Use JSCS to check the coding style.

https://code.google.com/p/esprima/issues/detail?id=492

Author: ariya

.jscs.json

@@ -0,0 +1,119 @@
+{
+    "requireCurlyBraces": [
+        "if",
+        "else",
+        "for",
+        "while",
+        "do",
+        "try",
+        "catch"
+    ],
+    "requireSpaceAfterKeywords": [
+        "if",
+        "else",
+        "for",
+        "while",
+        "do",
+        "switch",
+        "return",
+        "try",
+        "catch"
+    ],
+    "requireParenthesesAroundIIFE": true,
+    "requireSpacesInFunctionExpression": {
+        "beforeOpeningCurlyBrace": true
+    },
+    "requireMultipleVarDecl": true,
+    "disallowEmptyBlocks": true,
+    "disallowSpacesInsideObjectBrackets": true,
+    "disallowSpacesInsideParentheses": true,
+    "requireSpacesInsideObjectBrackets": "all",
+    "disallowDanglingUnderscores": true,
+    "disallowSpaceAfterObjectKeys": true,
+    "requireCommaBeforeLineBreak": true,
+    "requireOperatorBeforeLineBreak": [
+        "?",
+        "+",
+        "-",
+        "/",
+        "*",
+        "=",
+        "==",
+        "===",
+        "!=",
+        "!==",
+        ">",
+        ">=",
+        "<",
+        "<="
+    ],
+    "disallowLeftStickedOperators": [
+        "?",
+        "+",
+        "-",
+        "/",
+        "*",
+        "=",
+        "==",
+        "===",
+        "!=",
+        "!==",
+        ">",
+        ">=",
+        "<",
+        "<="
+    ],
+    "requireRightStickedOperators": ["!"],
+    "disallowRightStickedOperators": [
+        "?",
+        "+",
+        "/",
+        "*",
+        ":",
+        "=",
+        "==",
+        "===",
+        "!=",
+        "!==",
+        ">",
+        ">=",
+        "<",
+        "<="
+    ],
+    "requireLeftStickedOperators": [","],
+    "disallowSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~", "!"],
+    "disallowSpaceBeforePostfixUnaryOperators": ["++", "--"],
+    "requireSpaceBeforeBinaryOperators": [
+        "+",
+        "-",
+        "/",
+        "*",
+        "=",
+        "==",
+        "===",
+        "!=",
+        "!=="
+    ],
+    "requireSpaceAfterBinaryOperators": [
+        "+",
+        "-",
+        "/",
+        "*",
+        "=",
+        "==",
+        "===",
+        "!=",
+        "!=="
+    ],
+    "disallowImplicitTypeConversion": ["numeric", "boolean", "binary", "string"],
+    "requireCamelCaseOrUpperCaseIdentifiers": true,
+    "disallowKeywords": ["with"],
+    "disallowMultipleLineStrings": true,
+    "validateLineBreaks": "LF",
+    "validateQuoteMarks": "'",
+    "disallowMixedSpacesAndTabs": true,
+    "disallowTrailingWhitespace": true,
+    "disallowKeywordsOnNewLine": ["else"],
+    "requireLineFeedAtFileEnd": true,
+    "requireDotNotation": true
+}

package.json

@@ -30,6 +30,7 @@
     "devDependencies": {
         "jslint": "~0.1.9",
         "eslint": "~0.3.0",
+        "jscs": "~1.2.4",
         "istanbul": "~0.1.27",
         "complexity-report": "~0.6.1",
         "regenerate": "~0.5.4",
@@ -48,7 +49,13 @@
         "generate-regex": "node tools/generate-identifier-regex.js",
 
         "test": "npm run-script lint && node test/run.js && npm run-script coverage && npm run-script complexity",
-        "lint": "node tools/check-version.js && node node_modules/eslint/bin/eslint.js esprima.js && node node_modules/jslint/bin/jslint.js esprima.js",
+
+        "lint": "npm run-script check-version && npm run-script eslint && npm run-script jscs && npm run-script jslint",
+        "check-version": "node tools/check-version.js",
+        "eslint": "node node_modules/eslint/bin/eslint.js esprima.js",
+        "jscs": "node node_modules/.bin/jscs esprima.js",
+        "jslint": "node node_modules/jslint/bin/jslint.js esprima.js",
+
         "coverage": "npm run-script analyze-coverage && npm run-script check-coverage",
         "analyze-coverage": "node node_modules/istanbul/lib/cli.js cover test/runner.js",
         "check-coverage": "node node_modules/istanbul/lib/cli.js check-coverage --statement -8 --branch -19 --function 100",