ExpressionDataActionType

An enum that represents the type of the [expression
data action](https://developers.google.com/apps-script/reference/card-service/expression-data-action).

Only available through the [Gemini
Alpha program](https://support.google.com/a/answer/14170809) for Google Workspace add-ons that extend Google Workspace Flows.

```javascript
const expressionDataAction = CardService.newExpressionDataAction()
.setActionType(CardService.ExpressionDataActionType.START_EXPRESSION_EVALUATION);
```

### Properties

| Property | Type | Description |
|---|---|---|
| `ACTION_TYPE_UNSPECIFIED` | `Enum` | The unspecified action type. |
| `START_EXPRESSION_EVALUATION` | `Enum` | The action to start the [CEL expression validation](https://developers.google.com/workspace/add-ons/studio/validate-inputs#cel-validation). |