Issue 4864 - Start using ESLint for adblockpluschrome

lib/filterValidation.js

Index: lib/filterValidation.js
diff --git a/lib/filterValidation.js b/lib/filterValidation.js
index c280fcceba42d50b1b00ba55a1b5f0b091ba8a40..545a6b69919dcdda308ecddc38b235bafc84d396 100644
--- a/lib/filterValidation.js
+++ b/lib/filterValidation.js
@@ -29,6 +29,9 @@ const {Utils} = require("utils");
  * indicating that a given filter cannot be parsed,
  * contains an invalid CSS selector or is a filter list header.
  *
+ * @param {string} type See documentation in the constructor below.
+ * @param {Object} [details] Contains the "reason" and / or "selector"
+ *                           properties.
  * @constructor
  */
 function FilterParsingError(type, details)
@@ -71,14 +74,19 @@ FilterParsingError.prototype = {
     if (this.reason)
       message = Utils.getString(this.reason);
     else
+    {
       message = ext.i18n.getMessage(
         this.type.replace(/-/g, "_"),
         "selector" in this ? "'" + this.selector + "'" : null
       );
+    }
 
     if (this.lineno)
-      message = ext.i18n.getMessage("line", this.lineno.toLocaleString()) + ": " + message;
-
+    {
+      message = ext.i18n.getMessage(
+        "line", this.lineno.toLocaleString()
+      ) + ": " + message;
+    }
     return message;
   }
 };
@@ -87,7 +95,7 @@ function isValidCSSSelector(selector)
 {
   let style = document.createElement("style");
   document.documentElement.appendChild(style);
-  let sheet = style.sheet;
+  let {sheet} = style;
   document.documentElement.removeChild(style);
 
   try
@@ -104,10 +112,10 @@ function isValidCSSSelector(selector)
 
 /**
  * @typedef ParsedFilter
- * @property {?Filter} [filter]  The parsed filter if it is valid.
- *                               Or null if the given string is empty.
- * @property {FilterParsingError} [error]  See {@link module:filterValidation~FilterParsingError FilterParsingError}
- *
+ * @property {?Filter} [filter]
+ *   The parsed filter if it is valid. Or null if the given string is empty.
+ * @property {FilterParsingError} [error]
+ *   See {@link module:filterValidation~FilterParsingError FilterParsingError}
  */
 
 let parseFilter =
@@ -130,19 +138,26 @@ exports.parseFilter = text =>
     filter = Filter.fromText(text);
 
     if (filter instanceof InvalidFilter)
-      return {error: new FilterParsingError("invalid-filter", {reason: filter.reason})};
-
+    {
+      return {error: new FilterParsingError("invalid-filter",
+                                            {reason: filter.reason})};
+    }
     if (filter instanceof ElemHideBase && !isValidCSSSelector(filter.selector))
-      return {error: new FilterParsingError("invalid-css-selector", {selector: filter.selector})};
+    {
+      return {error: new FilterParsingError("invalid-css-selector",
+                                            {selector: filter.selector})};
+    }
   }
 
-  return {filter: filter};
+  return {filter};
 };
 
 /**
  * @typedef ParsedFilters
- * @property {Filter[]} filters  The parsed result without invalid filters.
- * @property {FilterParsingError[]} errors  See {@link module:filterValidation~FilterParsingError FilterParsingError}
+ * @property {Filter[]} filters
+ *   The parsed result without invalid filters.
+ * @property {FilterParsingError[]} errors
+ *   See {@link module:filterValidation~FilterParsingError FilterParsingError}
  */
 
 /**
@@ -171,5 +186,5 @@ exports.parseFilters = text =>
     }
   }
 
-  return {filters: filters, errors: errors};
+  return {filters, errors};
 };