Noissue - Update JSDoc to mark optionals in lib/elemHide.js

lib/elemHide.js

Index: lib/elemHide.js
===================================================================
--- a/lib/elemHide.js
+++ b/lib/elemHide.js
@@ -37,21 +37,24 @@
  * @type {Map.<string,Filter>}
  */
 let filterBySelector = new Map();
 
 /**
  * This array caches the keys of filterBySelector table (selectors
  * which unconditionally apply on all domains). It will be null if the
  * cache needs to be rebuilt.
+ * @type {?string[]}
  */
 let unconditionalSelectors = null;
 
 /**
  * Map to be used instead when a filter has a blank domains property.
+ * @type {Map.<string,boolean>}
+ * @const
  */
 let defaultDomains = new Map([["", true]]);
 
 /**
  * Set containing known element hiding and exception filters
  * @type {Set.<ElemHideBase>}
  */
 let knownFilters = new Set();
@@ -180,18 +183,18 @@
     knownFilters.delete(filter);
     FilterNotifier.emit("elemhideupdate");
   },
 
   /**
    * Checks whether an exception rule is registered for a filter on a particular
    * domain.
    * @param {Filter} filter
-   * @param {string} docDomain
-   * @return {ElemHideException}
+   * @param {?string} docDomain
+   * @return {?ElemHideException}
    */
   getException(filter, docDomain)
   {
     let list = exceptions.get(filter.selector);
     if (!list)
       return null;
 
     for (let i = list.length - 1; i >= 0; i--)
@@ -212,28 +215,34 @@
     if (!unconditionalSelectors)
       unconditionalSelectors = [...filterBySelector.keys()];
     return unconditionalSelectors.slice();
   },
 
   /**
    * Constant used by getSelectorsForDomain to return all selectors applying to
    * a particular hostname.
+   * @type {number}

[Manish Jethani, 2018/05/09 17:16:57]

Unrelated but helpful.

+   * @const
    */
   ALL_MATCHING: 0,
 
   /**
    * Constant used by getSelectorsForDomain to exclude selectors which apply to
    * all websites without exception.
+   * @type {number}
+   * @const
    */
   NO_UNCONDITIONAL: 1,
 
   /**
    * Constant used by getSelectorsForDomain to return only selectors for filters
    * which specifically match the given host name.
+   * @type {number}
+   * @const
    */
   SPECIFIC_ONLY: 2,
 
   /**
    * Determines from the current filter list which selectors should be applied
    * on a particular host name.
    * @param {string} domain
    * @param {number} [criteria]