no bindings for interface return types

[nasoooor29]

i have a method that return an interface

// Fetcher is an interface
func (m *TestStruct) GetAllSites() []models.Fetcher {
	return m.Sites
}
type Fetcher interface {
	GetLatestEpisodes() ([]Episode, error)
	GetMetadata(link string) (*Metadata, error)
	GetEpisodeMetadata(link string) (*Chapter, error)
	SearchSeries(query string) ([]Metadata, error)
	Downloader
}
type Downloader interface {
	DownloadEpisode(ep *Episode, path string, q ...Quality) error
	DownloadSeries(a *Metadata, path string, q ...Quality) error
}

the bindings generated

export function DownloadEpisode(arg1:models.Episode,arg2:string,arg3:Array<models.Quality>):Promise<void>;

export function DownloadSeries(arg1:models.Metadata,arg2:string,arg3:Array<models.Quality>):Promise<void>;

export function GetAllSites():Promise<Array<models.Fetcher>>; // ERROR: Namespace '".../frontend/wailsjs/go/models".models' has no exported member 'Fetcher'. 

export function GetDownloaderByLink(arg1:string):Promise<models.Fetcher>; // SAME ERROR HERE

export function GetEpisodeMetadata(arg1:string):Promise<models.Episode>;

export function GetEpisodesMetadata(arg1:string):Promise<Array<models.Episode>>;

export function GetLatestEpisodes():Promise<Array<models.Episode>>;

everything is good except the Fetcher interface is not generated on

export function GetAllSites():Promise<Array<models.Fetcher>>;

i had the same issue with enums but it was solved with from the docs

EnumBind: []interface{}{
	models.AllQualities,
}

the Fetcher interface is not generated with the bindings, i tried to find a way from the docs but couldn't find it

[nasoooor29]

this is a replicate setup

new wails app

app.go

package main

import (
	"context"
)

// App struct
type App struct {
	ctx   context.Context
	Sites []Fetcher
}

func (a *App) GetSites() []Fetcher { // error will be here but in ts 
	return a.Sites
}

type Episode struct {
	Index int
	Name  string
	URL   string
}
type FetchManager struct {
	Sites []Fetcher
}

type Fetcher interface {
	SearchSeries(query string) (Episode, error)
	Downloader
}
type Downloader interface {
	DownloadEpisode(ep *Episode, path string) error
}

type Site1 struct{}
type Site2 struct{}

func (s *Site1) SearchSeries(query string) (Episode, error) {
	return Episode{}, nil
}

func (s *Site1) DownloadEpisode(ep *Episode, path string) error {
	return nil
}

func (s *Site2) SearchSeries(query string) (Episode, error) {
	return Episode{}, nil
}

func (s *Site2) DownloadEpisode(ep *Episode, path string) error {
	return nil
}

// NewApp creates a new App application struct
func NewApp() *App {
	return &App{
		Sites: []Fetcher{
			&Site1{},
			&Site2{},
		},
	}
}

// startup is called when the app starts. The context is saved
// so we can call the runtime methods
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx
}

[nasoooor29]

another note
when you invoke the method that have the interface
you will get

FAT | json: unsupported type: func(*http.Request, []*http.Request) error

although i don't mind alot changing my app architechture but i prefer not to change it too much, or maybe im doing something wrong, i want someone to tell me how to do it the "wails" way

[leaanthony]

Please open an issue with all the details 👍
As an aside, the "Go way" is to not return interfaces: accept interfaces, return structs.

[nasoooor29]

i researched this a bit it may be bigger problem than what i thought because typescriptify, tygo and the other go to ts converters don't convert go interfaces to ts.
and for the "Go way", "wails way" or whatever this is i think it's impossible to group bunch of structs doing the same behaviour without making something like this

// Fetcher is an interface and interface don't get converted
Sites: []Fetcher{
			&Site1{},
			&Site2{},
		},

or maybe i don't know any other way.

[nasoooor29]

@leaanthony

Hey,

Got a quick question about Wails v3. When I tried running it, I saw this warning:

 Wails (v3.0.0-dev)  Generate Bindings 
 WARNING  C:\Users\Nasoooor\Documents\witty\main.go:37:16: ignoring interface service type witty/models.AnimeFetcher
 INFO  Processed: 412 Packages, 1 Service, 1 Method, 0 Enums, 0 Models in 1.651015s.
 INFO  Output directory: C:\Users\Nasoooor\Documents\witty\frontend\bindings
 WARNING  1 warning emitted

It's like it knew what I was doing and gave me a heads-up (about passing an interface), which is cool. I think it'd be easier to chat about this on Discord instead of opening a whole issue.

Only problem is, my Discord account got banned before (totally my bad, I got hacked and it spammed everyone). It'd be awesome if I could get back in, but it's fine if i didn't, I get it!
this is my discord user and userid if you wanted to unban me
user: nasoooor
userid: 643088598438117407
profile pic: