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‎lib/internal/webstreams/writablestream.js‎
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‎test/parallel/test-whatwg-writablestream.js‎
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@@ -978,10 +978,6 @@ changes:
 The `WritableStreamDefaultController` manage's the {WritableStream}'s
 internal state.
 
-#### `writableStreamDefaultController.abortReason`
-
-* Type: {any} The `reason` value passed to `writableStream.abort()`.
-
 #### `writableStreamDefaultController.error(error)`
 
 <!-- YAML
 
@@ -508,15 +508,6 @@ class WritableStreamDefaultController {
     resetQueue(this);
   }
 
-  /**
-   * @type {any}
-   */
-  get abortReason() {
-    if (!isWritableStreamDefaultController(this))
-      throw new ERR_INVALID_THIS('WritableStreamDefaultController');
-    return this[kState].abortReason;
-  }
-
   /**
    * @type {AbortSignal}
    */
@@ -545,7 +536,6 @@ class WritableStreamDefaultController {
 }
 
 ObjectDefineProperties(WritableStreamDefaultController.prototype, {
-  abortReason: kEnumerableProperty,
   signal: kEnumerableProperty,
   error: kEnumerableProperty,
 });
@@ -637,10 +627,6 @@ function writableStreamAbort(stream, reason) {
   if (state === 'closed' || state === 'errored')
     return PromiseResolve();
 
-  // TODO(daeyeon): Remove `controller[kState].abortReason` and use
-  // `controller[kState].abortController.signal.reason` for the
-  // `WritableStreamDefaultController.prototype.abortReason` getter.
-  controller[kState].abortReason = reason;
   controller[kState].abortController.abort(reason);
 
   if (stream[kState].pendingAbortRequest.abort.promise !== undefined)
@@ -1253,7 +1239,6 @@ function setupWritableStreamDefaultController(
   assert(stream[kState].controller === undefined);
   controller[kState] = {
     abortAlgorithm,
-    abortReason: undefined,
     closeAlgorithm,
     highWaterMark,
     queue: [],
 
@@ -198,12 +198,6 @@ class Sink {
     code: 'ERR_INVALID_THIS',
   });
 
-  assert.throws(() => {
-    Reflect.get(WritableStreamDefaultController.prototype, 'abortReason', {});
-  }, {
-    code: 'ERR_INVALID_THIS',
-  });
-
   assert.throws(() => {
     Reflect.get(WritableStreamDefaultController.prototype, 'signal', {});
   }, {