Use decorators directly on functions

[flycran]

The existing decorators can only be applied to classes. Sometimes it is unnecessary to define a class for this purpose. Refer to the relevant syntax of Python. I think if you can directly define decorators for functions, you can save a lot of unnecessary code, especially you don't need to define a separate class for this purpose.

function logger(target: any, propertyKey: string, descriptor: PropertyDescriptor) {
  //...
}

@logger
function fuc() {
  //...
}

[MartinJohns]

You forgot to fill out the issue template. Duplicate of #7318, this is something not supported by JavaScript.