1 files changed, 104 insertions, 0 deletions
diff --git a/src/js/builtins/WritableStreamDefaultWriter.ts b/src/js/builtins/WritableStreamDefaultWriter.ts
new file mode 100644
index 000000000..795b43892
--- /dev/null
+++ b/src/js/builtins/WritableStreamDefaultWriter.ts
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2020 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+export function initializeWritableStreamDefaultWriter(stream) {
+  // stream can be a WritableStream if WritableStreamDefaultWriter constructor is called directly from JS
+  // or an InternalWritableStream in other code paths.
+  const internalStream = $getInternalWritableStream(stream);
+  if (internalStream) stream = internalStream;
+
+  if (!$isWritableStream(stream)) $throwTypeError("WritableStreamDefaultWriter constructor takes a WritableStream");
+
+  $setUpWritableStreamDefaultWriter(this, stream);
+  return this;
+}
+
+$getter;
+export function closed() {
+  if (!$isWritableStreamDefaultWriter(this))
+    return Promise.$reject($makeGetterTypeError("WritableStreamDefaultWriter", "closed"));
+
+  return $getByIdDirectPrivate(this, "closedPromise").$promise;
+}
+
+$getter;
+export function desiredSize() {
+  if (!$isWritableStreamDefaultWriter(this)) throw $makeThisTypeError("WritableStreamDefaultWriter", "desiredSize");
+
+  if ($getByIdDirectPrivate(this, "stream") === undefined) $throwTypeError("WritableStreamDefaultWriter has no stream");
+
+  return $writableStreamDefaultWriterGetDesiredSize(this);
+}
+
+$getter;
+export function ready() {
+  if (!$isWritableStreamDefaultWriter(this))
+    return Promise.$reject($makeThisTypeError("WritableStreamDefaultWriter", "ready"));
+
+  return $getByIdDirectPrivate(this, "readyPromise").$promise;
+}
+
+export function abort(reason) {
+  if (!$isWritableStreamDefaultWriter(this))
+    return Promise.$reject($makeThisTypeError("WritableStreamDefaultWriter", "abort"));
+
+  if ($getByIdDirectPrivate(this, "stream") === undefined)
+    return Promise.$reject($makeTypeError("WritableStreamDefaultWriter has no stream"));
+
+  return $writableStreamDefaultWriterAbort(this, reason);
+}
+
+export function close() {
+  if (!$isWritableStreamDefaultWriter(this))
+    return Promise.$reject($makeThisTypeError("WritableStreamDefaultWriter", "close"));
+
+  const stream = $getByIdDirectPrivate(this, "stream");
+  if (stream === undefined) return Promise.$reject($makeTypeError("WritableStreamDefaultWriter has no stream"));
+
+  if ($writableStreamCloseQueuedOrInFlight(stream))
+    return Promise.$reject($makeTypeError("WritableStreamDefaultWriter is being closed"));
+
+  return $writableStreamDefaultWriterClose(this);
+}
+
+export function releaseLock() {
+  if (!$isWritableStreamDefaultWriter(this)) throw $makeThisTypeError("WritableStreamDefaultWriter", "releaseLock");
+
+  const stream = $getByIdDirectPrivate(this, "stream");
+  if (stream === undefined) return;
+
+  $assert($getByIdDirectPrivate(stream, "writer") !== undefined);
+  $writableStreamDefaultWriterRelease(this);
+}
+
+export function write(chunk) {
+  if (!$isWritableStreamDefaultWriter(this))
+    return Promise.$reject($makeThisTypeError("WritableStreamDefaultWriter", "write"));
+
+  if ($getByIdDirectPrivate(this, "stream") === undefined)
+    return Promise.$reject($makeTypeError("WritableStreamDefaultWriter has no stream"));
+
+  return $writableStreamDefaultWriterWrite(this, chunk);
+}