function nullimport { null } from "https://deno.land/x/valibot@v0.39.0/src/schemas/null/null.ts"; null(message?: ErrorMessage<NullIssue>): NullSchema<ErrorMessage<NullIssue> | undefined>Parametersoptionalmessage: ErrorMessage<NullIssue>ReturnsNullSchema<ErrorMessage<NullIssue> | undefined>