fix(spec): `Plugin.opts` is now always a table. Fixes #351

lua/lazy/core/loader.lua

@@ -234,6 +234,7 @@ end
 -- Merges super opts or runs the opts function to override opts or return new ones
 ---@param plugin LazyPlugin
 function M.opts(plugin)
+  ---@type table
   local opts = plugin._.super and M.opts(plugin._.super) or {}
   ---@type PluginOpts?
   local plugin_opts = rawget(plugin, "opts")
@@ -273,11 +274,7 @@ function M.config(plugin)
     end
     if #mods == 1 then
       fn = function()
-        local opts = M.opts(plugin)
-        if next(opts) == nil then
-          opts = nil
-        end
-        require(mods[1]).setup(opts)
+        require(mods[1]).setup(M.opts(plugin))
       end
     else
       return Util.error(

lua/lazy/core/util.lua

@@ -295,6 +295,9 @@ end
 --- Values will me merged in-place in the first left-most table. If you want the result to be in
 --- a new table, then simply pass an empty table as the first argument `vim.merge({}, ...)`
 --- Supports clearing values by setting a key to `vim.NIL`
+---@generic T
+---@param ... T
+---@return T
 function M.merge(...)
   local values = { ... }
   local ret = values[1]

tests/core/plugin_spec.lua

@@ -298,6 +298,14 @@ describe("plugin opts", function()
         spec = { { "foo/foo", config = { a = 1, b = 1 } }, { "foo/foo", config = { a = vim.NIL } } },
         opts = { b = 1 },
       },
+      {
+        spec = { { "foo/foo", config = { a = 1, b = 1 } }, { "foo/foo" } },
+        opts = { a = 1, b = 1 },
+      },
+      {
+        spec = { { "foo/foo" }, { "foo/foo" } },
+        opts = {},
+      },
     }
 
     for _, test in ipairs(tests) do