refactor: move Value interface to value.go

Author: tyru

dsl/types/json.go

@@ -2,22 +2,6 @@ package types
 
 import "context"
 
-// Value is JSON value
-type Value interface {
-	// Invert returns inverted value/operation.
-	// All type values are invertible.
-	// Literals like string,number,... return itself as-is.
-	// If argument type or arity is different, this returns non-nil error.
-	Invert() (Value, error)
-
-	// Eval returns a evaluated value.
-	// Literals like string,number,... return itself as-is.
-	Eval(ctx context.Context) (val Value, rollback func(), err error)
-
-	// Type returns the type of this value.
-	Type() Type
-}
-
 // ================ Null ================
 
 // Null is JSON null struct

dsl/types/value.go

@@ -0,0 +1,19 @@
+package types
+
+import "context"
+
+// Value is JSON value
+type Value interface {
+	// Invert returns inverted value/operation.
+	// All type values are invertible.
+	// Literals like string,number,... return itself as-is.
+	// If argument type or arity is different, this returns non-nil error.
+	Invert() (Value, error)
+
+	// Eval returns a evaluated value.
+	// Literals like string,number,... return itself as-is.
+	Eval(ctx context.Context) (val Value, rollback func(), err error)
+
+	// Type returns the type of this value.
+	Type() Type
+}