function assertArg(arg, name, reason) {
	if (!arg) {
		throw ngMinErr(
			"areq",
			"Argument '{0}' is {1}",
			name || "?",
			reason || "required"
		);
	}
	return arg;
}
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.