Refactor to enforce strictNullChecks #657

Job	Run time
build-desktop (macos, development)	2m 3s
build-docker (macos)	18m 18s
build-desktop (macos, production)	2m 8s
build-docker (ubuntu)	2m 22s
build-desktop (ubuntu, development)	1m 0s
build-desktop (ubuntu, production)	1m 0s
build-web (macos, development)	2m 17s
build-desktop (windows, development)	6m 23s
build-web (macos, production)	3m 14s
build-desktop (windows, production)	4m 21s
build-web (macos, test)	1m 56s
build-web (ubuntu, development)	1m 10s
build-web (ubuntu, production)	1m 8s
build-web (ubuntu, test)	1m 9s
build-web (windows, development)	4m 0s
build-web (windows, production)	3m 50s
build-web (windows, test)	4m 22s
	1h 0m 41s

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