fix: prevent DataCloneError in postMessage serialization#152
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fix: prevent DataCloneError in postMessage serialization#152vapi-tasker[bot] wants to merge 1 commit intomainfrom
vapi-tasker[bot] wants to merge 1 commit intomainfrom
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…rack objects When users pass MediaStreamTrack objects as audioSource or videoSource, these were being included directly in call-start-progress event metadata. MediaStreamTrack objects cannot be cloned by the structured clone algorithm used by postMessage, causing DataCloneError during Daily call join. This fix: - Adds describeMediaSource() to convert MediaStreamTrack to serializable strings - Adds sanitizeForPostMessage() for general non-cloneable value handling - Updates call-start-progress events to use describeMediaSource() for metadata - Adds comprehensive tests for serialization utilities Fixes DEVREL-464 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
describeMediaSource()helper to convert MediaStreamTrack objects to serializable string descriptionssanitizeForPostMessage()utility for general non-cloneable value handling (functions, symbols, circular refs)Problem
When a customer passes a custom MediaStreamTrack as
audioSourceorvideoSourceto the Vapi SDK, the SDK includes these objects directly in thecall-start-progressevent metadata. MediaStreamTrack objects cannot be cloned by the structured clone algorithm used bypostMessage, causing aDataCloneErrorduring Daily call join:Solution
Convert non-serializable values (MediaStreamTrack, functions, symbols, etc.) to descriptive strings before including them in event metadata. The actual MediaStreamTrack is still passed to Daily's
createCallObject()- only the diagnostic metadata is sanitized.Test plan
describeMediaSource()functionsanitizeForPostMessage()functionFixes DEVREL-464
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