router-lifecyle.ts

	class MyComponent {
	constructor(public router: Router, spinner: Spinner) {
	router.events.subscribe(e => {
	if (e instanceof ChildActivationStart) {
	spinner.start(e.route);
	} else if (e instanceof ChildActivationEnd) {
	spinner.end(e.route);
	}
	});
	}
	}

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