AngularJS providers $get method does not seem to recognize the interface specified

Hey there! I've been working on implementing a state provider in TypeScript, but I seem to be having some issues with the reference provider closure. When trying to migrate my JavaScript code to TypeScript, I encountered an error stating that the 'get' method does not exist on the 'IReferenceProvider' type. I attempted changing the interface to 'IReferenceProviderGetterInterface', and while the 'get' method worked fine, I lost access to the 'injectRef' method, which doesn't feel right. I'm pretty sure I have the interfaces set up correctly, so I'm a bit stumped at the moment. If anyone has faced this problem before and can offer some guidance, I would really appreciate it. I've tried looking up solutions online, but everything appears to be in order as far as I can tell. Here are the relevant code snippets:

export interface IReferenceProvider extends angular.IServiceProvider {
    injectRef(name: string, ref: angular.ui.IUrlRouterProvider | angular.ui.IStateProvider): void;
}

export interface IReferenceProviderGetterInterface {
    get(name: string): angular.ui.IUrlRouterProvider | angular.ui.IStateProvider;
}

class ReferenceProvider implements IReferenceProvider {
    private refs: { [key: string]: angular.ui.IUrlRouterProvider | angular.ui.IStateProvider } = {};

    $get(): IReferenceProviderGetterInterface {
        return {
            get: (name: string): angular.ui.IUrlRouterProvider | angular.ui.IStateProvider => {
                return this.refs[name];
            }
        };
    }

    injectRef(name: string, ref: angular.ui.IUrlRouterProvider | angular.ui.IStateProvider): void {
        this.refs[name] = ref;
    }
}

angular.module("app")
    .provider("refs", ReferenceProvider);
}

I am using this code as follows:

static $inject: Array<string> = ["refs"];

private $stateProvider: angular.ui.IStateProvider;

constructor(refs: IReferenceProvider) {
        this.$stateProvider = refs.get("$stateProvider");
...
}

Answer №1

The method get is not actually present on the IReferenceProvider interface; it only includes the method $get.

To achieve your goal, you must add the get method to the ReferenceProvider itself:

export interface IReferenceProvider extends angular.IServiceProvider, IReferenceProviderGetterInterface {
    injectRef(name: string, ref: angular.ui.IUrlRouterProvider | angular.ui.IStateProvider): void;
}

class ReferenceProvider implements IReferenceProvider {
    private refs: { [key: string]: angular.ui.IUrlRouterProvider | angular.ui.IStateProvider } = {};

    $get(): IReferenceProviderGetterInterface {
        return {
            get: (name: string): angular.ui.IUrlRouterProvider | angular.ui.IStateProvider => {
                return this.refs[name];
            }
        };
    }

    get: (name: string): angular.ui.IUrlRouterProvider | angular.ui.IStateProvider => {
        return this.refs[name];
    }

    injectRef(name: string, ref: angular.ui.IUrlRouterProvider | angular.ui.IStateProvider): void {
        this.refs[name] = ref;
    }
}

This modification will make the function accessible both on the service and the provider.

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