Function getModifiersTypeFromMappedType

test/fixtures/snapshot/typescript.js:58658–58677

(type)

                constraintDeclaration.operator === 140 /* SyntaxKind.KeyOfKeyword */;
        }
        function getModifiersTypeFromMappedType(type) {
            if (!type.modifiersType) {
                if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
                    // If the constraint declaration is a 'keyof T' node, the modifiers type is T. We check
                    // AST nodes here because, when T is a non-generic type, the logic below eagerly resolves
                    // 'keyof T' to a literal union type and we can't recover T from that type.
                    type.modifiersType = instantiateType(getTypeFromTypeNode(getConstraintDeclarationForMappedType(type).type), type.mapper);
                }
                else {
                    // Otherwise, get the declared constraint type, and if the constraint type is a type parameter,
                    // get the constraint of that type parameter. If the resulting type is an indexed type 'keyof T',
                    // the modifiers type is T. Otherwise, the modifiers type is unknown.
                    var declaredType = getTypeFromMappedTypeNode(type.declaration);
                    var constraint = getConstraintTypeFromMappedType(declaredType);
                    var extendedConstraint = constraint && constraint.flags & 262144 /* TypeFlags.TypeParameter */ ? getConstraintOfTypeParameter(constraint) : constraint;
                    type.modifiersType = extendedConstraint && extendedConstraint.flags & 4194304 /* TypeFlags.Index */ ? instantiateType(extendedConstraint.type, type.mapper) : unknownType;
                }
            }
            return type.modifiersType;
        }
        function getMappedTypeModifiers(type) {
            var declaration = type.declaration;
            return (declaration.readonlyToken ? declaration.readonlyToken.kind === 40 /* SyntaxKind.MinusToken */ ? 2 /* MappedTypeModifiers.ExcludeReadonly */ : 1 /* MappedTypeModifiers.IncludeReadonly */ : 0) |