ESLint custom rule: Disallow last property of a multiple property object to be declared on last line (no-multi-object-properties-last-line)

no-multi-object-properties-last-line.js

/* global module */

"use strict";

module.exports = function (context) {

    function checkObjectExpression(node) {

        var numberOfProperties = node.properties.length;
        var objHasMultipleProperties = (numberOfProperties > 1);
        var propertyOnSameLineAsClosingBrace;

        if (objHasMultipleProperties) {
            propertyOnSameLineAsClosingBrace = (node.properties[node.properties.length - 1].loc.end.line === node.loc.end.line);

            if (propertyOnSameLineAsClosingBrace) {
                context.report(
                    node,
                    {
                        line: node.properties[node.properties.length - 1].loc.end.line,
                        column: node.properties[node.properties.length - 1].loc.end.column
                    },
                    "object property on same line as closing brace"
                );
            }
        }
    }

    return {
        "ObjectExpression": checkObjectExpression
    };

};