关于项目从angular4.2.4更新到5.0及angular/cli问题的说明

关于项目从angular4更新到5及angular/cli问题的说明

原项目使用的是angular4.2.4,angular/cli版本为1.4.9,在之前的使用中并没有问题。然而由于angular/cli的大版本更新(6.0),导致现在在项目中使用ng指令,如ng g c来创建新组件时,会报错如下:

Cannot read property 'NullLogger' of undefinedTypeError: Cannot read property 'NullLogger' of undefined    at SchematicEngine.createContext (D:\Projects\demo\node_modules\@angular-devkit\schematics\src\engine\engine.js:64:38)    at SchematicImpl.call (D:\Projects\demo\node_modules\@angular-devkit\schematics\src\engine\schematic.js:35:38)    at Promise (D:\Projects\demo\node_modules\@angular\cli\tasks\schematic-run.js:72:23)    at Class.run (D:\Projects\demo\node_modules\@angular\cli\tasks\schematic-run.js:71:16)    at Class.run (D:\Projects\demo\node_modules\@angular\cli\commands\generate.js:149:33)    at resolve (D:\Projects\demo\node_modules\@angular\cli\ember-cli\lib\models\command.js:261:20)    at Class.validateAndRun (D:\Projects\demo\node_modules\@angular\cli\ember-cli\lib\models\command.js:240:12)    at Promise.resolve.then.then (D:\Projects\demo\node_modules\@angular\cli\ember-cli\lib\cli\cli.js:140:24)

经查阅资料,原因是本地项目使用的angular/cli版本太低,于是开始升级angualr/cli的版本:

执行:npm install -g @angular/cli@latest

然后再运行,会报错:

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. (/home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:45:25) at Generator.next () at /home/travis/build/pradeep0601/Angular5-Router-App/node_modules/@angular/cli/models/architect-command.js:7:71 at new Promise () 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

可能是由于angular/cli版本与项目不匹配导致。

于是,总结升级angular/cli步骤如下:

1.全局卸载angular/cli:

npm uninstall -g @angular/cli

2.清理:

npm cache verify

3.全局安装最新angular/cli:

(注:angular5项目最好安装angular/cli 1.7.4版本;npm install -g @angular/[email protected]

npm install -g @angular/cli@latest   (这样安装的是angular/cli 6)


4.在项目路径下卸载angular/cli:

npm uninstall --save-dev @angular/cli

5.在项目路径下安装:

npm install --save-dev @angular/[email protected]

6.项目路径下npm install或者yarn install

7.在npm安装后修复问题:

npm audit fix

8.解决与“angular.json”相关的问题:

ng update @angular/cli --migrate-only --from=1.4.9


在完成这些步骤之后,运行项目,会提示该angular/cli版本仅支持angular5.0及以上版本,于是还需要升级angular版本,此时应当看angular官方文档,会有升级说明,以及一个升级指导,链接如下:

angular更新指南     

由于此项目是从angular4.2.4升级到angular5.0,项目容量中等,且用yarn管理包,选择如下:


关于项目从angular4.2.4更新到5.0及angular/cli问题的说明_第1张图片

然后点击show me how to update,下面会列出更新要点;

这里会执行:

yarn add @angular/animations@^5.0.0 @angular/common@^5.0.0 @angular/compiler@^5.0.0 @angular/compiler-cli@^5.0.0 @angular/core@^5.0.0 @angular/forms@^5.0.0 @angular/http@^5.0.0 @angular/platform-browser@^5.0.0 @angular/platform-browser-dynamic@^5.0.0 @angular/platform-server@^5.0.0 @angular/router@^5.0.0 [email protected] rxjs@^5.5.2

完成!现在可以运行项目了,而且可以正常创建新组件了。


参考:

travis ci - Error: Local workspace file ('angular.json') could not be found - Stack Overflow

Angular Update Guide

Angular CLI

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