feature: use async/await instead of promises

config/daemon/zcashd-child-process.js

@@ -5,6 +5,7 @@ import processExists from 'process-exists';
 /* eslint-disable-next-line import/no-extraneous-dependencies */
 import isDev from 'electron-is-dev';
 import type { ChildProcess } from 'child_process';
+import eres from 'eres';
 
 import getBinariesPath from './get-binaries-path';
 import getOsFolder from './get-os-folder';
@@ -14,17 +15,25 @@ import log from './logger';
 
 const getDaemonOptions = () => (isDev ? ['-daemon', '-testnet'] : ['-daemon']);
 
-const runDaemon: () => Promise<?ChildProcess> = () => new Promise((resolve, reject) => {
+const runDaemon: () => Promise<?ChildProcess> = () => new Promise(async (resolve, reject) => {
   const processName = path.join(getBinariesPath(), getOsFolder(), getDaemonName());
 
-  fetchParams()
-    .then(() => {
+  const [err] = await eres(fetchParams());
+
+  if (err) {
+    log('Something went wrong fetching params: ', err);
+    return reject(new Error(err));
+  }
+
   log('Fetch Params finished!');
-      processExists(processName).then((isRunning) => {
+
+  const [, isRunning] = await eres(processExists(processName));
+
   if (isRunning) {
     log('Already is running!');
-          resolve();
-        } else {
+    return resolve();
+  }
+
   const childProcess = cp.spawn(processName, getDaemonOptions());
 
   childProcess.stdout.on('data', (data) => {
@@ -38,12 +47,6 @@ const runDaemon: () => Promise<?ChildProcess> = () => new Promise((resolve, reje
   });
 
   childProcess.on('error', reject);
-        }
-      });
-    })
-    .catch((err) => {
-      log('Something went wrong fetching params: ', err);
-    });
 });
 
 export default runDaemon;

config/electron.js

@@ -1,4 +1,6 @@
 // @flow
+import '@babel/polyfill';
+
 import path from 'path';
 
 /* eslint-disable import/no-extraneous-dependencies */
@@ -7,6 +9,7 @@ import { autoUpdater } from 'electron-updater';
 import isDev from 'electron-is-dev';
 /* eslint-enable import/no-extraneous-dependencies */
 import type { BrowserWindow as BrowserWindowType } from 'electron';
+import eres from 'eres';
 import { registerDebugShortcut } from '../utils/debug-shortcut';
 import runDaemon from './daemon/zcashd-child-process';
 import zcashLog from './daemon/logger';
@@ -63,15 +66,14 @@ const createWindow = () => {
   exports.app = app;
 };
 
-app.on('ready', () => {
+/* eslint-disable-next-line consistent-return */
+app.on('ready', async () => {
   createWindow();
-  runDaemon()
-    .then((proc) => {
-      if (proc) {
+  const [err, proc] = await eres(runDaemon());
+
+  if (err || !proc) return zcashLog(err);
+
   zcashDaemon = proc;
-      }
-    })
-    .catch(zcashLog);
 });
 app.on('activate', () => {
   if (mainWindow === null) createWindow();
@@ -80,7 +82,5 @@ app.on('window-all-closed', () => {
   if (process.platform !== 'darwin') app.quit();
 });
 app.on('before-quit', () => {
-  if (zcashDaemon) {
-    zcashDaemon.kill('SIGINT');
-  }
+  if (zcashDaemon) zcashDaemon.kill('SIGINT');
 });