node.js - Angular 7 : can't find module. 无法解析 'underscore'

Question

我正在开发 Angular 7 项目。我尝试安装

 npm install --save @types/underscore

我收到以下错误:

npm WARN @agm/core@1.0.0-beta.5 requires a peer of @angular/common@^5.0.0 || ^6.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @agm/core@1.0.0-beta.5 requires a peer of @angular/core@^5.0.0 || ^6.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @angular/cdk@6.4.7 requires a peer of @angular/core@>=6.0.0-beta.0 <7.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @angular/cdk@6.4.7 requires a peer of @angular/common@>=6.0.0-beta.0 <7.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @angular/material@6.4.7 requires a peer of @angular/core@>=6.0.0-beta.0 <7.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @angular/material@6.4.7 requires a peer of @angular/common@>=6.0.0-beta.0 <7.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @angular/platform-server@6.1.10 requires a peer of @angular/animations@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/platform-server@6.1.10 requires a peer of @angular/common@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/platform-server@6.1.10 requires a peer of @angular/compiler@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/platform-server@6.1.10 requires a peer of @angular/core@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/platform-server@6.1.10 requires a peer of @angular/platform-browser@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/platform-server@6.1.10 requires a peer of @angular/platform-browser-dynamic@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN codelyzer@4.3.0 requires a peer of @angular/compiler@>=2.3.1 <7.0.0 || >6.0.0-beta <7.0.0 but none is installed. You must install peer dependencies yourself. npm WARN codelyzer@4.3.0 requires a peer of @angular/core@>=2.3.1 <7.0.0 || >6.0.0-beta <7.0.0 but none is installed. You must install peer dependencies yourself. npm WARN @angular/animations@6.1.10 requires a peer of @angular/core@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/router@6.1.10 requires a peer of @angular/core@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/router@6.1.10 requires a peer of @angular/common@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN @angular/router@6.1.10 requires a peer of @angular/platform-browser@6.1.10 but none is installed. You must install peer dependencies yourself. npm WARN ngx-toastr@9.1.0 requires a peer of @angular/core@^6.0.0 but none is installed. You must install peer dependencies yourself. npm WARN ngx-toastr@9.1.0 requires a peer of @angular/common@^6.0.0 but none is installed. You must install peer dependencies yourself. npm WARN ngx-toastr@9.1.0 requires a peer of @angular/platform-browser@^6.0.0 but none is installed. You must install peer dependencies yourself.

• @types/underscore@1.8.9 added 1 package from 5 contributors and audited 40215 packages in 20.546s found 0 vulnerabilities

之后我收到此错误:

./src/app/services/pager.service.ts
Module not found: Error: Can't resolve 'underscore' in 'e:\xampp\htdocs\testapp\src\app\services

请帮助我。

Answer 1

您需要将 underscore 安装到依赖项中，并将 @types/underscore 安装到 devDependency 中。

npm i underscore --save
npm i @types/underscore --save-dev

然后就可以使用它了。