Fix #974 and #975

[Rich-Harris]

This supersedes #977

[codecov-io]

Codecov Report

Merging #980 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #980      +/-   ##
==========================================
+ Coverage   91.86%   91.94%   +0.07%     
==========================================
  Files         112      112              
  Lines        4108     4110       +2     
  Branches     1330     1332       +2     
==========================================
+ Hits         3774     3779       +5     
  Misses        143      143              
+ Partials      191      188       -3

Impacted Files	Coverage Δ
src/generators/dom/visitors/AwaitBlock.ts	93.87% <100%> (+6.64%)	⬆️

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