chore(node): add Readable.from utility

Added in v12.3.0 from PR nodejs/node#27660

types/node/stream.d.ts

@@ -18,6 +18,7 @@ declare module "stream" {
         }
 
         class Readable extends Stream implements NodeJS.ReadableStream {
+            static from(iterable: Iterable<any> | AsyncIterable<any>, opts?: ReadableOptions): NodeJS.ReadableStream;
             readable: boolean;
             readonly readableHighWaterMark: number;
             readonly readableLength: number;

types/node/ts3.2/stream.ts

@@ -0,0 +1,22 @@
+import { Readable } from "stream";
+import { ok as assert } from 'assert';
+
+async function readable_from() {
+    const list = [ 1, 2, 3 ];
+    const listPromise = list.map(n => Promise.resolve(n)));
+
+    const readableSync = Readable.from(list);
+    const readableAsync = Readable.from(listPromise);
+
+    let i = 0;
+
+    for await (const n of readableSync) {
+        assert(n === list[i++]);
+    }
+
+    i = 0;
+
+    for await (const n of readableAsync) {
+        assert(n === list[i++]);
+    }
+}