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Optionally enable external-helpers in tests (#12982)
* Optionally enable external-helpers in tests #12911 was a breaking change that now requires you to keep `babel-plugin-external-helpers` in your `package.json`. It'll will probably be unnoticeable for most, because another dependency could transitively depend on it, but AMP recently hit it when cleaning up our deps. * Cast to boolean * Fix package name
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