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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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+// @flow strict
+import type { PromiseOrValue } from './PromiseOrValue';
+
+import isPromise from './isPromise';
+
+/**
+ * Similar to Array.prototype.reduce(), however the reducing callback may return
+ * a Promise, in which case reduction will continue after each promise resolves.
+ *
+ * If the callback does not return a Promise, then this function will also not
+ * return a Promise.
+ */
+export default function promiseReduce<T, U>(
+ values: $ReadOnlyArray<T>,
+ callback: (U, T) => PromiseOrValue<U>,
+ initialValue: PromiseOrValue<U>,
+): PromiseOrValue<U> {
+ return values.reduce(
+ (previous, value) =>
+ isPromise(previous)
+ ? previous.then((resolved) => callback(resolved, value))
+ : callback(previous, value),
+ initialValue,
+ );
+}