Function visitMappedType

test/fixtures/snapshot/typescript.js:47876–47881

(type)

                visitType(type.constraint);
            }
            function visitMappedType(type) {
                visitType(type.typeParameter);
                visitType(type.constraintType);
                visitType(type.templateType);
                visitType(type.modifiersType);
            }
            function visitSignature(signature) {
                var typePredicate = getTypePredicateOfSignature(signature);
                if (typePredicate) {