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I am trying to implement nativescript-oauth2 with IdentityServer 4 so I am trying to implement a custom provider but I am getting a compilation error as follows:

Property 'providerType' in type 'TnsOaProviderMyProvider' is not
assignable to the same property in base type 'TnsOaProvider'. Type
'"MyProvider"' is not assignable to type 'TnsOaProviderType'

import TnsOaProvider, TnsOaProviderOptions, OpenIdSupportFull, TnsOaProviderType from "nativescript-oauth2/providers/providers";
import ITnsOAuthTokenResult from "nativescript-oauth2";

export declare type ProviderTypeMyProvider = "MyProvider";
export interface TnsOaProviderOptionsMyProvider extends TnsOaProviderMyProvider 

export declare class TnsOaProviderMyProvider implements TnsOaProvider 
 options: TnsOaProviderOptions;
 openIdSupport: OpenIdSupportFull;
 providerType: ProviderTypeMyProvider;
 authority: string;
 tokenEndpointBase: string;
 authorizeEndpoint: string;
 tokenEndpoint: string;
 cookieDomains: string;
 constructor(options: TnsOaProviderOptionsMyProvider);
 parseTokenResult(jsonData: any): ITnsOAuthTokenResult;

Any idea how to extend the TnsOaProviderType which is defined as follows:

export type TnsOaProviderType =
 | ProviderTypeFacebook
 | ProviderTypeGoogle
 | ProviderTypeMicrosoft
 | ProviderTypeLinkedIn;

There seems to be something wrong with your hierarchy.

You are extending TnsOaProviderOptionsMyProvider from TnsOaProviderMyProvider but you want to pass TnsOaProviderOptionsMyProvider as parameter to TnsOaProviderMyProvider itself?

Please double check if you have named them same by mistake.