angular - 我如何处理在 Angular CLI 中安装对等依赖项？

Question

在尝试更新我的 Angular CLI 和 NPM 时，我发现自己陷入了几乎无穷无尽的错误循环中。每次我更新时，我都会收到警告消息，告诉我安装对等依赖项(见下文)，但每次我安装依赖项时，我都会收到更多警告消息。有没有更好的方法来处理这种情况，或者它真的需要几个小时吗？

npm WARN @angular/animations@5.2.1 requires a peer of @angular/core@5.2.1 
but none is installed. You must install peer dependencies yourself.
npm WARN @angular/compiler-cli@5.1.0 requires a peer of typescript@>=2.4.2 
<2.6 but none is installed. You must install peer dependencies yourself.
npm WARN @ng-bootstrap/ng-bootstrap@1.0.0-beta.6 requires a peer of 
@angular/core@^4.0.3 but none is installed. You must install peer 
dependencies yourself.
npm WARN @ng-bootstrap/ng-bootstrap@1.0.0-beta.6 requires a peer of 
@angular/common@^4.0.3 but none is installed. You must install peer 
dependencies yourself.
npm WARN @ng-bootstrap/ng-bootstrap@1.0.0-beta.6 requires a peer of 
@angular/forms@^4.0.3 but none is installed. You must install peer 
dependencies yourself.
npm WARN @schematics/angular@0.1.17 requires a peer of @angular-
devkit/core@0.0.29 but none is installed. You must install peer dependencies 
yourself.
npm WARN @schematics/angular@0.1.17 requires a peer of @angular-
devkit/schematics@0.0.52 but none is installed. You must install peer 
dependencies yourself.
npm WARN @schematics/schematics@0.0.11 requires a peer of @angular-
devkit/core@0.0.22 but none is installed. You must install peer dependencies 
yourself.
npm WARN angular2-notifications@0.7.4 requires a peer of 
@angular/core@^4.0.1 but none is installed. You must install peer 
dependencies yourself.
npm WARN angular2-notifications@0.7.4 requires a peer of 
@angular/common@^4.0.1 but none is installed. You must install peer 
dependencies yourself.
npm WARN angular2-notifications@0.7.4 requires a peer of @angular/platform-
browser@^4.0.0 but none is installed. You must install peer dependencies 
yourself.
npm WARN angular2-notifications@0.7.4 requires a peer of 
@angular/animations@^4.0.1 but none is installed. You must install peer 
dependencies yourself.
npm WARN bootstrap@4.0.0-beta.2 requires a peer of jquery@1.9.1 - 3 but none 
is installed. You must install peer dependencies yourself.
npm WARN bootstrap@4.0.0-beta.2 requires a peer of popper.js@^1.12.3 but 
none is installed. You must install peer dependencies yourself.
npm WARN ng2-toasty@4.0.3 requires a peer of @angular/core@^2.4.7 || ^4.0.0 
but none is installed. You must install peer dependencies yourself.
npm WARN ngx-carousel@1.3.5 requires a peer of @angular/core@^2.4.0 || 
^4.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN ngx-carousel@1.3.5 requires a peer of @angular/common@^2.4.0 || 
^4.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN tsickle@0.25.5 requires a peer of typescript@>=2.4.2 <2.6 but none 
is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 
(node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for 
fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: 
{"os":"win32","arch":"x64"})

我知道我一定做错了什么，但我是 Angular 的新手。

Answer 1

对等依赖警告通常可以忽略。只有当对等依赖项完全丢失，或者对等依赖项的版本高于您安装的版本时，您才会想要采取行动。

让我们以这个警告为例:

npm WARN @angular/animations@5.2.1 requires a peer of@angular/core@5.2.1 but none is installed. You must install peerdependencies yourself.

对于 Angular，您希望所使用的版本在所有包中保持一致。如果有任何不兼容的版本，请更改 package.json 中的版本，然后运行 ​​npm install 以便它们全部同步。我倾向于将我的 Angular 版本保持在最新版本，但您需要确保您的版本与您需要的任何 Angular 版本一致(可能不是最新版本)。

在这样的情况下:

npm WARN ngx-carousel@1.3.5 requires a peer of @angular/core@^2.4.0 ||^4.0.0 but none is installed. You must install peer dependenciesyourself.

如果您使用的 Angular 版本高于 4.0.0，那么您可能不会遇到任何问题。那就没什么可做的了。如果您使用的是 2.4.0 以下的 Angular 版本，则需要升级您的版本。更新 package.json，然后运行 ​​npm install，或者为您需要的特定版本运行 npm install。像这样:

npm install @angular/core@5.2.3 --save

如果您运行的是 npm 5.0.0 或更高版本，则可以省略 --save，该版本会将包保存在 package.json 的依赖项部分自动。

在这种情况下:

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3(node_modules\fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY:Unsupported platform for fsevents@1.1.3: wanted{"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

您运行的是 Windows，fsevent 需要 OSX。可以忽略此警告。