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I was just checking the files generated by angular cli. I noticed that tsconfig.spec.json is using commonJs as module, and tsconfig.app.json is using es2015 as module.

Is there any reason for choosing different module implementations?

Angular CLI version: 1.1.1

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tsconfig.spec.json is used for testing, which runs in node.js environment, while tsconfig.app.json is being used to prepare the app for browser based run, hence the different moduling implementations.

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