fix: use async fs.stat

Author: aminya

lib/main.js

@@ -2,7 +2,8 @@
 
 import { CompositeDisposable } from 'atom';
 import path from 'path';
-import fs from 'fs';
+import { promises } from 'fs';
+const { stat } = promises;
 import WorkerHelper from './workerHelper';
 
 const grammarScopes = ['source.ts', 'source.tsx'];
@@ -40,14 +41,13 @@ const TsLintPackage = {
 
     // Config subscriptions
     this.subscriptions.add(
-      atom.config.observe('linter-tslint.rulesDirectory', (dir) => {
+      atom.config.observe('linter-tslint.rulesDirectory', async (dir) => {
         if (dir && path.isAbsolute(dir)) {
-          fs.stat(dir, (err, stats) => {
-            if (stats && stats.isDirectory()) {
-              config.rulesDirectory = dir;
-              this.workerHelper.changeConfig('rulesDirectory', dir);
-            }
-          });
+          const stats = await stat(dir);
+          if (stats && stats.isDirectory()) {
+            config.rulesDirectory = dir;
+            this.workerHelper.changeConfig('rulesDirectory', dir);
+          }
         }
       }),
       atom.config.observe('linter-tslint.useLocalTslint', (use) => {

lib/worker.js

@@ -2,7 +2,8 @@
 
 /* global emit */
 
-import fs from 'fs';
+import { promises } from 'fs';
+const { stat } = promises;
 import path from 'path';
 import { getRuleUri } from 'tslint-rule-documentation';
 import ChildProcess from 'child_process';
@@ -19,17 +20,6 @@ const config = {
 let fallbackLinter;
 let requireResolve;
 
-function stat(pathname) {
-  return new Promise((resolve, reject) => {
-    fs.stat(pathname, (err, stats) => {
-      if (err) {
-        return reject(err);
-      }
-      return resolve(stats);
-    });
-  });
-}
-
 /**
  * Shim for TSLint v3 interoperability
  * @param {Function} Linter TSLint v3 linter