function isStringType(node) {
	return (
		astUtils.isStringLiteral(node) ||
		(node.type === "CallExpression" &&
			node.callee.type === "Identifier" &&
			node.callee.name === "String")
	);
}
Checks whether an expression evaluates to a string.
@param {ASTNode} node node that represents the expression to check.
@returns {boolean} Whether or not the expression evaluates to a string.