Make interface-defined modules work with CommonJS/ES6Module interop #405
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With a normal CommonJS module, when the exports object is assigned we mark it as a CommonJS default export. This lets the flow system understand that it needs to be mapped properly to an ES6 ModuleNamespace object when imported from an ES6 module.
Declared modules, however, weren't treating their exports in this way as well. This fixes the issue by marking declared module exports as CJSDefault.
More tangibly, this PR fixes this issue: #400