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I'm interested in defining an existing framework (openlayers.d.ts) but cannot figure out how to express the fact that OpenLayers.Layer is both a class and a namespace for OpenLayers.Layer.Markers. I believe this makes Markers a nested class of Layer.
usage:
l = new OpenLayers.Layer(...); // this is a base class, never do this m = new OpenLayers.Layer.Markers(...); How would you declare both the Layer and Markers class in typescript?
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To create nested classes in TypeScript, we can create a static class property in our class. class Foo { static Bar = class {}; } const foo = new Foo(); const bar = new Foo. Bar(); to create the Foo class that has the static Bar property which is set to a class expression.
Is it possible to define nested/inner class in typescript? Yes, it is. Go to chapter 3 or 4 if you want to know only nested/inner class.
declare class is for when you want to describe an existing class (usually a TypeScript class, but not always) that is going to be externally present (for example, you have two . ts files that compile to two . js files and both are included via script tags in a webpage).
This seems like it has been fixed in versions 0.9.1.1 and later. You just have to create a module with the same name as the class where you want to nest types, and put your nested types in it.
More concretely, this is how you do it:
declare module a { class b { } module b { class c { } } } var myB = new a.b(); var myC = new a.b.c(); This works as well when nesting types in typescript code with the export keyword:
export module a { export class b { } export module b { export enum c { C1 = 1, C2 = 2, C3 = 3, } } } As mentioned by the user @recursive in the comments below, the order of declaration is important. So the class definition must be located before the module with the nested types.
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