| Index: lib/filterValidation.js | 
| diff --git a/lib/filterValidation.js b/lib/filterValidation.js | 
| index f5de14b7a75c670802a37fa676a10cb51c51dcd5..9252ac1ca4d81523ce85711b1bef928713842904 100644 | 
| --- a/lib/filterValidation.js | 
| +++ b/lib/filterValidation.js | 
| @@ -17,6 +17,8 @@ | 
| /** @module filterValidation */ | 
| +"use strict"; | 
| + | 
| let {Filter, InvalidFilter, ElemHideBase} = require("filterClasses"); | 
| let {Utils} = require("utils"); | 
| @@ -63,7 +65,7 @@ FilterParsingError.prototype = { | 
| * | 
| * @return {string} | 
| */ | 
| - toString: function() | 
| + toString() | 
| { | 
| let message; | 
| if (this.reason) | 
| @@ -115,7 +117,7 @@ let parseFilter = | 
| * @param {string} text | 
| * @return {ParsedFilter} | 
| */ | 
| -exports.parseFilter = function(text) | 
| +exports.parseFilter = text => | 
| { | 
| let filter = null; | 
| text = Filter.normalize(text); | 
| @@ -149,7 +151,7 @@ exports.parseFilter = function(text) | 
| * @param {string} text | 
| * @return {ParsedFilters} | 
| */ | 
| -exports.parseFilters = function(text) | 
| +exports.parseFilters = text => | 
| { | 
| let lines = text.split("\n"); | 
| let filters = []; |