diff --git a/flake.nix b/flake.nix
index eb13b41..a31c19c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,18 +22,23 @@
           pnpm
           playwright-test
         ];
+        commonEnv = {
+          PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD = "1";
+          PLAYWRIGHT_BROWSERS_PATH = "${pkgs.playwright-driver.browsers}";
+        };
       in
       {
         devShells.default = pkgs.mkShell {
           inherit buildInputs;
           shellHook = ''
-            export PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1
-            export PLAYWRIGHT_BROWSERS_PATH="${pkgs.playwright-driver.browsers}"
+            export PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=${commonEnv.PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD}
+            export PLAYWRIGHT_BROWSERS_PATH=${commonEnv.PLAYWRIGHT_BROWSERS_PATH}
           '';
         };
 
         checks.default = pkgs.runCommand "check-env" {
           inherit buildInputs;
+          inherit (commonEnv) PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD PLAYWRIGHT_BROWSERS_PATH;
         } ''
           echo "Checking Node.js version..."
           if ! node --version | grep -q "v22"; then
@@ -43,7 +48,27 @@
 
           echo "Checking pnpm availability..."
           pnpm --version || (echo "pnpm not found" && exit 1)
-
+          
+          echo "Checking PLAYWRIGHT_BROWSERS_PATH..."
+          if [ -z "$PLAYWRIGHT_BROWSERS_PATH" ]; then
+            echo "PLAYWRIGHT_BROWSERS_PATH is not set"
+            exit 1
+          fi
+          
+          echo "Checking if PLAYWRIGHT_BROWSERS_PATH exists..."
+          if [ ! -d "$PLAYWRIGHT_BROWSERS_PATH" ]; then
+            echo "PLAYWRIGHT_BROWSERS_PATH directory does not exist"
+            exit 1
+          fi
+          
+          echo "Checking for specific browsers..."
+          for browser in chromium firefox webkit; do
+            if [ ! -d "$PLAYWRIGHT_BROWSERS_PATH/$browser"* ]; then
+              echo "$browser not found in PLAYWRIGHT_BROWSERS_PATH"
+              exit 1
+            fi
+          done
+          
           touch $out
         '';
       }