Typescript @deprecated annotation

deprecated.ts

class Dog {
    @deprecated('Dogs don\'t roar, they talk.')
    roar() {
        console.log('RRRRR');
    }

    @deprecated()
    smile() {
        console.log('smile');
    }

    walk() {
        console.log('walk');
    }
}

function deprecated(message: string = 'Function {name} is deprecated.') {
    return (instance, name, descriptor) => {
        var original = descriptor.value;
        var localMessage = message.replace('{name}', name);

        descriptor.value = function() {
            console.warn(localMessage);

            return original.apply(instance, arguments);
        };

        return descriptor;
    };
}

// create my dog
var d = new Dog();

d.roar();
d.smile();
d.walk();

Another issue, the line 25 uses instance which will cause this issue. Change it to this will be OK:

export default function deprecated(message: string = 'Function {name} is deprecated.') {
  return (instance: any, name: string, descriptor: any) => {
    console.log('ins for ', name, ' = ', instance);
    let original = descriptor.value;
    let localMessage = message.replace('{name}', name);

    descriptor.value = function() {
      console.warn(localMessage);

      // Use `this` instead of `instance`:
      return original.apply(this, arguments);
    };

    return descriptor;
  };
}