Merge pull request #61 from tyler-proofserve-com/extends

add `extends` configuration variable

README.md

@@ -162,6 +162,10 @@ packages:
     # in the output.
     exclude_files:
       - "private_stuff.go"
+
+    # Package that the generates Typescript types should extend. This is useful when
+    # attaching your types to a generic ORM.
+    extends: "SomeType"
 ```
 
 See also the source file [tygo/config.go](./tygo/config.go).

tygo/config.go

@@ -51,6 +51,9 @@ type PackageConfig struct {
 	// If "none" is supplied, no comments are preserved.
 	PreserveComments string `yaml:"preserve_comments"`
 
+	// Default interface for Typescript-generated interfaces to extend.
+	Extends string `yaml:"extends"`
+
 	// Set the optional type (null or undefined).
 	// Supported values: "default", "undefined" (same as "default"), "" (same as "default"), "null".
 	// Default is "undefined".

tygo/write_toplevel.go

@@ -113,6 +113,10 @@ func (g *PackageGenerator) writeTypeSpec(
 	if isStruct {
 		s.WriteString("export interface ")
 		s.WriteString(ts.Name.Name)
+		if g.conf.Extends != "" {
+			s.WriteString(" extends ")
+			s.WriteString(g.conf.Extends)
+		}
 
 		if ts.TypeParams != nil {
 			g.writeTypeParamsFields(s, ts.TypeParams.List)