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Это ошибки, которые я получил после обновления npm, из-за ошибки отключения [WDS]! ошибка в консоли Mozilla Firefox. Это ошибка, которую должны решить опытные разработчики.

 
5 import firebase from 'firebase/app';
         ~~~~~~~~

  node_modules/firebase/index.d.ts:9710:1
    9710 export = firebase;
         ~~~~~~~~~~~~~~~~~~
    This module is declared with using 'export =', and can only be used with a default import when using the
'allowSyntheticDefaultImports' flag.
node_modules/@angular/fire/firestore/collection-group/collection-group.d.ts:2:8 - error TS1259: Module '"D:/apps/angularfs3/node_modules/firebase/index"' can only be default-imported using the 'allowSyntheticDefaultImports' flag

2 import firebase from 'firebase/app';
         ~~~~~~~~

  node_modules/firebase/index.d.ts:9710:1
    9710 export = firebase;
         ~~~~~~~~~~~~~~~~~~
    This module is declared with using 'export =', and can only be used with a default import when using the
'allowSyntheticDefaultImports' flag.
node_modules/@angular/fire/firestore/firestore.d.ts:9:8 - error TS1259: Module '"D:/apps/angularfs3/node_modules/firebase/index"' can only be default-imported using the 'allowSyntheticDefaultImports' flag

9 import firebase from 'firebase/app';
         ~~~~~~~~

  node_modules/firebase/index.d.ts:9710:1
    9710 export = firebase;
         ~~~~~~~~~~~~~~~~~~
    This module is declared with using 'export =', and can only be used with a default import when using the
'allowSyntheticDefaultImports' flag.
node_modules/@angular/fire/auth/auth.d.ts:4:8 - error TS1259: Module '"D:/apps/angularfs3/node_modules/firebase/index"' can only be default-imported using the 'allowSyntheticDefaultImports' flag

4 import firebase from 'firebase/app';
         ~~~~~~~~

  node_modules/firebase/index.d.ts:9710:1
    9710 export = firebase;
         ~~~~~~~~~~~~~~~~~~
    This module is declared with using 'export =', and can only be used with a default import when using the
'allowSyntheticDefaultImports' flag.
node_modules/@angular/fire/auth/auth.d.ts:12:14 - error TS2411: Property 'authState' of type 'Observable<any>' is not assignable to string index type 'Promise<any> amp; ((...args: unknown[]) => Promise<any>) amp; ((...args:
unknown[]) => any)'.

12     readonly authState: Observable<firebase.User | null>;
                ~~~~~~~~~
node_modules/@angular/fire/auth/auth.d.ts:16:14 - error TS2411: Property 'idToken' of type 'Observable<string>' is not assignable to string index type 'Promise<any> amp; ((...args: unknown[]) => Promise<any>) amp; ((...args: unknown[]) => any)'.

16     readonly idToken: Observable<string | null>;
                ~~~~~~~
node_modules/@angular/fire/auth/auth.d.ts:20:14 - error TS2411: Property 'user' of type 'Observable<any>' is
not assignable to string index type 'Promise<any> amp; ((...args: unknown[]) => Promise<any>) amp; ((...args: unknown[]) => any)'.

  

Вам нужно добавить "allowSyntheticDefaultImports": true в свой tsconfig.json ( compilerOptions раздел).

• https://www.typescriptlang.org/docs/handbook/compiler-options.html