allow keyed each block to have static content

[Rich-Harris]

fixes #1291

[codecov-io]

Codecov Report

Merging #1292 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1292      +/-   ##
==========================================
+ Coverage   91.65%   91.66%   +<.01%     
==========================================
  Files         122      122              
  Lines        4328     4329       +1     
  Branches     1364     1365       +1     
==========================================
+ Hits         3967     3968       +1     
  Misses        148      148              
  Partials      213      213

Impacted Files	Coverage Δ
src/generators/nodes/EachBlock.ts	97.61% <100%> (+0.01%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 78f506a...01a10d9. Read the comment docs.