fix: alias fields in structs (#25)

Author: Emyrk

convert.go

@@ -1004,8 +1004,9 @@ func (ts *Typescript) typescriptType(ty types.Type) (parsedType, error) {
 			},
 		}, nil
 	case *types.Alias:
-		// TODO: Verify this is correct.
-		return ts.typescriptType(ty.Underlying())
+		// See https://github.com/golang/go/issues/66559
+		// Rhs will traverse all aliasing types until it finds the base type.
+		return ts.typescriptType(ty.Rhs())
 	case *types.Union:
 		allTypes := make([]bindings.ExpressionType, 0, ty.Len())
 		for i := 0; i < ty.Len(); i++ {

testdata/alias/alias.go

@@ -6,3 +6,12 @@ type AliasNested = Alias
 type Alias = Foo
 type AliasString = string
 type AliasStringSlice = []string
+
+type FooStruct struct {
+	Key string
+}
+
+type AliasStruct = FooStruct
+type AliasStructNested = AliasStruct
+type AliasStructSlice = []FooStruct
+type AliasStructNestedSlice = []AliasStructNested

testdata/alias/alias.ts

@@ -12,5 +12,26 @@ export type AliasString = string;
 // From alias/alias.go
 export type AliasStringSlice = readonly string[];
 
+// From alias/alias.go
+export interface AliasStruct {
+    readonly Key: string;
+}
+
+// From alias/alias.go
+export interface AliasStructNested {
+    readonly Key: string;
+}
+
+// From alias/alias.go
+export type AliasStructNestedSlice = readonly FooStruct[];
+
+// From alias/alias.go
+export type AliasStructSlice = readonly FooStruct[];
+
 // From alias/alias.go
 export type Foo = string;
+
+// From alias/alias.go
+export interface FooStruct {
+    readonly Key: string;
+}