fix: Prevent Partytown cross-origin errors in iframe environments #3155
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mmartinsoliv
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gvc
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Dec 16, 2025
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Hey @mmartinsoliv! Quick check: I can only see changes in ThirdPartyScripts.tsx in the diff. Are the other updates mentioned in “Changes Made” already covered elsewhere or were they reverted? |
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Hi @lemagnetic! I updated the readme file. The only adjustment is adding a conditional statement. |
hellofanny
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lemagnetic
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What's the problem this PR addresses?
When FastStore is loaded inside an iframe (such as VTEX
Preview), Partytown throws a SecurityError: Failed to read a
named property 'dispatchEvent' from 'Window' due to
cross-origin restrictions. This prevents the preview from
working correctly.
Changes Made:
Partytown only on client-side