MaximBalaganskiy/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Dumber Gist</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
  <base href="/">
</head>
<!--
Dumber gist uses dumber bundler, the default bundle file
is /dist/entry-bundle.js.
The starting module is pointed to aurelia-bootstrapper
(data-main attribute on script) for Aurelia,
The aurelia bootstrapper then loads up user module "main"
(aurelia-app attribute on <body>) which is your src/main.ts.
-->
<body aurelia-app="main">
  <script src="/dist/entry-bundle.js" data-main="aurelia-bootstrapper"></script>
</body>
</html>

## package.json
{
  "dependencies": {
    "aurelia-bootstrapper": "^2.3.3"
  }
}

## src\app.html
<template>
  <require from="./tree-view"></require>
  <h1>${message}</h1>
  <tree-view nodes.bind="nodes">
    <tree-node>${n.name}</tree-node>
  </tree-view>

</template>

## src\app.ts
export class App {
  public message: string = 'Hello Aurelia!';

    nodes = [
    { name: 'item1', children: [{ name: 'child11', children: [{ name: 'child111' }, { name: 'child112' }] }, { name: 'child12' }] },
    { name: 'item2', children: [{ name: 'child21' }, { name: 'child22' }] }
  ];
}

## src\main.ts
import {Aurelia} from 'aurelia-framework';

export function configure(aurelia: Aurelia) {
  aurelia.use
    .standardConfiguration()
    .developmentLogging('info');
  aurelia.start().then(() => aurelia.setRoot());
}

## src\tree-view.html
<template>

</template>

## src\tree-view.ts
import { customElement, bindable, useView, PLATFORM, child, processContent,
       ViewCompiler, ViewResources, BehaviorInstruction, ViewCompileInstruction} from 'aurelia-framework';
import { INode } from './i-item';

@customElement('tree-view')
@useView(PLATFORM.moduleName('./tree-view.html'))
@processContent(TreeView.processContent)
export class TreeView {

  @bindable
  nodes: INode[];

  static processContent(viewCompiler: ViewCompiler, resources: ViewResources, element: Element, instruction: BehaviorInstruction) {
    const elementResource = instruction.type;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const viewResources = (elementResource as any).viewFactory.resources;
    const treeNode = element.querySelector('tree-node');
    const shouldCreateFactory = !!treeNode;
    // inside this if, we are going to create a new factory to supply
    // to the creation of the custom element
    if (shouldCreateFactory) {
      const compileInstruction = new ViewCompileInstruction(/* shadow DOM? */false, true);
      const template = `
      <template>
  <ul>
    <li repeat.for="n of nodes">
      ${treeNode.innerHTML}
      <tree-view if.bind="n.children" nodes.bind="n.children">
        <tree-node>${treeNode.innerHTML}</tree-node>
      </tree-view>
    </li>
  </ul>
      </template>`;
      const viewFactory = viewCompiler.compile(template, viewResources, compileInstruction);
      // override default view factory
      // Aurelia fallbacks to instruction view factory if there's any
      instruction.viewFactory = viewFactory;
      // only use the content as template
      // remove all after use to avoid undesirable visual
      element.innerHTML = '';
    }
    return false;
  }

}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Dumber Gist</title>
	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
	<base href="/">
	</head>
	<!--
	Dumber gist uses dumber bundler, the default bundle file
	is /dist/entry-bundle.js.
	The starting module is pointed to aurelia-bootstrapper
	(data-main attribute on script) for Aurelia,
	The aurelia bootstrapper then loads up user module "main"
	(aurelia-app attribute on <body>) which is your src/main.ts.
	-->
	<body aurelia-app="main">
	<script src="/dist/entry-bundle.js" data-main="aurelia-bootstrapper"></script>
	</body>
	</html>
	<template>
	<require from="./tree-view"></require>
	<h1>${message}</h1>
	<tree-view nodes.bind="nodes">
	<tree-node>${n.name}</tree-node>
	</tree-view>

	</template>
	export class App {
	public message: string = 'Hello Aurelia!';

	nodes = [
	{ name: 'item1', children: [{ name: 'child11', children: [{ name: 'child111' }, { name: 'child112' }] }, { name: 'child12' }] },
	{ name: 'item2', children: [{ name: 'child21' }, { name: 'child22' }] }
	];
	}
	import {Aurelia} from 'aurelia-framework';

	export function configure(aurelia: Aurelia) {
	aurelia.use
	.standardConfiguration()
	.developmentLogging('info');
	aurelia.start().then(() => aurelia.setRoot());
	}
	import { customElement, bindable, useView, PLATFORM, child, processContent,
	ViewCompiler, ViewResources, BehaviorInstruction, ViewCompileInstruction} from 'aurelia-framework';
	import { INode } from './i-item';

	@customElement('tree-view')
	@useView(PLATFORM.moduleName('./tree-view.html'))
	@processContent(TreeView.processContent)
	export class TreeView {

	@bindable
	nodes: INode[];

	static processContent(viewCompiler: ViewCompiler, resources: ViewResources, element: Element, instruction: BehaviorInstruction) {
	const elementResource = instruction.type;
	// eslint-disable-next-line @typescript-eslint/no-explicit-any
	const viewResources = (elementResource as any).viewFactory.resources;
	const treeNode = element.querySelector('tree-node');
	const shouldCreateFactory = !!treeNode;
	// inside this if, we are going to create a new factory to supply
	// to the creation of the custom element
	if (shouldCreateFactory) {
	const compileInstruction = new ViewCompileInstruction(/* shadow DOM? */false, true);
	const template = `
	<template>
	<ul>
	<li repeat.for="n of nodes">
	${treeNode.innerHTML}
	<tree-view if.bind="n.children" nodes.bind="n.children">
	<tree-node>${treeNode.innerHTML}</tree-node>
	</tree-view>
	</li>
	</ul>
	</template>`;
	const viewFactory = viewCompiler.compile(template, viewResources, compileInstruction);
	// override default view factory
	// Aurelia fallbacks to instruction view factory if there's any
	instruction.viewFactory = viewFactory;
	// only use the content as template
	// remove all after use to avoid undesirable visual
	element.innerHTML = '';
	}
	return false;
	}

	}