`Failed to evaluate expression` warning when using mouse events
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- Dominant language
- TypeScript
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Description
**mapbox-gl-js version**: 3.7.0
**browser**: Chrome 130.0.6723.92 (64-bit)
### Steps to Trigger Behavior
1. Define a symbol layer with `text-field` combining `at` and `get` operators
2. Add a mouse event listener for the applicable layer
3. Hover a point in the applicable layer
4. Observe that a console warning is emitted
### Link to Demonstration
https://jsfiddle.net/pkhalle/9o18f52s/
### Expected Behavior
No console warning is emitted.
### Actual Behavior
The following console warning is emitted:
```
Failed to evaluate expression "["format",["get","value",["at",0,["array",["get","texts"]]]],{}]". The expression ["get","texts"] evaluated to string but was expected to be of type array.
```
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked JSFiddle and reproduce the warning using a symbol layer whose text-field combines at and get, then trace the mouse event listener path and expression evaluation. Done means hovering the applicable layer no longer emits the type-mismatch warning while the text expression still evaluates correctly.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- frontend, web-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100