foo = (a: number) : number => {}
bar = () : string => {}

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[
	["function-variable", "foo"], ["operator", "="],
	["punctuation", "("], "a", ["punctuation", ":"],
	["type", "number"], ["punctuation", ")"],
	["punctuation", ":"], ["type", "number"],
	["operator", "=>"], ["punctuation", "{"], ["punctuation", "}"],
	["function-variable", "bar"], ["operator", "="],
	["punctuation", "("], ["punctuation", ")"],
	["punctuation", ":"], ["type", "string"],
	["operator", "=>"], ["punctuation", "{"], ["punctuation", "}"]
]

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Checks for function variables containing types.