support dynamic import

[Rich-Harris]

closes #1003

[codecov-io]

Codecov Report

Merging #1004 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1004      +/-   ##
==========================================
+ Coverage   92.06%   92.06%   +<.01%     
==========================================
  Files         115      115              
  Lines        4296     4297       +1     
  Branches     1369     1369              
==========================================
+ Hits         3955     3956       +1     
  Misses        148      148              
  Partials      193      193

Impacted Files	Coverage Δ
src/parse/read/script.ts	100% <100%> (ø)	⬆️

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