nested class should have an export strategy

[MasseGuillaume]

input:

declare module 'vscode' {
  export class Position {
    readonly line: number;
    readonly character: number;
    constructor(line: number, character: number);
  }
}

https://github.com/Microsoft/vscode/blob/e74a6601c3714f98fc63102e8304b00c983b6167/src/vs/vscode.d.ts#L243-L267

output:

@js.native
@JSGlobal("vscode.Position")
class Position protected () extends js.Object {
  def this(line: Double, character: Double) = this()
  def line: Double = js.native
  def character: Double = js.native
}

This is wrong for the vscode project since they use modules to export their code. This is how you would do it with the common js syntax:

const vscode = require("vscode");
const pos = new vscode.Position(0, 0)

expected:

@js.native
@JSImport("vscode", "Position")
class Position protected () extends js.Object {
  def this(line: Double, character: Double) = this()
  def line: Double = js.native
  def character: Double = js.native
}

since from the definition we don't know if the class is exported or available on the global scope, it would make sense to pass a flag: export = global | module to specify the export strategy.