feat(helper): add excel helper

Author: masb0ymas

src/helpers/Excel.ts

@@ -0,0 +1,40 @@
+import * as ExcelJS from 'exceljs'
+
+class ExcelHelper {
+  /**
+   *
+   * @param headers
+   * @param data
+   */
+  public static async generate(
+    headers: Partial<ExcelJS.Column>[],
+    data: any[]
+  ): Promise<Buffer> {
+    const workBook = new ExcelJS.stream.xlsx.WorkbookWriter({})
+    const sheet = workBook.addWorksheet('My Worksheet')
+
+    // @ts-ignore
+    sheet.columns = headers
+    for (let i = 0; i < data.length; i += 1) {
+      const tempData = { no: i + 1, ...data[i] }
+      sheet.addRow(tempData)
+    }
+    sheet.getRow(1).font = { bold: true }
+    sheet.commit()
+
+    return new Promise((resolve, reject) => {
+      workBook
+        .commit()
+        .then(() => {
+          const { stream } = workBook as any
+          const result = stream.read()
+          resolve(result)
+        })
+        .catch((err: any) => {
+          reject(err)
+        })
+    })
+  }
+}
+
+export default ExcelHelper