declare global namespace variable from TypeScript

问题

How to explicitly declare a variable in the global namespace from typescript?

I need the compiler to generate the following javascript code:

MyExtension = someFunction()

unfortunately, I can only have it generate

var MyExtension = someFunction()

This comes to an issue with the latest version (still in rc) of meteor packages. Meteor introduced a way to scope namespaces in packages - the issue is, the variable needs to be defined in the global namespace (which meteor reroutes to its own Package object).

There is a video about it at https://www.eventedmind.com/posts/meteor-linker-package-namespacing.

Is there some kind of global keyword available or in the plans?

回答1:

Use the declare keyword. These are known as ambient declarations.

declare var MyExtentention:any;

来源：https://stackoverflow.com/questions/18171967/declare-global-namespace-variable-from-typescript