原文： https://blog.oio.de/2014/03/21/inner-classes-typescript/
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In TypeScript, there is no exlicit concept like inner classes.
So what you cannot do in TypeScript is as follows:
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class
Foo {
export
class
InnerFoo {
}
}
new
Foo.InnerFoo();
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You can achieve something similar by merging a class with a module containing the inner class.
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class
Foo {
}
module Foo {
export
class
InnerFoo {
doIt(){}
}
}
new
Foo.InnerFoo();
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The merging happens implicitely by using the same name for the class and the module.
Of course you can use the inner class in the outer class:
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class
Foo {
doSomethingWithInnerFoo() {
new
Foo.InnerFoo().doIt();
}
}
module Foo {
export
class
InnerFoo { doIt(){} }
}
new
Foo().doSomethingWithInnerFoo();
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The only downside here is that the inner class must be exported, so it is always visible to the outside – there are no private inner classes.