function getClosingParenOfParams(node) {
			return sourceCode.getTokenAfter(
				node.params[0],
				astUtils.isClosingParenToken,
			);
		}
Finds closing paren of parameters for the given arrow function.
It is assumed that the given arrow function has parens of parameters and that it has exactly one parameter.
@param {ASTNode} node `ArrowFunctionExpression` node.
@returns {Token} the closing paren of parameters.