function isOutsideOfScope(reference) {
		const scope = scopeNode.range;
		const id = reference.identifier.range;

		return id[0] < scope[0] || id[1] > scope[1];
	}
Checks whether a given reference is inside of the specified scope or not.
@param {eslint-scope.Reference} reference A reference to check.
@returns {boolean} `true` if the reference is inside of the specified
     scope.