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Update insert functions - include variable scoping [DOC-1065] #7514

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Apr 16, 2025
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Update insert functions - include variable scoping [DOC-1065] #7514

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Update insert functions - include variable scoping.md
sade-wusi Mar 21, 2025
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6 changes: 6 additions & 0 deletions src/connections/functions/insert-functions.md
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Expand Up @@ -111,6 +111,12 @@ To ensure the Destination processes an event payload modified by the function, r
> info ""
> Functions' runtime includes a `fetch()` polyfill using a `node-fetch` package. Check out the [node-fetch documentation](https://www.npmjs.com/package/node-fetch){:target="_blank"} for usage examples.

### Variable scoping

When declaring settings variables, make sure to declare them in the function handler rather than globally in your function. This prevents you leaking the settings values across other function instances.

The handler for insert functions is event-specific, for example, `onTrack()`, `onIdentify()`, and so on.

### Errors and error handling

Segment considers a function's execution successful if it finishes without error. You can `throw` an error to create a failure on purpose. Use these errors to validate event data before processing it to ensure the function works as expected.
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