This is a testharness.js-based test.
FAIL TransformStream errors thrown in transform put the writable and readable in an errored state Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL TransformStream errors thrown in flush put the writable and readable in an errored state Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL errored TransformStream should not enqueue new chunks Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL TransformStream transformer.start() rejected promise should error the stream Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL when controller.error is followed by a rejection, the error reason should come from controller.error Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL TransformStream constructor should throw when start does assert_throws: constructor should throw function "() => new TransformStream({
    start() { throw new URIError('start thrown error'); },
    transform() {}
  })" threw object "TypeError: Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled" ("TypeError") expected object "URIError" ("URIError")
FAIL when strategy.size throws inside start(), the constructor should throw the same error assert_throws: constructor should throw the same error strategy.size throws function "() => new TransformStream({
    start(c) {
      c.enqueue('a');
    },
    transform() {}
  }, undefined, strategy)" threw object "TypeError: Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled" ("TypeError") expected object "URIError" ("URIError")
FAIL when strategy.size calls controller.error() then throws, the constructor should throw the first error assert_throws: the first error should be thrown function "() => new TransformStream({
    start(c) {
      controller = c;
      c.enqueue('a');
    },
    transform() {}
  }, undefined, strategy)" threw object "TypeError: Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled" ("TypeError") expected object "URIError" ("URIError")
FAIL cancelling the readable side should error the writable Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL it should be possible to error the readable between close requested and complete Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL an exception from transform() should error the stream if terminate has been requested but not completed Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL abort should set the close reason for the writable when it happens before cancel during start, but cancel should still succeed Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL abort should set the close reason for the writable when it happens before cancel during underlying sink write, but cancel should still succeed Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL controller.error() should do nothing the second time it is called Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL controller.error() should do nothing after readable.cancel() Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL controller.error() should do nothing after writable.abort() has completed Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL controller.error() should do nothing after a transformer method has thrown an exception Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL erroring during write with backpressure should result in the write failing Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL a write() that was waiting for backpressure should reject if the writable is aborted Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
FAIL the readable should be errored with the reason passed to the writable abort() method Failed to construct 'TransformStream': TransformStream disabled because StreamsNative is enabled
Harness: the test ran to completion.