eslint-plugin-angular/rules/typecheck-function.js

ESLint rules for AngularJS projects

/**
 * use `angular.isFunction` instead of `typeof` comparisons
 *
 * You should use the angular.isFunction method instead of the default JavaScript implementation (typeof function(){} ==="[object Function]").
 *
 * @version 0.1.0
 */
'use strict';

module.exports = function(context) {
    var utils = require('./utils/utils');

    function recordError(node, origin) {
        if (node.type === 'Literal' && (node.value === 'function' || node.value === '[object Function]')) {
            context.report(origin, 'You should use the angular.isFunction method', {});
        }
    }

    return {

        BinaryExpression: function(node) {
            if (node.operator === '===' || node.operator === '!==') {
                if (utils.isTypeOfStatement(node.left) || utils.isToStringStatement(node.left)) {
                    recordError(node.right, node);
                } else if (utils.isTypeOfStatement(node.right) || utils.isToStringStatement(node.right)) {
                    recordError(node.left, node);
                }
            }
        }
    };
};

module.exports.schema = [
    // JSON Schema for rule options goes here
];