';
+
+export function isNode(thing: mixed) /*: implies thing is {+[string]: mixed} */ {
+  return (
+    typeof thing === 'object' && thing != null && typeof thing.type === 'string'
+  );
+}
+
+export type {VisitorKeysType};
+export function getVisitorKeys<T: ESNode>(
+  node: T,
+  visitorKeys?: ?VisitorKeysType,
+): $ReadOnlyArray<$Keys<T>> {
+  const keys = (visitorKeys ?? FlowVisitorKeys)[node.type];
+  if (keys == null) {
+    throw new Error(`No visitor keys found for node type "${node.type}".`);
+  }
+
+  // $FlowExpectedError[prop-missing]
+  return keys;
+}