| Index: lib/filterValidation.js | 
| diff --git a/lib/filterValidation.js b/lib/filterValidation.js | 
| index f5de14b7a75c670802a37fa676a10cb51c51dcd5..c280fcceba42d50b1b00ba55a1b5f0b091ba8a40 100644 | 
| --- a/lib/filterValidation.js | 
| +++ b/lib/filterValidation.js | 
| @@ -17,8 +17,10 @@ | 
|  | 
| /** @module filterValidation */ | 
|  | 
| -let {Filter, InvalidFilter, ElemHideBase} = require("filterClasses"); | 
| -let {Utils} = require("utils"); | 
| +"use strict"; | 
| + | 
| +const {Filter, InvalidFilter, ElemHideBase} = require("filterClasses"); | 
| +const {Utils} = require("utils"); | 
|  | 
| /** | 
| * An error returned by | 
| @@ -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 = []; | 
|  |