Creates a table with four columns and seven rows. - Shared with Script Lab

Create a table.yaml

name: Create a table
description: Creates a table with four columns and seven rows.
author: deinspanjer
host: EXCEL
api_set: {}
script:
    content: |
        $("#create-table").click(createTable);

        $("#delete-rows").click(deleteRows);

        async function createTable() {
            try {
                await Excel.run(async (context) => {

                    await OfficeHelpers.ExcelUtilities.forceCreateSheet(context.workbook, "Sample");

                    const sheet = context.workbook.worksheets.getItem("Sample");

                    const expensesTable = sheet.tables.add("A1:D1", true /*hasHeaders*/);
                    expensesTable.name = "ExpensesTable";

                    expensesTable.getHeaderRowRange().values = [["Date", "Merchant", "Category", "Amount"]];

                    expensesTable.rows.add(null /*add at the end*/, [
                        ["1/1/2017", "The Phone Company", "Communications", "$120"],
                        ["1/2/2017", "Northwind Electric Cars", "Transportation", "$142"],
                        ["1/5/2017", "Best For You Organics Company", "Groceries", "$27"],
                        ["1/10/2017", "Coho Vineyard", "Restaurant", "$33"],
                        ["1/11/2017", "Bellows College", "Education", "$350"],
                        ["1/15/2017", "Trey Research", "Other", "$135"],
                        ["1/15/2017", "Best For You Organics Company", "Groceries", "$97"]
                    ]);

                    if (Office.context.requirements.isSetSupported("ExcelApi", 1.2)) {
                        sheet.getUsedRange().format.autofitColumns();
                        sheet.getUsedRange().format.autofitRows();
                    }

                    sheet.activate();

                    await context.sync();
                });
            }
            catch (error) {
                OfficeHelpers.UI.notify(error);
                OfficeHelpers.Utilities.log(error);
            }
        }
        async function deleteRows() {
            try {
                await Excel.run(async (context) => {

                    const expensesTable = context.workbook.tables.getItem("ExpensesTable")

                    const bodyRows = expensesTable.getDataBodyRange().load("rowCount");
                    context.sync().then(() => {
                        if (bodyRows.rowCount == 7) {
                            const lastThreeRows = bodyRows.getOffsetRange(4, 0).getResizedRange(-4, 0);

                            // 1. Why is this needed?
                            // 2. Why shouldn't it have await as a prefix?
                            context.sync();
                            lastThreeRows.delete(null);
                        }
                    });
                });
            }
            catch (error) {
                OfficeHelpers.UI.notify(error);
                OfficeHelpers.Utilities.log(error);
            }
        }
    language: typescript
template:
    content: "<section class=\"ms-font-m\">\n    <p>This sample shows how to create a table using the Excel JavaScript API.</p>\n</section>\n\n<section class=\"samples ms-font-m\">\n    <h3>Try it out</h3>\n    <button id=\"create-table\" class=\"ms-Button\">\n        <span class=\"ms-Button-label\">Create table</span>\n    </button>\n    <br/>\n\t<button id=\"delete-rows\" class=\"ms-Button\">\n        <span class=\"ms-Button-label\">Delete a few rows</span>\n    </button></section>\n"
    language: html
style:
    content: |
        section.samples {
            margin-top: 20px;
        }

        section.samples .ms-Button, section.setup .ms-Button {
            display: block;
            margin-bottom: 5px;
            margin-left: 20px;
            min-width: 80px;
        }
    language: css
libraries: |
    // Office.js
    https://appsforoffice.microsoft.com/lib/1/hosted/office.js

    // CSS Libraries
    office-ui-fabric-js@1.4.0/dist/css/fabric.min.css
    office-ui-fabric-js@1.4.0/dist/css/fabric.components.min.css

    // NPM libraries
    core-js@2.4.1/client/core.min.js
    @microsoft/office-js-helpers@0.7.4/dist/office.helpers.min.js
    jquery@3.1.1

    // IntelliSense: @types/library or node_modules paths or URL to d.ts files
    @types/office-js
    @types/core-js
    @microsoft/office-js-helpers@0.7.4/dist/office.helpers.d.ts
    @types/jquery