Library schematic does not support path property

从 issue 中链接的最小复现仓库开始，跟踪 @schematics/angular/library/index.js 中的 library schematic 入口点，以及错误堆栈中的 utility/workspace.js。确认应用程序在子文件夹中生成时路径是如何处理的。当 library schematic 接受该路径，并且能够在没有 workspace 错误的情况下找到生成的应用程序的 angular.json 时，即表示完成。

🐞 Bug report

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc
- [X] schematics

Is this a regression?

Not as far as I know

Description

I tried to create a schematic that generates an application and adds a library to it. However, the library schematic does not accept a path as parameter and it then attempts to create the library in the folder that contains the application. Specifically, it tries to read the angular.json file from the folder containing the application folder (e.g. the folder where the schematic is run).

Note that I expected the path property to work, as it's included with most of the other Angular schematics, for example component, module and service.

🔬 Minimal Reproduction

A minimal reproduction may be found in this repo.

It also addresses a problem I had when trying to work around this with applyToSubtree.

Here is the simplest description I could come up with.

Given this factory:

export function createProject(_options: any): Rule {
  return (_tree: Tree, _context: SchematicContext) => {
    return chain([
      externalSchematic('@schematics/angular', 'ng-new', optionsNew),
      externalSchematic('@schematics/angular', 'library', optionsLib)
    ]);
  };
}

If you execute the schematic in a folder named /parent/folder and the app generates in a new folder named app (/parent/folder/app), the library schematic searches for the angular.json in /parent/folder instead of /parent/folder/app.

🔥 Exception or Error

An error occured:
Error: Unable to locate a workspace file for workspace path.
    at Object.readWorkspace (C:\dev\scratchpad\scaffolding-tests\node_modules\@angular-devkit\core\src\workspace\core.js:74:19)
    at async Object.getWorkspace (C:\dev\scratchpad\scaffolding-tests\node_modules\@schematics\angular\utility\workspace.js:51:27)
    at async C:\dev\scratchpad\scaffolding-tests\node_modules\@schematics\angular\library\index.js:153:27

🌍 Your Environment

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

Angular CLI: 8.3.1
Node: 12.12.0
OS: win32 x64
Angular: undefined
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.803.1 (cli-only)
@angular-devkit/core         8.3.17
@angular-devkit/schematics   8.3.17
@schematics/angular          8.3.1 (cli-only)
@schematics/update           0.803.1 (cli-only)
rxjs                         6.4.0
typescript                   3.5.3

Similar issues

https://github.com/angular/angular-cli/issues/17598