package Ġgraphql . schema . validation Ċ Ċ import Ġgraphql . schema . GraphQL Field Definition Ċ Ċ interface ĠValidation Rule Ġ{ ĊĊĠĠĠ Ġfun Ġcheck ( field Def : ĠGraphQL Field Definition <* >, Ġvalidation Error Collector : ĠValidationError Collector ) Ċ } Ċ