[Error] Firebase 5.0.0: Generic type 'Observer<T>' requires 1 type argument(s).

[paulstelzer]

Issue: Generic type 'Observer' requires 1 type argument(s).

Observer types in Firebase 5.0.0 not fixed on all positions. In commit #770 the interface Observer is now "export interface Observer {...}", but in "/packages/auth-types/index.d.ts" at line 271 and 276 it's still the old one. The same at "/packages/storage-types/index.d.ts" line 80.

Environment

• Operating System version: Windows 10
• Firebase SDK version: 5.0.0

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[nayfin]

I'm seeing this too. Using "angularfire2": "5.0.0-rc.8.", "firebase": "4.12.1", "@angular/core": "6.0.2". I started getting the following after upgraging to Angular 6.

ERROR in node_modules/@firebase/auth-types/index.d.ts(255,21): error TS2314: Generic type 'Observer<T>' requires 1 type argument(s).
node_modules/@firebase/auth-types/index.d.ts(260,21): error TS2314: Generic type 'Observer<T>'
requires 1 type argument(s).
node_modules/@firebase/messaging-types/index.d.ts(25,38): error TS2314: Generic type 'Observer<T>' requires 1 type argument(s).
node_modules/@firebase/messaging-types/index.d.ts(30,38): error TS2314: Generic type 'Observer<T>' requires 1 type argument(s).
node_modules/@firebase/storage-types/index.d.ts(77,22): error TS2314: Generic type 'Observer<T>' requires 1 type argument(s).

running npm install --save firebase@next gives me new errors but they are ones I can control.

[paulstelzer]

@nayfin use the latest versions of angularfire2 and firebase. then everything should work again

[sreekanth-karini]

Update typescript, npm install typescript@2.3 --save will fix the error.