playwright-driver.browsers: expose raw fontconfig file

pkgs/development/web/playwright/chromium.nix

@@ -1,15 +1,10 @@
 {
   runCommand,
   makeWrapper,
-  makeFontsConf,
+  fontconfig_file,
   chromium,
   ...
 }:
-let
-  fontconfig = makeFontsConf {
-    fontDirectories = [ ];
-  };
-in
 runCommand "playwright-chromium"
   {
     nativeBuildInputs = [
@@ -25,5 +20,5 @@ runCommand "playwright-chromium"
     # as headless nixos test vms.
     makeWrapper ${chromium}/bin/chromium $out/chrome-linux/chrome \
       --set-default SSL_CERT_FILE /etc/ssl/certs/ca-bundle.crt \
-      --set-default FONTCONFIG_FILE ${fontconfig}
+      --set-default FONTCONFIG_FILE ${fontconfig_file}
   ''

pkgs/development/web/playwright/driver.nix

@@ -217,12 +217,15 @@ let
     meta.platforms = lib.platforms.darwin;
   };
 
-  browsers-linux =
+  browsers-linux = lib.makeOverridable (
     {
       withChromium ? true,
       withFirefox ? true,
       withWebkit ? true,
       withFfmpeg ? true,
+      fontconfig_file ? makeFontsConf {
+        fontDirectories = [ ];
+      },
     }:
     let
       browsers =
@@ -242,14 +245,20 @@ let
             # TODO check platform for revisionOverrides
             "${name}-${value.revision}"
             (
-              callPackage ./${name}.nix {
-                inherit suffix system throwSystem;
-                inherit (value) revision;
-              }
+              callPackage ./${name}.nix (
+                {
+                  inherit suffix system throwSystem;
+                  inherit (value) revision;
+                }
+                // lib.optionalAttrs (name == "chromium") {
+                  inherit fontconfig_file;
+                }
+              )
             )
         ) browsers
       )
-    );
+    )
+  );
 in
 {
   playwright-core = playwright-core;