entc/gen: initial work for multi-schema migration using atlasgo.io (#3821)

examples/start/ent/client.go

@@ -39,9 +39,7 @@ type Client struct {
 
 // NewClient creates a new client configured with the given options.
 func NewClient(opts ...Option) *Client {
-	cfg := config{log: log.Println, hooks: &hooks{}, inters: &inters{}}
-	cfg.options(opts...)
-	client := &Client{config: cfg}
+	client := &Client{config: newConfig(opts...)}
 	client.init()
 	return client
 }
@@ -71,6 +69,13 @@ type (
 	Option func(*config)
 )
 
+// newConfig creates a new config for the client.
+func newConfig(opts ...Option) config {
+	cfg := config{log: log.Println, hooks: &hooks{}, inters: &inters{}}
+	cfg.options(opts...)
+	return cfg
+}
+
 // options applies the options on the config object.
 func (c *config) options(opts ...Option) {
 	for _, opt := range opts {