Typescript generation of Generic Struct

[aaronflorey]

Description

When using a generic struct as a return type of a public function, it generates invalid typescript

To Reproduce

Go

type Collection[T interface{}] struct {
	Data []T `json:"data"`
}

type Item struct {
	Id int `json:"id"`
}

func (a *App) GetTestData() Collection[Item] {

	var result Collection[Item]

	return result
}

# OR

type ItemCollection = Collection[Item]

func (a *App) GetTestData() ItemCollection {

	var result ItemCollection

	return result
}

model.ts

	export class Collection[changeme/backend.Item] {
	    data: Item[];
	
	    static createFrom(source: any = {}) {
	        return new Collection[changeme/backend.Item](source);
	    }
	
	    constructor(source: any = {}) {
	        if ('string' === typeof source) source = JSON.parse(source);
	        this.data = this.convertValues(source["data"], Item);
	    }
	
		convertValues(a: any, classs: any, asMap: boolean = false): any {
		    if (!a) {
		        return a;
		    }
		    if (a.slice) {
		        return (a as any[]).map(elem => this.convertValues(elem, classs));
		    } else if ("object" === typeof a) {
		        if (asMap) {
		            for (const key of Object.keys(a)) {
		                a[key] = new classs(a[key]);
		            }
		            return a;
		        }
		        return new classs(a);
		    }
		    return a;
		}
	}

Expected behaviour

It should generate a new generic type and use that instead

Screenshots

No response

Attempted Fixes

The only way to get around it is to return interface{} or something else that doesn't require generics.

I tried this package and it was able to successfully generate the generics. Could possibly utilise that. github.com/gzuidhof/tygo

System Details

Scanning system - Please wait (this may take a long time)...Done.

# System

OS           | MacOS   
Version      | 12.3    
ID           | 21E230  
Go Version   | go1.19.5
Platform     | darwin  
Architecture | arm64   

# Wails

Version | v2.3.1

# Dependencies

Dependency                | Package Name | Status    | Version
Xcode command line tools  | N/A          | Installed | 2395   
npm                       | N/A          | Installed | 8.12.1 
*Xcode                    | N/A          | Available |        
*upx                      | N/A          | Available |        
*nsis                     | N/A          | Available |        
* - Optional Dependency

# Diagnosis

Your system is ready for Wails development!

Additional context

No response

[leaanthony]

Tygo looks great. I'll look to see if we could just use that instead.

[KiddoV]

Any update on this?

[leaanthony]

Did you try using tygo to generate?

[KiddoV]

I haven't try that. We can wails generate module with tygo?

It looks promising. With this, I can match all of my Golang types with TS.

I think we should add a document for using Wails with Tygo.

[leaanthony]

This won't be supported in v2 but will keep this open as a TODO for v3.