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

/**
 * require and specify a consistent function style for components
 *
 * Anonymous or named functions inside AngularJS components.
 * The first parameter sets which type of function is required and can be 'named' or 'anonymous'.
 * The second parameter is an optional list of angular object names.
 *
 * @linkDescription require and specify a consistent function style for components ('named' or 'anonymous')
 * @styleguideReference {johnpapa} `y024` Named vs Anonymous Functions
 * @version 0.1.0
 * @category conventions
 * @sinceAngularVersion 1.x
 */
'use strict';

var utils = require('./utils/utils');

module.exports = {
    meta: {
        schema: [{
            enum: [
                'named',
                'anonymous'
            ]
        }, {
            type: 'array',
            items: {
                type: 'string'
            }
        }]
    },
    create: function(context) {
        var angularObjectList = ['animation', 'config', 'constant', 'controller', 'directive', 'factory', 'filter', 'provider', 'service', 'value', 'decorator'];
        var configType = context.options[0] || 'anonymous';
        var messageByConfigType = {
            anonymous: 'Use anonymous functions instead of named function',
            named: 'Use named functions instead of anonymous function'
        };
        var message = messageByConfigType[configType];

        if (context.options[1]) {
            angularObjectList = context.options[1];
        }

        function checkType(arg) {
            return utils.isCallExpression(arg) ||
                (configType === 'named' && (utils.isIdentifierType(arg) || utils.isNamedInlineFunction(arg))) ||
                (configType === 'anonymous' && utils.isFunctionType(arg) && !utils.isNamedInlineFunction(arg));
        }

        return {

            CallExpression: function(node) {
                var callee = node.callee;
                var angularObjectName = callee.property && callee.property.name;
                var firstArgument = node.arguments[1];

                if (utils.isAngularComponent(node) && callee.type === 'MemberExpression' && angularObjectList.indexOf(angularObjectName) >= 0) {
                    if (checkType(firstArgument)) {
                        return;
                    }

                    if (utils.isArrayType(firstArgument)) {
                        var last = firstArgument.elements[firstArgument.elements.length - 1];
                        if (checkType(last) || (!utils.isFunctionType(last) && !utils.isIdentifierType(last))) {
                            return;
                        }
                    }

                    context.report(node, message, {});
                }
            }
        };
    }
};