fix: allow chaining of onCreate, closes #1

[mfellner]

Allow chaining of onCreate, closes #1.

[codecov-commenter]

Codecov Report

Merging #2 (f9b1acc) into main (272c14d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           64        64           
  Branches         7         6    -1     
=========================================
  Hits            64        64           

Impacted Files	Coverage Δ
lib/store-factory.ts	100.00% <100.00%> (ø)

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