example methodDecorator typescript

exampleMethodDecorator.ts

// use like this
/*
@ExampleMethodDecorator({
    // whatever....
    foo: 2,
    bar: 'foobar',
})
*/

export function ExampleMethodDecorator(configuration?: any): MethodDecorator {
    return (target: any, propertyKey: string, descriptor: PropertyDescriptor) => {
        const originalMethod = descriptor.value;

        return {
            get(this): any {
                descriptor.value = (...args: any[]) => {
                    // args are the arguments supplied to the originalMethod
                    if (configuration) {
                        // configuration is the object supplied to the decorator
                        console.log(configuration)
                    }
                    const aNumber = Number(window.prompt("Type a number", ""));
                    if (aNumber) {
                        return originalMethod.apply(this, {...args, number: aNumber})
                    } else {
                        return;
                    }
                };
                // tslint:disable-next-line:no-non-null-assertion
                return descriptor.value!.bind(this);
            }
        };
    };
};