https://github.com/usrrname/verbose-octo-goggles

Reproduction of FASTTreeItem bug in Angular 15 https://github.com/microsoft/fast/issues/6740
https://github.com/usrrname/verbose-octo-goggles

microsoft-fast webcomponents

Last synced: about 2 months ago
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Reproduction of FASTTreeItem bug in Angular 15 https://github.com/microsoft/fast/issues/6740

• Host: GitHub
• URL: https://github.com/usrrname/verbose-octo-goggles
• Owner: usrrname
• Created: 2023-05-20T14:33:46.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2023-07-25T23:25:36.000Z (almost 3 years ago)
• Last Synced: 2025-08-04T15:09:54.089Z (10 months ago)
• Topics: microsoft-fast, webcomponents
• Language: TypeScript
• Homepage: https://stackblitz.com/edit/fast-angular-15
• Size: 4.68 MB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# `FASTTreeItem` in Angular 15

This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 15.

# About

This is a reproduction of an issue involving use of the `ChildrenDirective` in FASTTreeItem and FASTTreeView leading to failure to render nested tree items in Angular.

[#6740](https://github.com/microsoft/fast/issues/6740)

Console errors:

```

Uncaught TypeError: Cannot read properties of undefined (reading 'fast-fmoaic-304-c')

    at ChildrenDirective.getSource (node-observation.js:[60:22](https://github.com/microsoft/fast/blob/master/packages/web-components/fast-element/src/templating/node-observation.ts#L81))

    at ChildrenDirective.handleEvent (children.js:[18:36](https://github.com/microsoft/fast/blob/master/packages/web-components/fast-element/src/templating/children.ts#L100))

    at _ZoneDelegate.invoke (zone.js:372:26)

    at Zone.runGuarded (zone.js:144:47)

    at MutationObserver. (zone.js:128:29)

```

This reproduction uses Angular 15 and the following FAST packages:

```

"@microsoft/fast-element": "2.0.0-beta.23",

"@microsoft/fast-foundation": "3.0.0-alpha.27",

"@microsoft/fast-web-utilities": "6.0.0",

```

![console error with Children Directive](./src/assets/children-error.png)

![code execution fails to continue at node-observation.js](src/assets/node-observation-error.png)

![](src/assets/children-directive-err.png)

![screenshot of erroneous behavior](src/assets/treeitem-error.png)

![screenshot of erroneous behavior](src/assets/treeview.png)

## Development server

Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The application will automatically reload if you change any of the source files.

## Code scaffolding

Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.

## Build

Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory.

## Running unit tests

Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).

## Running end-to-end tests

Run `ng e2e` to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.

## Further help

To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI Overview and Command Reference](https://angular.io/cli) page.