Remove unnecessary expect error directives

Author: luin

formats/table.ts

@@ -24,6 +24,8 @@ class TableCell extends Block {
     return undefined;
   }
 
+  next: this | null;
+
   cellOffset() {
     if (this.parent) {
       return this.parent.children.indexOf(this);
@@ -56,15 +58,14 @@ class TableCell extends Block {
 }
 
 class TableRow extends Container {
+  children: LinkedList<TableCell>;
+  next: this | null;
+
   checkMerge() {
     if (super.checkMerge() && this.next.children.head != null) {
-      // @ts-expect-error all children are table cells
       const thisHead = this.children.head.formats();
-      // @ts-expect-error all children are table cells
       const thisTail = this.children.tail.formats();
-      // @ts-expect-error all children are table cells
       const nextHead = this.next.children.head.formats();
-      // @ts-expect-error all children are table cells
       const nextTail = this.next.children.tail.formats();
       return (
         thisHead.table === thisTail.table &&
@@ -81,7 +82,6 @@ class TableRow extends Container {
     (this.children as LinkedList<TableCell>).forEach(child => {
       if (child.next == null) return;
       const childFormats = child.formats();
-      // @ts-expect-error
       const nextFormats = child.next.formats();
       if (childFormats.table !== nextFormats.table) {
         const next = this.splitAfter(child);