export EncodeOptions and DecodeOptions

[gfx]

resolve #99

[codecov-io]

Codecov Report

Merging #100 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
- Coverage   98.55%   98.54%   -0.01%     
==========================================
  Files          15       15              
  Lines         897      896       -1     
  Branches      188      188              
==========================================
- Hits          884      883       -1     
  Misses         13       13

Impacted Files	Coverage Δ
src/index.ts	100% <100%> (ø)	⬆️
src/decodeAsync.ts	100% <100%> (ø)	⬆️

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