TypeScript dynamically generate string name to class mapping object

Question

This is a follow up question for TypeScript map function to change property type.

If I have the following

class A {  }
class B {  }
var var1 = [{ path: "aa", comp: "A" }, { path: "b", comp: "B" }];

Is there a way to programmatically generate a mapping object like this

var nameToClassMapping = {
    A: A,
    B: B
};

rather than hardcode it?

Nitzan Tomer · Accepted Answer · 2016-05-14 22:21:04Z

1

You can use a decorator to do that:

var nameToClassMapping = {};

function myDecorator(target: any) {
    nameToClassMapping[target.name] = target;
}

@myDecorator
class A { }

I haven't tested it, but it should work, or at least give you a way.

answered May 14, 2016 at 22:21

Nitzan Tomer

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3 Comments

Shawn Over a year ago

so the @myDecorator is used each class A and B? what is the scope if nameToClassMapping? Can you explain a bit? Thanks,

Nitzan Tomer Over a year ago

Yes, you need to use this decorator before every class you want to be able to map to. The decorator is just a function that is executed and it receives the class after it as parameter. The link in my question to the official documentation is a good place to start.

Shawn Over a year ago

Thanks for the answer.

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