MARKLESS_REPEAT_KEY_UNSTABLE
@for key must identify the item stably: 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_REPEAT_KEY_UNSTABLE: key <keySource> does not derive identity from <itemName> or an explicit index alias. Row state, event wiring, and DOM reuse follow the key, so rows of <collectionSource> could not be matched with themselves reliably.
The key is the stable identity root for a repeated graph scope across reorder, insert, delete, and resume; a value that is not derived from the item or its position cannot identify anything.
Key by a stable field of <itemName>, such as `key <itemName>.id`, or key by position with `index i; key i` when state should follow the slot.
https://markless.dev/errors/MARKLESS_REPEAT_KEY_UNSTABLEWords in angle brackets change from case to case.
How to fix it
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Where it comes from
@markless/compiler raises this code. Source:
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