added helper for handling errors

post_component.js

···
         this.post.viewerLike = like.uri;
         heart.classList.add('liked');
         count.innerText = String(parseInt(count.innerText, 10) + 1);
-      }).catch((error) => {
-        console.log(error);
-        alert(error);
-      });
+      }).catch(showError);
     } else {
       accountAPI.removeLike(this.post.viewerLike).then(() => {
         this.post.viewerLike = undefined;
         heart.classList.remove('liked');
         count.innerText = String(parseInt(count.innerText, 10) - 1);
-      }).catch((error) => {
-        console.log(error);
-        alert(error);
-      });
+      }).catch(showError);
     }
   }
 }

skythread.js

···
     });
   }).catch(error => {
     hideLoader();
-    console.log(error);
-    alert(error);
+    showError(error);
   });
 }
 
···
     let view = component.buildElement();
 
     nodeToUpdate.querySelector('.content').replaceWith(view.querySelector('.content'));
-  }).catch(error => {
-    console.log(error);
-    alert(error);
-  });
+  }).catch(showError);
 }
 
 /** @param {Post} post, @param {AnyElement} nodeToUpdate */
···
         let view = component.buildElement();
         content.append(view);
       }
-    }).catch(error => {
-      console.log(error);
-      alert(error);
-    });
-  }).catch(error => {
-    console.log(error);
-    alert(error);
-  });
+    }).catch(showError);
+  }).catch(showError);
 }

utils.js

···
   return location.origin + location.pathname;
 }
 
+/** @param {object} error */
+
+function showError(error) {
+  console.log(error);
+  alert(error);  
+}
+
 /** @param {Date} date1, @param {Date} date2, @returns {boolean} */
 
 function sameDay(date1, date2) {