introduced yarn workspace

packages/web/src/utility/common.js

@@ -0,0 +1,27 @@
+import uuidv1 from 'uuid/v1';
+
+export class LoadingToken {
+  constructor() {
+    this.isCanceled = false;
+  }
+
+  cancel() {
+    this.isCanceled = true;
+  }
+}
+
+export function sleep(milliseconds) {
+  return new Promise(resolve => window.setTimeout(() => resolve(null), milliseconds));
+}
+
+export function openNewTab(setOpenedTabs, newTab) {
+  const tabid = uuidv1();
+  setOpenedTabs(files => [
+    ...(files || []).map(x => ({ ...x, selected: false })),
+    {
+      tabid,
+      selected: true,
+      ...newTab,
+    },
+  ]);
+}