fix(Subject): lift signature is now appropriate for stricter TS 2.4 c… #2722
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…hecks
Type safety wasn't really gauranteed with lift before because we survived for a long time with an incorrect type signature, TypeScript 2.4 introduces stricter type-checking, and all of a sudden
lift
onSubject
was breaking builds for those that are riding the wave of the latest-and-greatest.EDIT: Upon review, really not sure of any way this change could break anyone. So I'm going to push this through as a patch. It was basically building with an incorrect type signature in TS 2.3 and lower, so correcting it should not break anyone's builds.