ng help generate: crashes on Angular 5.2.2

[h-bex]

Versions

$ ng --version

    _                      _                 ____ _     ___
   / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
 / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
/_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
               |___/

Angular CLI: 1.6.6
Node: 8.9.4
OS: win32 x64
Angular: 5.2.2
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cli: 1.6.6
@angular-devkit/build-optimizer: 0.0.42
@angular-devkit/core: 0.0.29
@angular-devkit/schematics: 0.0.52
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.9.6
@schematics/angular: 0.1.17
typescript: 2.4.2
webpack: 3.10.0

Windows Version: Windows 10 Version 1709

Repro steps

• ng help generate
• Alternative: ng help generate service

Observed behavior

$ ng help generate service
Cannot read property '0' of undefined
TypeError: Cannot read property '0' of undefined
    at Class.getCollectionName (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\commands\generate.js:57:36)
    at Class.printDetailedHelp (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\commands\generate.js:179:37)
    at commandFiles.forEach.cmd (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\commands\help.js:57:38)
    at Array.forEach (<anonymous>)
    at Class.run (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\commands\help.js:36:22)
    at resolve (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\ember-cli\lib\models\command.js:261:20)
    at new Promise (<anonymous>)
    at Class.validateAndRun (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\ember-cli\lib\models\command.js:240:12)
    at Promise.resolve.then.then (D:\Users\harbmihi\Projects\WebProjects\Learning\Udemy\Angular5\Downloads\services-start\node_modules\@angular\cli\ember-cli\lib\cli\cli.js:140:24)
    at <anonymous>

Desired behavior

• Program shall not crash
• Program shall give valid output

Mention any other details that might be useful (optional)

N/A

[angelkenneth]

Noticed this issue too because Webstorm is using this command to know the available things that generate can do. This issue seems to only exists on @angular/cli==1.6.6; because when i downgrade to @angular/cli==1.6.5 the issue doesn't occur anymore.

[denofevil]

Dennis from WebStorm team here. I can confirm that this fails with the same output for me. We'll be releasing WebStorm 2017.3.4 with a workaround (loading predefined list if the command fails), but would love to get a proper fix.

[chriskyndrid]

@denofevil, also experiencing the issue with 1.6.6. Thanks for your efforts on the workaround. @h-bex thanks for reporting the issue.

[raven1152]

I also noticed this due to the interaction with WebStorm. Actual generate commands still seem to work, and top level help seems to work, as does help on other commands... just not for the generate command.

[kayvanbree]

Same here on 1.6.6 in Webstorm. Updated Angular CLI because of another bug, so I'll have to manually (cmd) generate my components for now.

[Flash1232]

Is this fixed in 1.6.7?

[h-bex]

This is not fixed in 1.6.7:

ng --version

    _                      _                 ____ _     ___
   / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
 / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
/_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
               |___/

Angular CLI: 1.6.7
Node: 8.9.4
OS: win32 x64
Angular:
...

The behavior of the help generate command:

ng help generate
Cannot read property '0' of undefined
TypeError: Cannot read property '0' of undefined
    at Class.getCollectionName (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\commands\generate.js:57:36)
    at Class.printDetailedHelp (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\commands\generate.js:179:37)
    at commandFiles.forEach.cmd (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\commands\help.js:57:38)
    at Array.forEach (<anonymous>)
    at Class.run (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\commands\help.js:36:22)
    at resolve (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\ember-cli\lib\models\command.js:261:20)
    at new Promise (<anonymous>)
    at Class.validateAndRun (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\ember-cli\lib\models\command.js:240:12)
    at Promise.resolve.then.then (D:\Users\harbmihi\AppData\Roaming\npm\node_modules\@angular\cli\ember-cli\lib\cli\cli.js:140:24)
    at <anonymous>

[h-bex]

Sorry; wrong button; have to reopen it again.