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Add "Function prototype methods" section to Actions guide #12236

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Add "Function prototype methods" section to Actions guide #12236

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6 changes: 6 additions & 0 deletions src/content/docs/en/guides/actions.mdx
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Expand Up @@ -163,6 +163,12 @@ Now, all of your user actions are callable from the `actions.user` object:
- `actions.user.createUser()`


## Function prototype methods

Action functions only support a limited set of JavaScript function prototype methods: `.toString()`, `.valueOf()`, and `.bind()`.
Methods like `.apply()` and `.call()` are not available. This allows you to safely name actions `apply` or `call` without conflicts.


## Handling returned data

Actions return an object containing either `data` with the type-safe return value of your `handler()`, or an `error` with any backend errors. Errors may come from validation errors on the `input` property or thrown errors within the `handler()`.
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