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T4009: Unknown slot ​

Cause ​

Content goes to a slot the component does not declare, or the component has no default slot.

Example ​

xml
<contract>
{ "name": "Card", "role": "group", "parts": ["root"] }
</contract>
<template><div class="root"><Button><span slot="nope">x</span></Button></div></template>

What you see ​

text
ERROR  T4009  app/components/Card.tess:4:49
  Button has no slot "nope".
  Declared slots: "default", "icon".
  Run `tessera explain T4009` for details.

Fix ​

Use a declared slot, or add the slot to the component's contract.

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