Al intentar 'servir ng' después de configurar angular con base de fuego, recibí el error. Aunque busqué en Google este mensaje de error pero no pude encontrar nada. En el mensaje de error, este problema está relacionado con la propia biblioteca.

 user@user-MacBookPro post % ng serve 10% building 3/3 modules 0 activeℹ ｢wds｣: Project is running at http://localhost:4200/webpack-dev-server/ ℹ ｢wds｣: webpack output is served from / ℹ ｢wds｣: 404s will fallback to //index.html chunk {main} main.js, main.js.map (main) 2.15 kB [initial] [rendered] chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 127 kB [initial] [rendered] chunk {runtime} runtime.js, runtime.js.map (runtime) 6.15 kB [entry] [rendered] chunk {styles} styles.js, styles.js.map (styles) 9.78 kB [initial] [rendered] chunk {vendor} vendor.js, vendor.js.map (vendor) 340 kB [initial] [rendered] Date: 2020-02-10T01:58:36.888Z - Hash: 259e06990402b2940abe - Time: 3542ms ERROR in node_modules/@angular/fire/angularfire2.d.ts:37:49 - error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any) => any'. Type 'T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. Type 'T[T[keyof T] extends Function ? keyof T : never]' is not assignable to type '(...args: any) => any'. Type 'T[keyof T]' is not assignable to type '(...args: any) => any'. Type 'T[string] | T[number] | T[symbol]' is not assignable to type '(...args: any) => any'. Type 'T[string]' is not assignable to type '(...args: any) => any'. 37 [K in FunctionPropertyNames<T>]: ReturnType<T[K]> extends Promise<any> ? K : never; ~~~~ node_modules/@angular/fire/angularfire2.d.ts:40:49 - error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any) => any'. Type 'T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. Type 'T[T[keyof T] extends Function ? keyof T : never]' is not assignable to type '(...args: any) => any'. Type 'T[keyof T]' is not assignable to type '(...args: any) => any'. Type 'T[string] | T[number] | T[symbol]' is not assignable to type '(...args: any) => any'. Type 'T[string]' is not assignable to type '(...args: any) => any'. 40 [K in FunctionPropertyNames<T>]: ReturnType<T[K]> extends Promise<any> ? never : K; ~~~~ node_modules/@angular/fire/angularfire2.d.ts:48:78 - error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any) => any'. Type 'T[{ [K in { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]: ReturnType<T[K]> extends Promise<any> ? never : K; }[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]]' is not assignable to type '(...args: any) => any'. Type 'T[ReturnType<T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]> extends Promise<any> ? never : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. Type 'T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. Type 'T[T[keyof T] extends Function ? keyof T : never]' is not assignable to type '(...args: any) => any'. Type 'T[keyof T]' is not assignable to type '(...args: any) => any'. Type 'T[string] | T[number] | T[symbol]' is not assignable to type '(...args: any) => any'. Type 'T[string]' is not assignable to type '(...args: any) => any'. 48 [K in NonPromiseReturningFunctionPropertyNames<T>]: (...args: Parameters<T[K]>) => Promise<ReturnType<T[K]>>; ~~~~ node_modules/@angular/fire/angularfire2.d.ts:48:107 - error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any) => any'. Type 'T[{ [K in { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]: ReturnType<T[K]> extends Promise<any> ? never : K; }[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]]' is not assignable to type '(...args: any) => any'. Type 'T[ReturnType<T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]> extends Promise<any> ? never : { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. Type 'T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. Type 'T[T[keyof T] extends Function ? keyof T : never]' is not assignable to type '(...args: any) => any'. Type 'T[keyof T]' is not assignable to type '(...args: any) => any'. Type 'T[string] | T[number] | T[symbol]' is not assignable to type '(...args: any) => any'. Type 'T[string]' is not assignable to type '(...args: any) => any'. 48 [K in NonPromiseReturningFunctionPropertyNames<T>]: (...args: Parameters<T[K]>) => Promise<ReturnType<T[K]>>; ~~~~ node_modules/@angular/fire/angularfire2.d.ts:50:75 - error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any) => any'. Type 'T[{ [K in { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]: ReturnType<T[K]> extends Promise<any> ? K : never; }[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]]' is not assignable to type '(...args: any) => any'. Type 'T[ReturnType<T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]> extends Promise<any> ? { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T] : never]' is not assignable to type '(...args: any) => any'. Type 'T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. 50 [K in PromiseReturningFunctionPropertyNames<T>]: (...args: Parameters<T[K]>) => ReturnType<T[K]>; ~~~~ node_modules/@angular/fire/angularfire2.d.ts:50:96 - error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any) => any'. Type 'T[{ [K in { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]: ReturnType<T[K]> extends Promise<any> ? K : never; }[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]]' is not assignable to type '(...args: any) => any'. Type 'T[ReturnType<T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]> extends Promise<any> ? { [K in keyof T]: T[K] extends Function ? K : never; }[keyof T] : never]' is not assignable to type '(...args: any) => any'. Type 'T[{ [K in keyof T]: T[K] extends Function ? K : never; }[keyof T]]' is not assignable to type '(...args: any) => any'. 50 [K in PromiseReturningFunctionPropertyNames<T>]: (...args: Parameters<T[K]>) => ReturnType<T[K]>; ~~~~ ** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ ** ℹ ｢wdm｣: Failed to compile.

Este es un archivo package.json. Este proyecto está basado en Angular8, firebase versión 6.

 { "name": "post", "version": "0.0.0", "scripts": { "ng": "ng", "start": "ng serve", "build": "ng build", "test": "ng test", "lint": "ng lint", "e2e": "ng e2e" }, "private": true, "dependencies": { "@angular/animations": "~8.2.14", "@angular/common": "~8.2.14", "@angular/compiler": "~8.2.14", "@angular/core": "~8.2.14", "@angular/fire": "^6.0.0-rc.1", "@angular/forms": "~8.2.14", "@angular/platform-browser": "~8.2.14", "@angular/platform-browser-dynamic": "~8.2.14", "@angular/router": "~8.2.14", "firebase": "^7.8.1", "rxjs": "~6.4.0", "tslib": "^1.10.0", "zone.js": "~0.9.1" }, "devDependencies": { "@angular-devkit/build-angular": "~0.803.24", "@angular/cli": "~8.3.24", "@angular/compiler-cli": "~8.2.14", "@angular/language-service": "~8.2.14", "@types/node": "~8.9.4", "@types/jasmine": "~3.3.8", "@types/jasminewd2": "~2.0.3", "codelyzer": "^5.0.0", "jasmine-core": "~3.4.0", "jasmine-spec-reporter": "~4.2.1", "karma": "~4.1.0", "karma-chrome-launcher": "~2.2.0", "karma-coverage-istanbul-reporter": "~2.0.1", "karma-jasmine": "~2.0.1", "karma-jasmine-html-reporter": "^1.4.0", "protractor": "~5.4.0", "ts-node": "~7.0.0", "tslint": "~5.15.0", "typescript": "~3.5.3", "@angular-devkit/architect": "^0.900.0-0 || ^0.900.0", "firebase-tools": "^7.12.1", "fuzzy": "^0.1.3", "inquirer": "^6.2.2", "inquirer-autocomplete-prompt": "^1.0.1" } }

 import { BrowserModule } from '@angular/platform-browser'; import { NgModule } from '@angular/core'; import { AppRoutingModule } from './app-routing.module'; import { AppComponent } from './app.component'; import { environment } from 'src/environments/environment'; //angular-fire import { AngularFireModule } from "@angular/fire"; import { AngularFirestoreModule } from "@angular/fire/firestore"; // in version 6, StorageBucket changes to BUCKET import { AngularFireStorageModule, BUCKET } from "@angular/fire/storage"; // component list import { AddpostComponent } from "../app/addpost/addpost.component"; import { MainComponent } from "../app/main/main.component"; import { PostComponent } from "../app/post/post.component"; // forms module for AddpostComponent import { FormsModule, ReactiveFormsModule } from "@angular/forms"; import {ServiceService } from "./service.service"; @NgModule({ declarations: [ AppComponent, AddpostComponent, MainComponent, PostComponent ], imports: [ BrowserModule, AppRoutingModule, AngularFireModule.initializeApp(environment.firebaseConfig), AngularFirestoreModule, AngularFireStorageModule, FormsModule, ReactiveFormsModule ], providers: [{ provide: BUCKET, useValue: 'gs://angular-firebase-rxjs.appspot.com' }, ServiceService], bootstrap: [AppComponent] }) export class AppModule { }