Properly type the Map and Set objects (#5623) #112

Job	Run time
tests (ubuntu-latest)	1m 41s
lint (windows-latest)	1m 50s
build-prod (ubuntu-latest)	59s
tests (windows-latest)	6m 7s
lint (ubuntu-latest)	53s
build-prod (windows-latest)	3m 12s
licence-check (ubuntu-latest)	29s
licence-check (windows-latest)	1m 51s
typecheck (ubuntu-latest)	43s
alex (windows-latest)	2m 5s
typecheck (windows-latest)	2m 0s
shellcheck	5s
alex (ubuntu-latest)	24s
yarn-lock (ubuntu-latest)	31s
yarn-lock (windows-latest)	2m 6s
	24m 56s

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