The Harmony option should not have any adverse effect on code that doesn't use ES6 features. On the other hand, it is becoming the standard way to write React code, because it allows succint functional expressions and other smart features.
I did not update the version information, because it's not clear to me how you wish to manage your versions. I would suggest using the same version string for both packages and appending the React version to it. For example the next revision of both packages could be named 1.1.3-0.13.2, since there's already a 1.1.2 mentioned here.
The Harmony option should not have any adverse effect on code that doesn't use ES6 features. On the other hand, it is becoming the standard way to write React code, because it allows succint functional expressions and other smart features.
See https://github.com/peh/react-grails-asset-pipeline/issues/3
I did not update the version information, because it's not clear to me how you wish to manage your versions. I would suggest using the same version string for both packages and appending the React version to it. For example the next revision of both packages could be named 1.1.3-0.13.2, since there's already a 1.1.2 mentioned here.