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src/server/sheets-utilities.js

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+// Use ES6/7 code
+const onOpen = () => {
+  SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
+    .createMenu('Custom scripts')
+    .addItem('Edit sheets [sample React project]', 'openDialog')
+    .addToUi();
+};
+
+const openDialog = () => {
+  let html = HtmlService.createHtmlOutputFromFile('dialog')
+    .setWidth(400)
+    .setHeight(600);
+  SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
+    .showModalDialog(html, 'Sheet Editor');
+};
+
+const getSheets = () => SpreadsheetApp.getActive().getSheets();
+
+const getActiveSheetName = () => SpreadsheetApp.getActive().getSheetName();
+
+const getSheetsData = () => {
+  let activeSheetName = getActiveSheetName();
+  return getSheets().map((sheet, index) => {
+    let sheetName = sheet.getName();
+    return {
+      text: sheetName,
+      sheetIndex: index,
+      isActive: sheetName === activeSheetName,
+    };
+  });
+};
+
+const addSheet = (sheetTitle) => {
+  SpreadsheetApp.getActive().insertSheet(sheetTitle);
+  return getSheetsData();
+};
+
+const deleteSheet = (sheetIndex) => {
+  let sheets = getSheets();
+  SpreadsheetApp.getActive().deleteSheet(sheets[sheetIndex]);
+  return getSheetsData();
+};
+
+const setActiveSheet = (sheetName) => {
+  SpreadsheetApp.getActive().getSheetByName(sheetName).activate();
+  return getSheetsData();
+};
+
+export {
+  onOpen,
+  openDialog,
+  getSheetsData,
+  addSheet,
+  deleteSheet,
+  setActiveSheet,
+};