Function getConstraintTypeFromMappedType

test/fixtures/snapshot/typescript.js:58635–58638

(type)

                (type.typeParameter = getDeclaredTypeOfTypeParameter(getSymbolOfNode(type.declaration.typeParameter)));
        }
        function getConstraintTypeFromMappedType(type) {
            return type.constraintType ||
                (type.constraintType = getConstraintOfTypeParameter(getTypeParameterFromMappedType(type)) || errorType);
        }
        function getNameTypeFromMappedType(type) {
            return type.declaration.nameType ?
                type.nameType || (type.nameType = instantiateType(getTypeFromTypeNode(type.declaration.nameType), type.mapper)) :