Typescriptify

[jcouyang]

No description provided.

[codecov-io]

Codecov Report

Merging #29 into master will decrease coverage by 2.1%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   99.15%   97.05%   -2.11%     
==========================================
  Files           3        4       +1     
  Lines         119      170      +51     
  Branches       16       25       +9     
==========================================
+ Hits          118      165      +47     
- Misses          1        5       +4

Impacted Files	Coverage Δ
src/history.ts	100% <100%> (ø)
src/interfaces.ts	88.23% <88.23%> (ø)
src/engine/most.ts	95.23% <95.23%> (ø)
src/react-most.ts	98.07% <97.87%> (ø)

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