rm promisify from utils

src/services/exporter.ts

@@ -1,6 +1,6 @@
-// TODO: import promisify from 'util'
+import { promisify } from 'util'
 import { getApiKey } from './api_keys';
-import { promisify, toIsoString } from '../utils';
+import {  toIsoString } from '../utils';
 import { DashboardQuery, ExportProgress, ExportStatus, ExportTask } from '../types';
 import { CSV_PATH } from '../config';
 
@@ -135,7 +135,7 @@ export class Exporter {
         progress: _.assign(this._task.progress, progress, { time }),
       };
 
-      await promisify(fs.writeFile, this._getFilePath('json'), JSON.stringify(data), 'utf8');
+      await promisify(fs.writeFile)(this._getFilePath('json'), JSON.stringify(data), 'utf8');
     } catch(err) {
       console.error(err);
       throw new Error('Can`t write file');

src/utils.ts

@@ -1,17 +1,5 @@
 import * as moment from 'moment-timezone';
 
-export async function promisify(method: (...params: any[]) => Promise<any> | void, ...params: any[]) {
-  return new Promise((resolve, reject) => {
-    method(...params, (err, result) => {
-      if(err) {
-        reject(err);
-      } else {
-        resolve(result);
-      }
-    })
-  });
-}
-
 export function toIsoString(msTimestamp: number, timeZone: string): string {
   return moment.tz(msTimestamp, timeZone).format('YYYY-MM-DD HH:mm:ssZ').replace(/:00$/, '');
 }