fix rollup tips

[mniya]

fix rollup tips:Treating 'rxjs/add/operator/first' as external dependency
No name was provided for external module 'rxjs/add/operator/first' in options.globals – guessing 'rxjs_add_operator_first'

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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[jelbourn]

@mniya Thanks! Could you sign the CLA? LGTM aside from that.

[mniya]

I signed it!

[mniya]

Can you help me closed it?This commit has some problems.I can re pull request.

[jelbourn]

@mniya your changes are fine, the CLA is just missing

[mniya]

@googlebot I signed it!

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