improve to show apis

xmake/core/sandbox/modules/import/lib/luajit/bcsave.lua

@@ -44,4 +44,7 @@ function main(luafile, bcfile, opt)
         raise(errors)
     end
 end
-return main
+
+if xmake._LUAJIT then
+    return main
+end

xmake/core/sandbox/modules/import/lib/luajit/bit.lua

@@ -18,5 +18,6 @@
 -- @file        bit.lua
 --
 
--- return module
-return require("bit")
+if xmake._LUAJIT then
+    return require("bit")
+end

xmake/core/sandbox/modules/import/lib/luajit/ffi.lua

@@ -18,5 +18,6 @@
 -- @file        ffi.lua
 --
 
--- return module
-return require("ffi")
+if xmake._LUAJIT then
+    return require("ffi")
+end

xmake/core/sandbox/modules/import/lib/luajit/jit.lua

@@ -18,5 +18,6 @@
 -- @file        jit.lua
 --
 
--- return module
-return require("jit")
+if xmake._LUAJIT then
+    return require("jit")
+end

xmake/plugins/show/lists/apis.lua

@@ -284,12 +284,14 @@ function script_extension_module_apis()
                 end
                 modulename = modulename:gsub("/", "."):gsub("%.lua", "")
                 local instance = import(modulename, {try = true, anonymous = true})
-                if _is_callable(instance) then
-                    table.insert(result, modulename)
-                elseif type(instance) == "table" then
-                    for k, v in pairs(instance) do
-                        if not k:startswith("_") and type(v) == "function" then
-                            table.insert(result, modulename .. "." .. k)
+                if instance then
+                    if _is_callable(instance) then
+                        table.insert(result, modulename)
+                    elseif type(instance) == "table" then
+                        for k, v in pairs(instance) do
+                            if not k:startswith("_") and type(v) == "function" then
+                                table.insert(result, modulename .. "." .. k)
+                            end
                         end
                     end
                 end