fix(vue_ls): make tsserver handler more resilient

Problem:
The current `on_init` of `vue_ls` requiers `vtsls` or `ts_ls` to already be
attached, which is not always guaranteed.

Solution:
Add a retry mechanism that reruns the logic for some time to give the
other ls a chance to catch up.

Author: Jak-Ch-ll

lsp/vue_ls.lua

@@ -24,12 +24,25 @@ return {
   filetypes = { 'vue' },
   root_markers = { 'package.json' },
   on_init = function(client)
-    client.handlers['tsserver/request'] = function(_, result, context)
+    local retries = 0
+
+    ---@param _ lsp.ResponseError
+    ---@param result any
+    ---@param context lsp.HandlerContext
+    local function typescriptHandler(_, result, context)
       local ts_client = vim.lsp.get_clients({ bufnr = context.bufnr, name = 'ts_ls' })[1]
         or vim.lsp.get_clients({ bufnr = context.bufnr, name = 'vtsls' })[1]
 
       if not ts_client then
-        vim.notify('Could not find `ts_ls` or `vtsls` lsp client, required by `vue_ls`.', vim.log.levels.ERROR)
+        -- there can sometimes be a short delay until `ts_ls`/`vtsls` are attached so we retry for a few times until it is ready
+        if retries <= 10 then
+          retries = retries + 1
+          vim.defer_fn(function()
+            typescriptHandler(_, result, context)
+          end, 100)
+        else
+          vim.notify('Could not find `ts_ls` or `vtsls` lsp client, required by `vue_ls`.', vim.log.levels.ERROR)
+        end
         return
       end
 
@@ -48,5 +61,7 @@ return {
         client:notify('tsserver/response', response_data)
       end)
     end
+
+    client.handlers['tsserver/request'] = typescriptHandler
   end,
 }