refactor(ts): introduce a round of types

[JustinBeckwith]

No description provided.

[JustinBeckwith]

ping @kinwa91

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@f50fd13). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             master    #319   +/-   ##
========================================
  Coverage          ?   96.4%           
========================================
  Files             ?      13           
  Lines             ?    1057           
  Branches          ?     143           
========================================
  Hits              ?    1019           
  Misses            ?      32           
  Partials          ?       6

Impacted Files	Coverage Δ
src/snapshot.ts	100% <ø> (ø)
src/publisher.ts	98.03% <ø> (ø)
src/topic.ts	98.66% <ø> (ø)
src/subscription.ts	99.07% <ø> (ø)
src/iam.ts	100% <100%> (ø)
src/index.ts	100% <100%> (ø)
src/histogram.ts	100% <100%> (ø)
src/subscriber.ts	98.7% <100%> (ø)
src/connection-pool.ts	99.43% <100%> (ø)

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