Could an enum type be passed as a parameter to a decorator function?
export class A {
@AsEnum(SomeEnum)
name: string;
}
export enum SomeEnum { A, B, C}
export function AsEnum(type): any {
return (target, propert) => {
return {
get: function(): Object {
return type; // the value of type remains undefined
},
}
};
}
The value of 'type' is consistently undefined in this scenario.
It seems that the issue lies in the order of your code.
If you adjust it to:
console.log("the enum: ", MyEnum);
export enum MyEnum { X, Y, Z}
You will receive:
the enum: undefined
To resolve this, ensure that you declare MyEnum before referencing it within the decorator like so:
function EnumDecorator(type): any {
return (target, propert) => {
return {
get: function(): Object {
return type; // type is undefined
},
}
};
}
enum MyEnum { X, Y, Z}
class MyClass {
@EnumDecorator(MyEnum)
name: string;
}
This problem occurs because the enum is not yet evaluated by the interpreter when attempting to use it with the decorator.
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