| io.reactivex.CompletableTransformer | 
Convenience interface and callback used by the compose operator to turn a Completable into another Completable fluently.
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| abstract CompletableSource | apply(Completable upstream) Applies a function to the upstream Completable and returns a CompletableSource. | ||||||||||
Applies a function to the upstream Completable and returns a CompletableSource.
| upstream | the upstream Completable instance | 
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