Use preconstruct to build preconstruct

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[changeset-bot]

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Latest commit: 7911a3e

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[codecov]

Codecov Report

Merging #79 into master will decrease coverage by 0.16%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
- Coverage   84.87%   84.71%   -0.17%     
==========================================
  Files          29       29              
  Lines         820      811       -9     
  Branches      144      144              
==========================================
- Hits          696      687       -9     
  Misses        110      110              
  Partials       14       14

Impacted Files	Coverage Δ
...ruct/src/rollup-plugins/flow-and-prod-dev-entry.js	100% <ø> (ø)	⬆️
packages/preconstruct/src/build/rollup.js	71.79% <ø> (-3.77%)	⬇️
packages/preconstruct/src/worker.js	0% <ø> (-33.34%)	⬇️
packages/preconstruct/src/messages.js	100% <ø> (ø)	⬆️
packages/preconstruct/src/constants.js	100% <100%> (ø)	⬆️
packages/preconstruct/src/worker-client.js	81.81% <66.66%> (+1.81%)	⬆️

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