1 files changed, 75 insertions, 0 deletions
diff --git a/cli/js/streams/readable-stream-default-reader.ts b/cli/js/streams/readable-stream-default-reader.ts
new file mode 100644
index 000000000..eb1910a9d
--- /dev/null
+++ b/cli/js/streams/readable-stream-default-reader.ts
@@ -0,0 +1,75 @@
+// Forked from https://github.com/stardazed/sd-streams/tree/8928cf04b035fd02fb1340b7eb541c76be37e546
+// Copyright (c) 2018-Present by Arthur Langereis - @zenmumbler MIT
+
+/**
+ * streams/readable-stream-default-reader - ReadableStreamDefaultReader class implementation
+ * Part of Stardazed
+ * (c) 2018-Present by Arthur Langereis - @zenmumbler
+ * https://github.com/stardazed/sd-streams
+ */
+
+import * as rs from "./readable-internals.ts";
+import * as shared from "./shared-internals.ts";
+
+export class ReadableStreamDefaultReader<OutputType>
+  implements rs.SDReadableStreamReader<OutputType> {
+  [rs.closedPromise_]: shared.ControlledPromise<void>;
+  [rs.ownerReadableStream_]: rs.SDReadableStream<OutputType> | undefined;
+  [rs.readRequests_]: Array<rs.ReadRequest<IteratorResult<OutputType>>>;
+
+  constructor(stream: rs.SDReadableStream<OutputType>) {
+    if (!rs.isReadableStream(stream)) {
+      throw new TypeError();
+    }
+    if (rs.isReadableStreamLocked(stream)) {
+      throw new TypeError("The stream is locked.");
+    }
+    rs.readableStreamReaderGenericInitialize(this, stream);
+    this[rs.readRequests_] = [];
+  }
+
+  get closed(): Promise<void> {
+    if (!rs.isReadableStreamDefaultReader(this)) {
+      return Promise.reject(new TypeError());
+    }
+    return this[rs.closedPromise_].promise;
+  }
+
+  cancel(reason: shared.ErrorResult): Promise<void> {
+    if (!rs.isReadableStreamDefaultReader(this)) {
+      return Promise.reject(new TypeError());
+    }
+    const stream = this[rs.ownerReadableStream_];
+    if (stream === undefined) {
+      return Promise.reject(
+        new TypeError("Reader is not associated with a stream")
+      );
+    }
+    return rs.readableStreamCancel(stream, reason);
+  }
+
+  read(): Promise<IteratorResult<OutputType | undefined>> {
+    if (!rs.isReadableStreamDefaultReader(this)) {
+      return Promise.reject(new TypeError());
+    }
+    if (this[rs.ownerReadableStream_] === undefined) {
+      return Promise.reject(
+        new TypeError("Reader is not associated with a stream")
+      );
+    }
+    return rs.readableStreamDefaultReaderRead(this, true);
+  }
+
+  releaseLock(): void {
+    if (!rs.isReadableStreamDefaultReader(this)) {
+      throw new TypeError();
+    }
+    if (this[rs.ownerReadableStream_] === undefined) {
+      return;
+    }
+    if (this[rs.readRequests_].length !== 0) {
+      throw new TypeError("Cannot release a stream with pending read requests");
+    }
+    rs.readableStreamReaderGenericRelease(this);
+  }
+}