[BUG] <rejected> TypeError: Cannot read property 'concat' of undefined

[codeNoobie]

[BUG]

Overview of the issue

I am getting this error while generating docs. Not sure what is causing this. Any help is greatly appreciated.

Unhandled Rejection at: Promise {
TypeError: Cannot read property 'concat' of undefined
at Path/node_modules/@compodoc/compodoc/dist/index-cli.js:3533:71
at Array.forEach ()
at ExtendsMerger.merge (Path/node_modules/@compodoc/compodoc/dist/index-cli.js:3513:25)
at Dependencies.getDependencies (Path/node_modules/@compodoc/compodoc/dist/index-cli.js:5487:35)
at CliApplication.Application.getDependenciesData (Path/node_modules/@compodoc/compodoc/dist/index-cli.js:7079:40)
at Path/node_modules/@compodoc/compodoc/dist/index-cli.js:6924:23
at } reason: TypeError: Cannot read property 'concat' of undefined
at Path/node_modules/@compodoc/compodoc/dist/index-cli.js:3533:71
at Array.forEach ()
at ExtendsMerger.merge (Path/node_modules/@compodoc/compodoc/dist/index-cli.js:3513:25)
at Dependencies.getDependencies (Path/node_modules/@compodoc/compodoc/dist/index-cli.js:5487:35)
at CliApplication.Application.getDependenciesData (Path/node_modules/@compodoc/compodoc/dist/index-cli.js:7079:40)
at Path/node_modules/@compodoc/compodoc/dist/index-cli.js:6924:23
at
[13:13:39] Sorry, but there was a problem during parsing or generation of the documentation. Please fill an issue on github. (https://github.com/compodoc/compodoc/issues/new)

Operating System, Node.js, npm, compodoc version(s)

node -v
v9.8.0

npm -v
5.6.0

compodoc -V
1.1.2

macOS High Sierra

Angular configuration, a package.json file in the root folder

I am using Yarn workspaces. The compodoc works well with one of the workspace. But it fails for another.

Angular-cli.json
{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "project": {
    "name": "core-project"
  },
  "packageManager": "yarn",
  "apps": [{
    "name": "distro",
    "root": "src",
    "outDir": "dist",
    "assets": [
        "assets",
        "favicon.ico"
    ],
    "index": "index.html",
    "main": "main.ts",
    "polyfills": "polyfills.ts",
    "test": "test.ts",
    "tsconfig": "tsconfig.distro.json",
    "testTsconfig": "tsconfig.spec.json",
    "prefix": "core-project",
    "styles": [],
    "scripts": []
  }],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [{
      "project": "src/tsconfig.distro.json",
      "exclude": "**/node_modules/**"
    },
    {
      "project": "src/tsconfig.spec.json",
      "exclude": "**/node_modules/**"
    }
  ],
  "test": {
    "karma": {
      "config": "./src/test-config/karma.prod.conf.js"
    }
  },
  "defaults": {
    "styleExt": "scss",
    "component": {}
  }
}

Package.json
{
    "name": "core-project",
    "version": "0.0.0",
    "private": false,
    "scripts": {
        "compodoc": "./node_modules/.bin/compodoc -p src/tsconfig.distro.json"
    },
    "ngPackage": {
        "$schema": "node_modules/ng-packagr/ng-package.schema.json",
        "dest": "dist",
        "workingDirectory": ".ng_build",
        "lib": {
            "entryFile": "src/public_api.ts",
            "cssUrl": "inline"
        }
    },
    "peerDependencies": {
        "@angular/common": "~5.2.0",
        "@angular/core": "~5.2.0",
        "@angular/platform-browser": "~5.2.0",
        "@angular/platform-browser-dynamic": "~5.2.0",
        "@appd/common": "~1.0.4-92",
        "core-js": "~2.4.1",
        "lodash": "4.17.4",
        "rxjs": "~5.5.2",
        "zone.js": "~0.8.20"
    },
    "devDependencies": {
        "@angular/cli": "~1.6.0",
        "@appd/common": "~1.0.4-92",
        "@appd/test": "1.0.4-94",
        "@compodoc/compodoc": "^1.1.2",
        "karma": "^2.0.0",
        "karma-cli": "~1.0.1"
    }
}

tsconfig.distro.json

{
  "extends": "../../../tsconfig-base.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "module": "es2015",
    "types": [],
    "experimentalDecorators": true
  },
  "angularCompilerOptions": {
    "preserveWhitespaces": false
  },
  "include": [
    "**/*.ts"
  ],
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

Compodoc installed globally or locally ?

Locally.

Motivation for or Use Case

Generating documentation for packages in my mono repo. Please note that compodoc works for one package but fails for another with the above exception.

It did not generate the documentation.

Reproduce the error

It failed when i ran ./node_modules/.bin/compodoc -p src/tsconfig.distro.json

Related issues

Suggest a Fix

[vogloblinsky]

@codeNoobie Fixed by enforcing extends-merger.util
If you have an example of your code with a component extending somthing, or a class extending anothe rthing, it could be nice to add more unit testing on this.

[codeNoobie]

@vogloblinsky We do have cases where component extends from an abstract class. Was that the reason behind this bug?

[vogloblinsky]

@codeNoobie.
It could. Could you extract an example for debugging and testing enforcement ?
Thanks

[codeNoobie]

Sure. Will do it by tomorrow.

[lock]

This issue has been automatically locked due to inactivity. Please file a new issue if you are encountering a similar or related problem. Why locking ? Having issues with the most up-to-date context.