Add transformer.cancel method to TransformStream constructor
#25519
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Summary
The transformer object passed to the
TransformStreamconstructor can now also have acancelmethod, which is called whenever the readable side is cancelled or when the writable side is aborted. See the specification and the spec change for context.Test results and supporting details
This method is not yet supported in any browser. However, server runtimes such as Node.js and Deno already support it: