refactor(ErrorHelpers): Make error helpers named functions; add types #4102

Job	Run time
lint	2m 57s
basic	1m 51s
unit	1m 23s
integration (ubuntu-latest, 10.x, a)	29m 19s
integration (ubuntu-latest, 10.x, b)	27m 41s
integration (ubuntu-latest, 17.x, a)	24m 24s
integration (ubuntu-latest, 17.x, b)	24m 3s
integration (windows-latest, 10.x, a)	20m 21s
integration (windows-latest, 10.x, b)	33m 56s
integration (windows-latest, 17.x, a)	17m 13s
integration (windows-latest, 17.x, b)	43m 21s
integration (macos-latest, 10.x, a)	21m 31s
integration (macos-latest, 10.x, b)	16m 51s
integration (macos-latest, 17.x, a)	17m 36s
integration (macos-latest, 17.x, b)	16m 49s
integration (ubuntu-latest, 16.x, a)	25m 17s
integration (ubuntu-latest, 14.x, a)	23m 3s
integration (ubuntu-latest, 12.x, a)	31m 33s
	6h 19m 9s

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