Angular ng serve 产生错误：NGCC 失败

Question

运行后，ng serve我在终端窗口中出现异常：

编译@angular/core : 模块为 esm5

Error: Error on worker #1: TypeError: Cannot read property 'map' of undefined

并在下面留言：

An unhandled exception occurred: NGCC failed.

有关/tmp/ng-EAdxWj/angular-errors.log更多详细信息，请参阅。

角度errors.log：

[error] Error: NGCC failed.
    at NgccProcessor.process (/IdeaProjects/app/frontend/node_modules/@ngtools/webpack/src/ngcc_processor.js:76:19)
    at /IdeaProjects/app/frontend/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:579:31
    at SyncHook.eval [as call] (eval at create (/IdeaProjects/app/frontend/node_modules/tapable/lib/HookCodeFactory.js:19:10), <anonymous>:7:1)
    at SyncHook.lazyCompileHook (/IdeaProjects/app/frontend/node_modules/tapable/lib/Hook.js:154:20)
    at Object.webpack [as webpackFactory] (/IdeaProjects/app/frontend/node_modules/webpack/lib/webpack.js:55:30)
    at createWebpack (/IdeaProjects/app/frontend/node_modules/@angular-devkit/build-webpack/src/webpack-dev-server/index.js:20:36)
    at Object.runWebpackDevServer (/IdeaProjects/app/frontend/node_modules/@angular-devkit/build-webpack/src/webpack-dev-server/index.js:46:12)
    at SwitchMapSubscriber.project (/IdeaProjects/app/frontend/node_modules/@angular-devkit/build-angular/src/dev-server/index.js:191:32)
    at SwitchMapSubscriber._next (/IdeaProjects/app/frontend/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/operators/switchMap.js:49:27)
    at SwitchMapSubscriber.Subscriber.next (/IdeaProjects/app/frontend/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/Subscriber.js:66:18)
    at /IdeaProjects/app/frontend/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/util/subscribeToPromise.js:7:24
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

Answer 1

刚刚有同样的问题。

通过向 tsconfig.app.json 添加以下内容来修复它：

"angularCompilerOptions": {
    "enableIvy": false
},

希望这可以帮助

Answer 2

我有错误：

Unknown arguments: use-program-dependencies, useProgramDependencies
An unhandled exception occurred: NGCC failed.
See "C:\...\angular-errors.log" for further details.

我刚刚更新了项目所需的 angular cli、material 和 core 以及其他模块，然后更新了 npm 和 typescript 包，仅此而已。

ng update @angular/cli @angular/core
npm update @angular/material @angular/cdk
npm install -g typescript@latest

Answer 3

在我的特殊情况下，@angular-devkit/build-angular 在运行 npm 审计修复后在我的 package.json 中更新为“^0.1002.0”。（这个版本好像属于angular 10，而不是本地项目的angular版本（v9.1.3））

恢复此更改后，一切又开始工作：

“@angular-devkit/build-angular”：“~0.901.12”