nl_tokens: Abstract operations implementing interface required by the WritableStream .
pl_tokens: function WritableStreamDefaultControllerAbort ( <mask> , reason ) { controller . _queue = [ ] ; const sinkAbortPromise = PromiseInvokeOrFallbackOrNoop ( controller . _underlyingSink , 'abort' , [ reason ] , 'close' , [ controller ] ) ; return sinkAbortPromise . then ( ( ) => undefined ) ; }