Issue with loading dynamic components in Angular 2

I am facing a strange issue with dynamic component loading in Angular. I have set up a form stepper with 5 steps, each step being a separate component that is injected when necessary.

class CreateComponent {
    // List of components to be injected
    private _ContainerContractComponent = [
        ContractCivilStatusComponent,
        ContractLegalResponsableComponent,
        ContractBulletinComponent,
        ContractPaymentComponent,
        ContractSocialSecurityComponent
    ];
    // List of variables to be injected
    private _currentStudent: StudentInterface;
    private _candidature: CandidatureInterface;
    private _childObserver: Subject<any> = new Subject();
    // My current step (numberBetween<1,5>)
    private _stepperStep: number;

    // Function for loading the contract part component
    displayContractPartComponent() {
        let componentFactory = this._componentFactoryResolver.resolveComponentFactory(
            this._ContainerContractComponent[this._stepperStep - 1]
            );
        this.dynamicComponentContainer.clear();
        let componentRef = this.dynamicComponentContainer.createComponent(componentFactory);
        componentRef.instance.candidature = this._candidature;
        componentRef.instance.student = this._currentStudent;
        componentRef.instance.childObserver = this._childObserver;
    }
}

I pass three variables (candidature, student, childObserver) to each loaded component.

Everything was working fine until this morning, when suddenly I started getting this compiler error:

Error in CreateComponent: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.

Type argument candidate 'ContractBulletinComponent' is not a valid type argument because it is not a supertype of candidate 'ContractCivilStatusComponent'.

Property '_model' is missing in type 'ContractCivilStatusComponent'.

This error message seems to change with each compilation round and even the name of the component mentioned (such as 'ContractBulletinComponent') varies.

I have been researching all morning but can't figure out where the problem might be coming from. Any help would be greatly appreciated.

Answer №1

After some troubleshooting, I've managed to find the solution to my issue. It turns out that the problem lies in how I declared my array of components:

private _ContainerContractComponent = [
    ContractCivilStatusComponent,
    ContractLegalResponsableComponent,
    ContractBulletinComponent,
    ContractPaymentComponent,
    ContractSocialSecurityComponent
];

To resolve this, I needed to specify the type Array-any like so:

private _ContainerContractComponent: Array<any> = [
  ContractCivilStatusComponent,
  ContractLegalResponsableComponent,
  ContractBulletinComponent,
  ContractPaymentComponent,
  ContractSocialSecurityComponent
];

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