Fail ESLint if number of violations exceeds threshold

readme.md

eslint --format eslint-formatter-threshold.js .

eslint-formatter-threshold.js

var thresholds = require('./eslint-thresholds.json');

module.exports = function(results) {
    'use strict';

    var frequency = {},
        thresholdViolations = [],
        allViols = 'total';

    results.forEach(function(file) {
        file.messages.forEach(function(err) {
            var rule = err.ruleId;
            if (frequency[rule]) {
                frequency[rule] = frequency[rule] + 1;
            } else {
                frequency[rule] = 1;
            }

            if (frequency[allViols]) {
                frequency[allViols] = frequency[allViols] + 1;
            } else {
                frequency[allViols] = 1;
            }
        });
    });

    // To recount current error numbers for the thresholds file, uncomment the following line:
    // console.log(JSON.stringify(frequency, null, 4));

    Object.keys(frequency).forEach(function(error) {
        // If a threshold for this error isn't listed in eslint-thresholds.json, assume it is 0
        var errorThreshold = 0 | thresholds[error];

        if (frequency[error] > errorThreshold) {
            thresholdViolations.push(
                'Too many ' + error + ' violations (found ' + frequency[error] + ', max ' + errorThreshold + ')'
            );
        }
    });

    if (thresholdViolations.length > 0) {
        thresholdViolations.sort(function(a, b) {
            if (a.substr(9, 5) === 'total') {
                return 1;
            } else {
                return a <= b ? -1 : 1;
            }
        });

        thresholdViolations.forEach(function(line) {
            console.log(line);  // eslint-disable-line no-console
        });
        process.exit(1);
    } else {
        process.exit(0);
    }
};

eslint-thresholds.js

{
    "quote-props": 2947,
    "total": 28543,
    "max-len": 1227,
    "no-underscore-dangle": 835,
    "no-undef": 2822,
    "no-restricted-syntax": 83,
    "no-param-reassign": 935,
    "wrap-iife": 205,
    "no-use-before-define": 688,
    "strict": 411,
    "global-require": 9,
    "consistent-return": 204,
    "no-return-assign": 111,
    "no-unused-expressions": 44,
    "dot-notation": 332,
    "no-unused-vars": 658,
    "no-sequences": 26,
    "camelcase": 2421,
    "no-floating-decimal": 7,
    "indent": 3723,
    "brace-style": 254,
    "newline-per-chained-call": 97,
    "no-console": 143,
    "vars-on-top": 1974,
    "no-extra-bind": 3,
    "no-shadow": 266,
    "no-alert": 59,
    "eqeqeq": 456,
    "no-unreachable": 1,
    "curly": 209,
    "radix": 43,
    "no-script-url": 2,
    "one-var-declaration-per-line": 78,
    "no-mixed-spaces-and-tabs": 4354,
    "no-new": 21,
    "no-useless-escape": 102,
    "default-case": 37,
    "no-loop-func": 9,
    "no-unneeded-ternary": 26,
    "no-cond-assign": 34,
    "no-throw-literal": 44,
    "no-redeclare": 131,
    "guard-for-in": 24,
    "no-empty": 6,
    "null": 4,
    "no-native-reassign": 2,
    "block-scoped-var": 2321,
    "no-array-constructor": 1,
    "no-shadow-restricted-names": 72,
    "no-nested-ternary": 6,
    "no-constant-condition": 8,
    "no-with": 1,
    "no-useless-concat": 29,
    "no-inner-declarations": 3,
    "no-dupe-keys": 2,
    "yoda": 8,
    "no-irregular-whitespace": 6,
    "no-multi-spaces": 6,
    "import/no-unresolved": 1,
    "no-new-wrappers": 1,
    "no-extend-native": 4,
    "no-multi-str": 2,
    "no-ex-assign": 1,
    "array-callback-return": 1,
    "no-regex-spaces": 2
}