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node_modules/graphql/polyfills/flatMap.js.flow

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+// @flow strict
+
+declare function flatMap<T, U>(
+  list: $ReadOnlyArray<T>,
+  fn: (item: T, index: number) => $ReadOnlyArray<U> | U,
+): Array<U>;
+
+// Workaround to make older Flow versions happy
+const flatMapMethod = (Array.prototype: any).flatMap;
+
+/* eslint-disable no-redeclare */
+// $FlowFixMe
+const flatMap = flatMapMethod
+  ? function(list, fn) {
+      return flatMapMethod.call(list, fn);
+    }
+  : function(list, fn) {
+      let result = [];
+      for (const item of list) {
+        const value = fn(item);
+        if (Array.isArray(value)) {
+          result = result.concat(value);
+        } else {
+          result.push(value);
+        }
+      }
+      return result;
+    };
+export default flatMap;