optim: specify version in `@babel/plugin-transform-runtime`

[agilgur5]

Summary

Specify a version in @babel/plugin-transform-runtime's config to further optimize the output with newer helpers.

Details

• the default is 7.0.0, but we are on a newer version, so we can use newer / more optimized helpers

  • createSuper now seems to be used, which required 7.9.0: https://github.com/babel/babel/blob/9199565fa08d840c8f1cc86c1b22be119b538f2f/packages/babel-helpers/src/helpers.ts#L624
  • this seems to replace the possibleConstructorReturn and getPrototypeOf helpers

• roughly ~6% minified size decrease as a result!

• change babel.config.js's caching to include @babel/runtime's version since we would need to rebuild if it changes

Misc

Noticed that this was a field when stumbling upon the @babel/plugin-transform-runtime options in the Babel docs. Tested this simultaneously with #79 as they both affect the output

[codecov[bot]]

Codecov Report

Merging #80 (55e6e3d) into main (b14060c) will not change coverage. The diff coverage is n/a.

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##              main       #80   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines           75        75           
  Branches         9         9           
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  Hits            75        75           

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