flowtype refactoring

[kazupon]

No description provided.

[codecov-io]

Codecov Report

Merging #4945 into dev will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff          @@
##            dev   #4945   +/-   ##
====================================
  Coverage   100%    100%           
====================================
  Files        83      83           
  Lines      3374    3374           
====================================
  Hits       3374    3374

Impacted Files	Coverage Δ
src/core/vdom/helpers/merge-hook.js	100% <100%> (ø)	✅
...atforms/web/runtime/components/transition-group.js	100% <100%> (ø)	✅
src/core/components/keep-alive.js	100% <100%> (ø)	✅
src/platforms/web/runtime/components/transition.js	100% <100%> (ø)	✅
src/core/vdom/helpers/index.js	100% <100%> (ø)	✅
src/platforms/web/runtime/transition-util.js	100% <100%> (ø)	✅

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