TypeError: Cannot read property 'members' of undefined

Question

I started upgrading from Angular 4.4.4 to 5.1.1 today. I have had to upgrade a number of other packages that rely on angular as well. I get an error with so little context that I have no idea where to start. Has anyone else seen this and know what the issue is?

$ 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.

I find it strange that it starts in AotSummaryResolver when I have --aot=false in the serve command.

Here is my 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"
  }
}

My angular-cli version is 1.6.1.

The error seems to occur here in the angular source code: https://github.com/angular/angular/blob/b3eb1db6dd57a0820cfc94af5460ceb3fea20610/packages/compiler/src/aot/summary_resolver.ts#L68

SOLUTION

Previously I thought it was related to ng-bootstrap which was incorrect.

I found some context for it by putting a console log at line 15207 in compiler.umd.js as follows:

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

Which resulted in:

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

I had a module with entryComponents: [MdProgressSpinner] where MdProgressSpinner was not imported. When I removed it that error went away... and the next one came :)

Answer 1

One of the reasons this can happen is in you app module, you have an entry components which the build process can't find a import for (in below example if I comment out the import line and leave the component then it causes this error).

Answer 2

I had the same issue and nearly gave up. Your question contained the tip that helped me pinpoint the problem, but I totally missed it because it was part of the question.

Put a console log at line 15258 in compiler.umd.js (or whatever exact line your error points you to):

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

My console log contained the following at the end: { ngMetadataName: 'NgModule', declarations: [ null ], ... entryComponents: [ null ] }

The issue turned out to be a Module that imported a class like this:

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

The class was exported using default:

export default class MyComponent { ...

Removing default, and adding curly brackets to the import worked!

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

Answer 3

I was getting this error message when creating a new library. It turned out that in public_api.ts of that library, I was importing an index.ts file. This type of bundle are still not handle well. Making separate imports to each file to expose the public API was the solution in my case.