Not Angular2, ecmascript commitee decided that when they agreed to make it a standard in ES6.
Jiří Špác

I believe what’s being referred to in her post is NgModules, which were introduced as a breaking change in RC5, and don’t have any direct relation to ES6 modules.

Angular 2 was already component based, but NgModules provided an additional layer of abstraction above component sets. Which has benefits for compiling and lazy loading, but was a massive refactoring to come that late in the release candidate cycle.

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