CODEWITHSUNDEEP
angularjstypescript
Pranay Dutta
Pranay Dutta

Reputation: 2591

TS2409: Return type of constructor signature must be assignable to the instance type of the class

i Am having a problem in typeScript + angular , here class foo is a service which is using another service as fooService and fooServie.getUser() is returning a promise of some type

compilation is good but with this type error :TS2409: Return type of constructor signature must be assignable to the instance type of the class

Pleae help me out with the issue

module fooModule {

    export class foo {

        static $inject = ['fooService'];

        constructor(public fooService:services.fooService) {

            return fooService.getUser();
        }
    }
}

Upvotes: 0

Views: 8444

Answers (1)

basarat
basarat

Reputation: 276115

compilation is good but with this type error :TS2409: Return type of constructor signature must be assignable to the instance type of the class

The error is very clear. The return statement from the constructor return fooService.getUser(); should give an instance of the class class foo. e.g.

declare class FooService{
    getfoo():foo;
}

class foo {

    constructor(public fooService:FooService) {
        return fooService.getfoo();
    }
}

Otherwise in var f = new foo the variable f would not be of type foo.

Update

I am not sure what you intent is but hopefully this will guide you more:

module fooModule {

    export class Foo {

        static $inject = ['fooService'];

        constructor(public fooService:services.FooService) {
        }
        
        getUser():ng.IPromise<User>{
            return this.fooService.getUser();
        }
    }
    
    var foo = new Foo(); 
    foo.getUser().then(()=>{
        // complete this code here 
    });
}

Upvotes: 2

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