Workflow SDK now supports inflight cancellation

Short summary

Vercel's Workflow SDK 5 beta now supports AbortController and AbortSignal APIs for canceling in-flight operations across workflow and step boundaries. Cancellation is durable and survives deterministic replay. Use cases include stopping slow steps on timeout, canceling remaining requests after first success, or canceling parallel work on external conditions.

• •AbortController/AbortSignal support added to Workflow SDK 5 beta
• •Cancellation is durable across suspensions and deterministic replay
• •Use cases: race conditions, request deduplication, conditional cancellation of parallel work

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