TypeError：无法读取属性＆＃39;成员＆＃39;未定义的

Question

我今天开始从Angular 4.4.4升级到5.1.1。我不得不升级一些依赖于角度的其他软件包。我得到一个错误，上下文很少，我不知道从哪里开始。还有其他人看过这个并知道问题是什么吗？

$ ng serve --aot=false
** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
Date: 2017-12-19T15:26:36.137Z
Hash: bf0b773d5dfafdd9133b
Time: 16934ms
chunk {inline} inline.bundle.js (inline) 5.79 kB [entry] [rendered]
chunk {main} main.bundle.js (main) 2.93 kB [initial] [rendered]
chunk {polyfills} polyfills.bundle.js (polyfills) 636 bytes [initial] [rendered]
chunk {scripts} scripts.bundle.js (scripts) 307 kB [initial] [rendered]
chunk {styles} styles.bundle.js (styles) 4.03 MB [initial] [rendered]
chunk {vendor} vendor.bundle.js (vendor) 855 kB [initial] [rendered]

ERROR in TypeError: Cannot read property 'members' of undefined
    at AotSummaryResolver.resolveSummary (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:32638:56)
    at CompileMetadataResolver._loadSummary (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:14825:66)
    at CompileMetadataResolver._getEntryComponentMetadata (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:15857:66)
    at C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:15323:55
    at Array.map (<anonymous>)
    at CompileMetadataResolver.getNgModuleMetadata (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:15323:18)
    at CompileMetadataResolver.getNgModuleSummary (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:15157:52)
    at C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:15245:72
    at Array.forEach (<anonymous>)
    at CompileMetadataResolver.getNgModuleMetadata (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:15230:49)
    at visitLazyRoute (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:31061:104)
    at AotCompiler.listLazyRoutes (C:\source\app\node_modules\@angular\compiler\bundles\compiler.umd.js:31029:20)
    at AngularCompilerProgram.listLazyRoutes (C:\source\app\node_modules\@angular\compiler-cli\src\transformers\program.js:156:30)
    at Function.NgTools_InternalApi_NG_2.listLazyRoutes (C:\source\app\node_modules\@angular\compiler-cli\src\ngtools_api.js:44:36)
    at AngularCompilerPlugin._getLazyRoutesFromNgtools (C:\source\app\node_modules\@ngtools\webpack\src\angular_compiler_plugin.js:248:66)
    at Promise.resolve.then.then (C:\source\app\node_modules\@ngtools\webpack\src\angular_compiler_plugin.js:562:50)

webpack: Failed to compile.

我觉得很奇怪，当我在serve命令中使用--aot = false时，它会在AotSummaryResolver开始。

这是我的package.json：

{
  "name": "test",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve --aot=false",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@agm/core": "^1.0.0-beta.2",
    "@angular-devkit/schematics": "^0.0.42",
    "@angular/animations": "5.1.1",
    "@angular/cdk": "5.0.1",
    "@angular/common": "5.1.1",
    "@angular/compiler": "5.1.1",
    "@angular/core": "5.1.1",
    "@angular/forms": "5.1.1",
    "@angular/http": "5.1.1",
    "@angular/platform-browser": "5.1.1",
    "@angular/platform-browser-dynamic": "5.1.1",
    "@angular/platform-server": "5.1.1",
    "@angular/router": "5.1.1",
    "@auth0/angular-jwt": "^1.0.0-beta.9",
    "@ng-bootstrap/ng-bootstrap": "^1.0.0-beta.8",
    "@ng-idle/core": "^2.0.0-beta.13",
    "@ngrx/core": "^1.2.0",
    "@ngrx/effects": "^4.1.1",
    "@ngrx/entity": "^4.1.1",
    "@ngrx/store": "^4.1.1",
    "@ngrx/store-devtools": "^4.1.1",
    "@schematics/angular": "^0.1.11",
    "@schematics/schematics": "^0.0.11",
    "angular2-counto": "^1.2.3",
    "bootstrap": "4.0.0-beta.2",
    "core-js": "2.4.1",
    "d3": "^4.11.0",
    "echarts": "^3.6.0",
    "echarts-gl": "^1.0.0-alpha.5",
    "font-awesome": "^4.7.0",
    "global": "^4.3.2",
    "intl": "^1.2.5",
    "jquery": "^3.2.1",
    "moment": "^2.19.4",
    "ng2-dnd": "^5.0.2",
    "popper.js": "^1.11.0",
    "roboto-fontface": "^0.7.0",
    "rxjs": "^5.5.2",
    "toastr": "^2.1.2",
    "ts-action": "^3.2.2",
    "typings": "^2.1.1",
    "uuid": "^3.1.0",
    "web-animations-js": "^2.2.5",
    "yarn": "^0.24.5",
    "zone.js": "0.8.4"
  },
  "devDependencies": {
    "@angular/cli": "1.6.1",
    "@angular/compiler-cli": "5.1.1",
    "@types/d3": "^4.11.0",
    "@types/echarts": "^0.0.6",
    "@types/hammerjs": "^2.0.34",
    "@types/jasmine": "2.5.38",
    "@types/jquery": "^2.0.45",
    "@types/node": "^7.0.23",
    "@types/toastr": "^2.1.33",
    "@types/uuid": "^3.4.0",
    "codelyzer": "^4.0.2",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "json-server": "^0.12.0",
    "jsonwebtoken": "^7.4.1",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.0",
    "ts-node": "~2.0.0",
    "tslint": "^5.8.0",
    "typemoq": "^1.7.0",
    "typescript": "2.4.2"
  }
}

我的angular-cli版本是1.6.1。

错误似乎发生在角度源代码中： https://github.com/angular/angular/blob/b3eb1db6dd57a0820cfc94af5460ceb3fea20610/packages/compiler/src/aot/summary_resolver.ts#L68

解

之前我认为它与ng-bootstrap有关，这是不正确的。

我通过在compiler.umd.js中将控制台日志放在第15207行找到了一些上下文，如下所示：

if (meta.entryComponents) {
    console.log(meta);
    entryComponents.push.apply(entryComponents, flattenAndDedupeArray(meta.entryComponents)
                .map(function (type) { return /** @type {?} */ ((_this._getEntryComponentMetadata(type))); }));
}

导致：

...
entryComponents: [ undefined ],
...

我有一个entryComponents: [MdProgressSpinner]的模块，其中未导入MdProgressSpinner。当我删除它时，错误就消失了......下一个错误就来了：）

Answer 1

这可能发生的原因之一是你的应用程序模块，你有一个入口组件，构建过程无法找到导入（在下面的示例中，如果我注释掉导入行并离开组件然后它导致这个错误）。

Answer 2

我有同样的问题，几乎放弃了。你的问题包含帮助我查明问题的提示，但我完全错过了它，因为它是问题的一部分。

将控制台日志放在compiler.umd.js中的第15258行（或您的错误指向的任何确切行）：

if (meta.entryComponents) { console.log(meta); //<== Add this

我的控制台日志最后包含以下内容： {ngMetadataName：'NgModule'，   声明：[ null ]，... entryComponents：[ null ]}

问题原来是一个导入这样一个类的模块：

import MyComponent from "./my-component.component.ts";

使用默认：

导出课程

export default class MyComponent { ...

删除default，并为导入添加大括号！

import { MyComponent } from "./my-component.component.ts";

Answer 3

我在创建新的库时收到此错误消息。原来，在该库的public_api.ts中，我正在导入 index.ts 文件。这种类型的捆绑包仍然不能很好地处理。在我的情况下，对每个文件进行单独导入以公开公共API是解决方案。

Answer 4

如果您是从存储库中已经运行的应用程序中检出项目的，请检查是否在package.json中定义了构建脚本并在调用ng serve

之前执行该脚本