diff --git a/bin/packages/lint-staged-typecheck.js b/bin/packages/lint-staged-typecheck.js
index 30c513ec983c5..7b7eb7b846bfb 100644
--- a/bin/packages/lint-staged-typecheck.js
+++ b/bin/packages/lint-staged-typecheck.js
@@ -1,7 +1,6 @@
 /**
  * External dependencies
  */
-const _ = require( 'lodash' );
 const path = require( 'path' );
 const fs = require( 'fs' );
 const execa = require( 'execa' );
@@ -18,12 +17,14 @@ const tscPath = path.join( repoRoot, 'node_modules', '.bin', 'tsc' );
 const changedFiles = process.argv.slice( 2 );
 
 // Transform changed files to package directories containing tsconfig.json.
-const changedPackages = _.uniq(
-	changedFiles.map( ( fullPath ) => {
-		const relativePath = path.relative( repoRoot, fullPath );
-		return path.join( ...relativePath.split( path.sep ).slice( 0, 2 ) );
-	} )
-).filter( ( packageRoot ) =>
+const changedPackages = [
+	...new Set(
+		changedFiles.map( ( fullPath ) => {
+			const relativePath = path.relative( repoRoot, fullPath );
+			return path.join( ...relativePath.split( path.sep ).slice( 0, 2 ) );
+		} )
+	),
+].filter( ( packageRoot ) =>
 	fs.existsSync( path.join( packageRoot, 'tsconfig.json' ) )
 );