diff --git a/src/installer.ts b/src/installer.ts
index 764b1288..ea854a30 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -466,7 +466,7 @@ function translateArchToDistUrl(arch: string): string {
   }
 }
 
-export async function parseNodeVersionFile(contents: string): Promise<string> {
+export function parseNodeVersionFile(contents: string): string {
   let nodeVersion = contents.trim();
 
   if (/^v\d/.test(nodeVersion)) {
diff --git a/src/main.ts b/src/main.ts
index 2d6dc462..4f88448f 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -5,7 +5,7 @@ import * as auth from './authutil';
 import * as path from 'path';
 import {restoreCache} from './cache-restore';
 import {URL} from 'url';
-import os = require('os');
+import os from 'os';
 
 export async function run() {
   try {
@@ -76,8 +76,8 @@ export async function run() {
     core.info(
       `##[add-matcher]${path.join(matchersPath, 'eslint-compact.json')}`
     );
-  } catch (error) {
-    core.setFailed(error.message);
+  } catch (err) {
+    core.setFailed(err.message);
   }
 }