i change toaster version that was my problem

[mokhtaarr]

          > i have same problem and use npm install ngx-toastr --save --force .. and this error come to me Error: ../node_modules/ngx-toastr/toastr/toast-injector.d.ts:47:5 - error TS2416: Property 'get' in type 'ToastInjector' is not assignable to the same property in base type 'Injector'. Type '(token: any, notFoundValue?: T | undefined, flags?: InjectFlags | undefined) => T | ToastPackage' is not assignable to type '{ (token: ProviderToken, notFoundValue: undefined, options: InjectOptions & { optional?: false | undefined; }): T; (token: ProviderToken, notFoundValue: null | undefined, options: InjectOptions): T | null; (token: ProviderToken<...>, notFoundValue?: T | undefined, options?: InjectOptions | ... 1 more ...'. Types of parameters 'flags' and 'options' are incompatible. Type 'InjectOptions & { optional?: false | undefined; }' is not assignable to type 'InjectFlags | undefined'.

I am having this exact issue. Have you found a solution?

Originally posted by @dlp140 in #915 (comment)

[Rabeb1998]

Pour résoudre cette erreur, vous pouvez accéder au fichier "node_modules/ngx-toastr/toastr/toast-injector.d.ts" et essayer de modifier la signature de la méthode 'get' dans la classe 'ToastInjector' pour correspondante à celle de la classe de base 'Injecteur'. Voici comment vous pouvez le faire : get(token: any, notFoundValue?: T | undefined): T | ToastPackage ;

[edobasky]

adding "skipLibCheck":true in tsconfig.json worked for me