Do not attempt to export fields that cannot be json-encoded (#3975)

* Do not attempt to export fields that cannot be json-encoded

* update changelog w/ PR

* also skip UnsafePointers

---------

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

v2/internal/binding/binding.go

@@ -350,6 +350,14 @@ func (b *Bindings) hasExportedJSONFields(typeOf reflect.Type) bool {
 	for i := 0; i < typeOf.NumField(); i++ {
 		jsonFieldName := ""
 		f := typeOf.Field(i)
+		// function, complex, and channel types cannot be json-encoded
+		if f.Type.Kind() == reflect.Chan ||
+			f.Type.Kind() == reflect.Func ||
+			f.Type.Kind() == reflect.UnsafePointer ||
+			f.Type.Kind() == reflect.Complex128 ||
+			f.Type.Kind() == reflect.Complex64 {
+			continue
+		}
 		jsonTag, hasTag := f.Tag.Lookup("json")
 		if !hasTag && f.IsExported() {
 			return true

v2/internal/binding/binding_test/binding_notags_test.go

@@ -5,6 +5,7 @@ type NoFieldTags struct {
 	Address string
 	Zip     *string
 	Spouse  *NoFieldTags
+	NoFunc  func() string
 }
 
 func (n NoFieldTags) Get() NoFieldTags {

v2/internal/typescriptify/typescriptify.go

@@ -553,6 +553,14 @@ func (t *TypeScriptify) getFieldOptions(structType reflect.Type, field reflect.S
 
 func (t *TypeScriptify) getJSONFieldName(field reflect.StructField, isPtr bool) string {
 	jsonFieldName := ""
+	// function, complex, and channel types cannot be json-encoded
+	if field.Type.Kind() == reflect.Chan ||
+		field.Type.Kind() == reflect.Func ||
+		field.Type.Kind() == reflect.UnsafePointer ||
+		field.Type.Kind() == reflect.Complex128 ||
+		field.Type.Kind() == reflect.Complex64 {
+		return ""
+	}
 	jsonTag, hasTag := field.Tag.Lookup("json")
 	if !hasTag && field.IsExported() {
 		jsonFieldName = field.Name

website/src/pages/changelog.mdx

@@ -28,7 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed incorrect TS definition of `WindowSetSize` by @leaanthony
 - chore: fix some comments in [PR](https://github.com/wailsapp/wails/pull/3932) by @lvyaoting
 - [windows] Fixed frameless window flickering when minimizing/restoring by preventing unnecessary redraws [#3951](https://github.com/wailsapp/wails/issues/3951)
-
+- Fixed failed models.ts build due to non-json-encodable Go types [PR](https://github.com/wailsapp/wails/pull/3975) by [@pbnjay](https://github.com/pbnjay)
 
 ### Changed
 - Allow to specify macos-min-version externally. Implemented by @APshenkin in [PR](https://github.com/wailsapp/wails/pull/3756)