From 96c9775a5f109565595d8f2995ade4d16eb64a42 Mon Sep 17 00:00:00 2001
From: Matt Sturgeon <matt@sturgeon.me.uk>
Date: Fri, 3 Oct 2025 18:56:36 +0100
Subject: [PATCH] plugins/lsp/volar: handle null package with ts_ls integration

The ts_ls integration needs to call `getBin cfg.package`, so the package
cannot be null.

Adds an assertion.
---
 plugins/lsp/language-servers/default.nix | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/plugins/lsp/language-servers/default.nix b/plugins/lsp/language-servers/default.nix
index b3b4a458..302a585c 100644
--- a/plugins/lsp/language-servers/default.nix
+++ b/plugins/lsp/language-servers/default.nix
@@ -162,12 +162,16 @@ let
           example = false;
         };
       };
-      extraConfig = cfg: {
+      extraConfig = cfg: opts: {
+        assertions = lib.nixvim.mkAssertions "plugins.lsp.servers.volar" {
+          assertion = cfg.tslsIntegration -> (cfg.package != null);
+          message = "When `${opts.tslsIntegration}` is enabled, `${opts.package}` must not be null.";
+        };
         plugins.lsp.servers.ts_ls = lib.mkIf (cfg.enable && cfg.tslsIntegration) {
           filetypes = [ "vue" ];
           extraOptions = {
             init_options = {
-              plugins = [
+              plugins = lib.mkIf (cfg.package != null) [
                 {
                   name = "@vue/typescript-plugin";
                   location = "${lib.getBin cfg.package}/lib/language-tools/packages/language-server";