Catch errors in search worker

src/assets/javascripts/modules/search/_/index.ts

@@ -181,21 +181,13 @@ export class Search {
    * page. For this reason, section results are grouped within their respective
    * articles which are the top-level results that are returned.
    *
-   * Rogue control characters must be filtered before handing the query to the
-   * search index, as lunr will throw otherwise.
-   *
    * @param query - Query string
    *
    * @return Search results
    */
   public search(query: string): SearchResult[] {
-    query = query
+    if (query) {
-      .replace(/(?:^|\s+)[*+-:^~]+(?=\s+|$)/g, "")
+      try {
-      .trim()
-
-    /* Abort early, if query is empty */
-    if (!query)
-      return []
 
         /* Group sections by containing article */
         const groups = this.index.search(query)
@@ -223,6 +215,16 @@ export class Search {
             return fn(this.documents.get(section.ref) as SectionDocument)
           })
         }))
+
+      /* Log errors to console (for now) */
+      } catch (err) {
+        // tslint:disable-next-line no-console
+        console.warn(`Invalid query: ${query} – see https://bit.ly/2s3ChXG`)
+      }
+    }
+
+    /* Return nothing in case of error or empty query */
+    return []
   }
 
   /**