eslint-plugin-lodash/lib/rules/callback-binding.js

Lodash specific linting rules for ESLint

/**
 * @fileoverview Rule to disallow the use of a chain for a single method
 */
'use strict';

/**
 * @fileoverview Rule to disallow the use of a chain for a single method
 */
// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------

module.exports = {
    create: function create(context) {
        var _require = require('../util/lodashUtil');

        var getLodashMethodVisitors = _require.getLodashMethodVisitors;

        var _require2 = require('../util/astUtil');

        var getMethodName = _require2.getMethodName;

        var _require$getSettings = require('../util/settingsUtil').getSettings(context);

        var version = _require$getSettings.version;

        var transformerMethods = ['reduce', 'reduceRight', 'transform'];

        function isBound(node) {
            return node && node.type === 'CallExpression' && getMethodName(node) === 'bind' && node.arguments.length === 1;
        }

        var callExpressionReporters = {
            3: function _(node, iteratee) {
                if (isBound(iteratee)) {
                    context.report(iteratee.callee.property, 'Unnecessary bind, pass `thisArg` to lodash method instead');
                }
            },
            4: function _(node, iteratee, _ref) {
                var method = _ref.method;

                var isTransformerMethod = transformerMethods.includes(method);
                var iterateeIndex = node.arguments.indexOf(iteratee);
                if (iterateeIndex !== -1 && (isTransformerMethod && node.arguments[iterateeIndex + 2] || !isTransformerMethod && node.arguments[iterateeIndex + 1])) {
                    context.report(iteratee, 'Do not use Lodash 3 thisArg, use binding instead');
                }
            }
        };

        return getLodashMethodVisitors(context, callExpressionReporters[version]);
    }
};