Refactoring

src/functions/last.ts

@@ -0,0 +1,13 @@
+/**
+ * Return a Promise resolving to the last streamed chunk of the given readable stream, after it has
+ * ended
+ * @param readable Readable stream to wait on
+ */
+export function last<T>(readable: NodeJS.ReadableStream): Promise<T | null> {
+    let lastChunk: T | null = null;
+    return new Promise((resolve, _) => {
+        readable
+            .on("data", chunk => (lastChunk = chunk))
+            .on("end", () => resolve(lastChunk));
+    });
+}