Small linter using jsl which will detect python-style variable names and complain. Usable as a precommit hook with: git diff --cached --name-only --diff-filter=ACM | grep ".js" | xargs node lint.js

gistfile1.js

var lint = require('jsl')
    , linter = lint();

linter.rule('variable > id',
    function (node, subsource, alert) {
      var var_name = node.name;
      if (var_name.indexOf("_") !== -1) {
        alert(node, 'Found variable name with underscores: ' + var_name);
      }
    }, 'error');


linter.cli();