function getNonNumericOperand(node) {
	const left = node.left,
		right = node.right;

	if (right.type !== "BinaryExpression" && !isNumeric(right)) {
		return right;
	}

	if (left.type !== "BinaryExpression" && !isNumeric(left)) {
		return left;
	}

	return null;
}
Returns the first non-numeric operand in a BinaryExpression. Designed to be
used from bottom to up since it walks up the BinaryExpression trees using
node.parent to find the result.
@param {BinaryExpression} node The BinaryExpression node to be walked up on
@returns {ASTNode|null} The first non-numeric item in the BinaryExpression tree or null