API reference > @kontsedal/olas-core > mustBeTrue
mustBeTrue() function
Reject any value that isn't boolean true — the "you must check this box" rule for consent / terms-of-service / confirm checkboxes. Unlike required (which now accepts false as a valid boolean), this fails on false.
Signature:
typescript
mustBeTrue: (message?: string) => Validator<boolean>Parameters
Parameter | Type | Description |
|---|---|---|
message | string | (Optional) |
Returns:
Validator<boolean>