lib/rules/arg-overflow.js
function inspectFunctionDeclaration(emitted) {
            let node = emitted.node, params = node.params || [];

            let startLine = sourceCode.getLine(node),
                lastArgLine = params.length ? sourceCode.getEndingLine(params.slice(-1) [0]) : startLine;

            if (emitted.exit) {
                return;
            }

            if (startLine === lastArgLine) {
                if (params.length > MAX_IN_SINGLE_LINE) {
                    context.report({
                        node: node,
                        message: "In case of more than " + MAX_IN_SINGLE_LINE + " parameters, drop each into its own line."
                    });
                }
                return;
            }
        }
function inspectFunctionDeclaration(emitted) {
            let node = emitted.node, params = node.params || [];

            let startLine = sourceCode.getLine(node),
                lastArgLine = params.length ? sourceCode.getEndingLine(params.slice(-1) [0]) : startLine;

            if (emitted.exit) {
                return;
            }

            if (startLine === lastArgLine) {
                if (params.length > MAX_IN_SINGLE_LINE) {
                    context.report({
                        node: node,
                        message: "In case of more than " + MAX_IN_SINGLE_LINE + " parameters, drop each into its own line."
                    });
                }
                return;
            }
        }
function params (if on multiple lines)