feat(std/node/stream): Add Duplex, Transform, Passthrough, pipeline, finished and promises (#7940)

1 files changed, 97 insertions, 0 deletions

diff --git a/std/node/_stream/end_of_stream_test.ts b/std/node/_stream/end_of_stream_test.ts
new file mode 100644
index 000000000..571e75b99
--- /dev/null
+++ b/std/node/_stream/end_of_stream_test.ts
@@ -0,0 +1,97 @@
+// Copyright Node.js contributors. All rights reserved. MIT License.
+import finished from "./end_of_stream.ts";
+import Readable from "./readable.ts";
+import Transform from "./transform.ts";
+import Writable from "./writable.ts";
+import { mustCall } from "../_utils.ts";
+import { assert, fail } from "../../testing/asserts.ts";
+import { deferred, delay } from "../../async/mod.ts";
+
+Deno.test("Finished appends to Readable correctly", async () => {
+  const rs = new Readable({
+    read() {},
+  });
+
+  const [finishedExecution, finishedCb] = mustCall((err) => {
+    assert(!err);
+  });
+
+  finished(rs, finishedCb);
+
+  rs.push(null);
+  rs.resume();
+
+  await finishedExecution;
+});
+
+Deno.test("Finished appends to Writable correctly", async () => {
+  const ws = new Writable({
+    write(_data, _enc, cb) {
+      cb();
+    },
+  });
+
+  const [finishedExecution, finishedCb] = mustCall((err) => {
+    assert(!err);
+  });
+
+  finished(ws, finishedCb);
+
+  ws.end();
+
+  await finishedExecution;
+});
+
+Deno.test("Finished appends to Transform correctly", async () => {
+  const tr = new Transform({
+    transform(_data, _enc, cb) {
+      cb();
+    },
+  });
+
+  let finish = false;
+  let ended = false;
+
+  tr.on("end", () => {
+    ended = true;
+  });
+
+  tr.on("finish", () => {
+    finish = true;
+  });
+
+  const [finishedExecution, finishedCb] = mustCall((err) => {
+    assert(!err);
+    assert(finish);
+    assert(ended);
+  });
+
+  finished(tr, finishedCb);
+
+  tr.end();
+  tr.resume();
+
+  await finishedExecution;
+});
+
+Deno.test("The function returned by Finished clears the listeners", async () => {
+  const finishedExecution = deferred();
+
+  const ws = new Writable({
+    write(_data, _env, cb) {
+      cb();
+    },
+  });
+
+  const removeListener = finished(ws, () => {
+    finishedExecution.reject();
+  });
+  removeListener();
+  ws.end();
+
+  await Promise.race([
+    delay(100),
+    finishedExecution,
+  ])
+    .catch(() => fail("Finished was executed"));
+});