@check — Boundary Documentation

The @check attribute in BAML adds validations without raising exceptions if they fail. This allows the validations to be inspected at runtime.

Usage

BAML

1 class Foo {
2   bar int @check(less_than_zero, {{ this < 0 }})
3 }

1 class Bar {
2   baz int
3   quux string
4   @@check(quux_limit, {{ this.quux|length < this.baz }})
5 }

Non-Intrusive Validation: Allows for validation checks without interrupting the flow of data processing.
Runtime Inspection: Enables inspection of validation results at runtime.

1	class Foo {
2	bar int @check(less_than_zero, {{ this < 0 }})
3	}

1	class Bar {
2	baz int
3	quux string
4	@@check(quux_limit, {{ this.quux\|length < this.baz }})
5	}