相关疑难解决方法(0)

我已经travis-ci与我的GitHub帐户集成(https://github.com/pradeep0601/Angular5-Router-App).

当我将@angular/cli版本从1.7.4 更新到6.0.0-rc.3时,构建开始失败并出现错误:

Local workspace file ('angular.json') could not be found.
Error: Local workspace file ('angular.json') could not be found.
    at WorkspaceLoader._getProjectWorkspaceFilePath (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/workspace-loader.js:37:19)
    at WorkspaceLoader.loadWorkspace (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/workspace-loader.js:24:21)
    at TestCommand._loadWorkspaceAndArchitect (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:177:32)
    at TestCommand.<anonymous> (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:45:25)
    at Generator.next (<anonymous>)
    at /home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:3:12)
    at TestCommand.initialize (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:44:16)
    at /home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/command-runner.js:100:23

package.json片段以更好地了解运行环境:

    "@angular/cli": "6.0.0-rc.3",
    "@angular/compiler-cli": "^5.2.0",
    "@angular/language-service": "^5.2.0",
    "@types/jasmine": "~2.8.3",
    "@types/jasminewd2": "~2.0.2",

我正在使用角度2.4.9进行应用程序开发,所以我需要使用特定版本的ng cli而不是最新版本.

我知道下面的命令将安装最新版本的ng cli

npm install -g @angular/cli

但是如何安装特定版本的ng cli？

我已全局升级了我的Angular CLI,但我的项目使用的是旧版本的角度CLI,所以我想全局降级我的Angular CLI.