Add TypeScript typing, dependency updates, and housekeeping. #4

Job	Run time
build_and_test / build (18)	22s
build_and_test / build (20)	23s
build_and_test / build (22)	23s
build_and_test / collect_coverage_reports	5s
lint / ESLint	14s
lint-docs / Lint TypeDoc	11s
	1m 38s

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