close #218

add Array.prototype.at polyfill to fix js error in weixin

packages/client/src/pages/_app.tsx

@@ -4,6 +4,7 @@ import 'styles/globals.scss';
 import 'tiptap/core/styles/index.scss';
 import '@react-pdf-viewer/core/lib/styles/index.css';
 import '@react-pdf-viewer/default-layout/lib/styles/index.css';
+import 'thirtypart/array-prototype-at';
 
 import { Worker } from '@react-pdf-viewer/core';
 import { isMobile } from 'helpers/env';

packages/client/src/thirtypart/array-prototype-at.js

@@ -0,0 +1,8 @@
+if (![].at) {
+  Array.prototype.at = function at(n) {
+    n = Math.trunc(n) || 0;
+    if (n < 0) n += this.length;
+    if (n < 0 || n >= this.length) return undefined;
+    return this[n];
+  };
+}