Angular2：未滿足PEER DEPENDENCY [email protected]

Question

有誰告訴我爲什麼NPM是讓我這個消息時，我執行npm install：

+-- @angular/common@2.2.4 
+-- @angular/core@2.2.4 
+-- @angular/http@2.2.4 
+-- @angular/platform-browser@2.2.4 
+-- @types/core-js@0.9.35 
+-- UNMET PEER DEPENDENCY rxjs@5.0.0-rc.4 
| `-- symbol-observable@1.0.4 
`-- zone.js@0.6.26 

什麼UNMET PEER DEPENDENCY？

的packages.json內容是：

{ 
... 
"dependencies": { 
    "@angular/common": "^2.2.4", 
    "@angular/core": "^2.2.4", 
    "@angular/http": "^2.2.4", 
    "@angular/platform-browser": "^2.2.4", 
    "rxjs": "^5.0.0-beta.12", 
    "zone.js": "^0.6.21" 
} 
} 

爲什麼npm試圖解決rxjs@5.0.0-rc.4，而不是rxjs@5.0.0-beta.12？

Answer 1

這裏是一個工作package.json：

{ 
    ... 
    "dependencies": { 
    "@angular/common": "^2.2.4", 
    "@angular/core": "^2.2.4", 
    "@angular/http": "^2.2.4", 
    "@angular/platform-browser": "^2.2.4", 
    "rxjs": "5.0.0-beta.12", 
    "zone.js": "^0.6.21" 
    } 
} 

只是刪除^