Add getWrappedInstance() to translate wrapper

[vpriem]

Sometimes you need to access to the component instance wrapped in the component returned by translate().

No magic, just copied the approach of react-redux connect.

[jamuhl]

why not just https://github.com/i18next/react-i18next/blob/master/src/translate.js#L65

[vpriem]

As far as i understand Translate.WrappedComponent is more to access to the component, for server side rendering as described in pull request #15, but not to the rendered instance itself. With getWrappedInstance() you could access to the instance using ref. Should I provide an example?

[jamuhl]

ok i see. can you remove the dependency on invariant? prefer to keep dependencies low.

[jamuhl]

will be merged afterwards...

[vpriem]

I was thinking of that. Of course I can but should I remove invariant completely, throwing an exception if { withRef: true } was not provided? Or should I add invariant as external to the rollup config and let developers manage the dependency by themselves?

[jamuhl]

i would prefer removing it completely...console.error might be good enough?

[vpriem]

As you want, just removed all invariant deps and added console.error.

[jamuhl]

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