extend-enum.ts

function extendEnum(classType: any, enumType: any): void {
    for (let key in enumType) {
        classType[key] = enumType[key];
    }
}

enum EnumType {
    OPTION_A,
    OPTION_B,
}

class ClassType {
    static operation(): void {
        console.log('Do some operation');
    }
}

extendEnum(ClassType, EnumType);

type Result = EnumType;
const Result: (typeof ClassType)&(typeof EnumType) = ClassType as any;

function useResult(result: Result) {
    console.log(Result[result]);
}

Result.operation();
useResult(Result.OPTION_A);