WordPress .jscsrc file: Expanded rules from WordPress which extends jQuery JSCS presets https://github.com/jscs-dev/node-jscs/blame/master/presets/

.jscsrc

{
    "disallowKeywords": [ "with" ],
    "disallowKeywordsOnNewLine": [ "else" ],
    "disallowMixedSpacesAndTabs": "smart",
    "disallowMultipleLineBreaks": true,
    "disallowMultipleLineStrings": true,
    "disallowSpaceAfterObjectKeys": true,
    "disallowSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~"],
    "disallowSpaceBeforeBinaryOperators": [ ",", ":" ],
    "disallowSpaceBeforeComma": true,
    "disallowSpaceBeforePostfixUnaryOperators": true,
    "disallowSpacesInAnonymousFunctionExpression": {
        "beforeOpeningRoundBrace": true
    },
    "disallowSpacesInCallExpression": true,
    "disallowSpacesInFunctionExpression": {
        "beforeOpeningRoundBrace": true
    },
    "disallowSpacesInNamedFunctionExpression": {
        "beforeOpeningRoundBrace": true
    },
    "disallowTrailingComma": true,
    "disallowTrailingWhitespace": true,
    "requireBlocksOnNewline": true,
    "requireCamelCaseOrUpperCaseIdentifiers": "ignoreProperties",
    "requireCapitalizedComments": {
        "allExcept": ["global", "exported", "jshint", "eslint", "jslint"]
    },
    "requireCommaBeforeLineBreak": true,
    "requireCurlyBraces": [
        "if",
        "else",
        "for",
        "while",
        "do",
        "try",
        "catch"
    ],
    "requireDotNotation": {
        "allExcept": ["snake_case", "keywords"]
    },
    "requireLineFeedAtFileEnd": true,
    "requireOperatorBeforeLineBreak": true,
    "requirePaddingNewLinesBeforeLineComments": true,
    "requireParenthesesAroundIIFE": true,
    "requireSemicolons": true,
    "requireSpaceAfterBinaryOperators": true,
    "requireSpaceAfterComma": true,
    "requireSpaceAfterKeywords": [
        "if",
        "else",
        "for",
        "while",
        "do",
        "switch",
        "return",
        "try",
        "catch"
    ],
    "requireSpaceAfterPrefixUnaryOperators": ["!"],
    "requireSpaceBeforeBinaryOperators": [
        "=", "+=", "-=", "*=", "/=", "%=", "<<=", ">>=", ">>>=",
        "&=", "|=", "^=", "+=",

        "+", "-", "*", "/", "%", "<<", ">>", ">>>", "&",
        "|", "^", "&&", "||", "===", "==", ">=",
        "<=", "<", ">", "!=", "!=="
    ],
    "requireSpaceBeforeBlockStatements": true,
    "requireSpaceBetweenArguments": true,
    "requireSpacesInAnonymousFunctionExpression": {
        "beforeOpeningCurlyBrace": true
    },
    "requireSpacesInConditionalExpression": true,
    "requireSpacesInForStatement": true,
    "requireSpacesInFunctionExpression": {
        "beforeOpeningCurlyBrace": true
    },
    "requireSpacesInNamedFunctionExpression": {
        "beforeOpeningCurlyBrace": true
    },
    "requireSpacesInsideObjectBrackets": "all",
    "requireSpacesInsideParentheses": {
        "all": true,
        "except": [ "{", "}", "[", "]", "function" ]
    },
    "requireVarDeclFirst": true,
    "requireYodaConditions": ["==", "!=", "===", "!=="],
    "validateLineBreaks": "LF",
    "validateQuoteMarks": "'"
}

https://make.wordpress.org/core/handbook/best-practices/coding-standards/javascript/#spacing

"Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). This is a “soft” rule, but long lines generally indicate unreadable or disorganized code."

The following should be added, currently it is overridden with null in the JSCS WordPress preset:

"maximumLineLength": {
        "value": 100,
        "tabSize": 4,
    },

Maybe some exceptions will be needed such as jQuery's "allExcept": ["urlComments", "regex"]