@coffeelint/cli/lib/rules/no_stand_alone_at.js

Lint your CoffeeScript

(function() {
  var NoStandAloneAt;

  module.exports = NoStandAloneAt = (function() {
    class NoStandAloneAt {
      lintToken(token, tokenApi) {
        var isAStart, isDot, isProp, isProtoProp, nextToken, noSpace, ref, ref1;
        [nextToken] = tokenApi.peek();
        noSpace = !token.spaced;
        isProp = nextToken === 'PROPERTY';
        isAStart = nextToken === 'INDEX_START' || nextToken === 'CALL_START'; // @[] or @()
        isDot = nextToken === '.';
        // https://github.com/jashkenas/coffee-script/issues/1601
        // @::foo is valid, but @:: behaves inconsistently and is planned for
        // removal. Technically @:: is a stand alone ::, but I think it makes
        // sense to group it into no_stand_alone_at
        isProtoProp = nextToken === '::' && ((ref = (ref1 = tokenApi.peek(2)) != null ? ref1[0] : void 0) === 'PROPERTY');
        // Return an error after an '@' token unless:
        // 1: there is a '.' afterwards (isDot)
        // 2: there isn't a space after the '@' and the token following the '@'
        // is an property, the start of an index '[' or is an property after
        // the '::'
        if (!(isDot || (noSpace && (isProp || isAStart || isProtoProp)))) {
          return {token};
        }
      }

    };

    NoStandAloneAt.prototype.rule = {
      type: 'style',
      name: 'no_stand_alone_at',
      level: 'ignore',
      message: '@ must not be used stand alone',
      description: `This rule checks that no stand alone @ are in use, they are
discouraged. Further information in CoffeeScript issue <a
href="https://github.com/jashkenas/coffee-script/issues/1601">
#1601</a>`
    };

    NoStandAloneAt.prototype.tokens = ['@'];

    return NoStandAloneAt;

  }).call(this);

}).call(this);