MARKLESS_SYNC_POLICY_UNEXTRACTABLE

Cannot extract synchronous event policy: a Markless compiler error.

Error from the compiler, while it builds your .tsrx files.

What happened

Markless prints the message, the reason, and a suggestion:

MARKLESS_SYNC_POLICY_UNEXTRACTABLE: `<source>` detaches <action> from the event, so the compiler cannot prove when the default action is cancelled for <attributeName>.
preventDefault() and stopPropagation() must run before lazy handler symbols load; a detached reference hides which action runs and under what condition.
Call it directly on the event parameter instead of detaching <action>.
https://markless.dev/errors/MARKLESS_SYNC_POLICY_UNEXTRACTABLE

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How to fix it

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Where it comes from

@markless/compiler raises this code. Source:

• packages/compiler/src/passes/semantic-graph/collect-sync-policy.ts

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