diff --git a/.eslintrc.yml b/.eslintrc.yml
index 007ec31..3a56377 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -119,7 +119,11 @@ rules:
   import/exports-last: off
   import/no-duplicates: error
   import/no-namespace: error
-  import/extensions: [error, never] # TODO: switch to ignorePackages
+  import/extensions:
+    - error
+    - ignorePackages
+    - ts: never # TODO: remove once TS supports extensions
+      js: never # TODO: remove
   import/order: [error, { newlines-between: always-and-inside-groups }]
   import/newline-after-import: error
   import/prefer-default-export: off
diff --git a/resources/utils.js b/resources/utils.js
index c43a56a..253212c 100644
--- a/resources/utils.js
+++ b/resources/utils.js
@@ -2,6 +2,16 @@
 
 const fs = require('fs');
 const path = require('path');
+const childProcess = require('child_process');
+
+function exec(command, options) {
+  const output = childProcess.execSync(command, {
+    maxBuffer: 10 * 1024 * 1024, // 10MB
+    encoding: 'utf-8',
+    ...options,
+  });
+  return output && output.trimEnd();
+}
 
 function readdirRecursive(dirPath, opts = {}) {
   const { ignoreDir } = opts;
@@ -71,6 +81,7 @@ function showDirStats(dirPath) {
 }
 
 module.exports = {
+  exec,
   readdirRecursive,
   showDirStats,
 };