add auto unsubscribe component

src/index.ts

@@ -1,3 +1,4 @@
 export * from './lib/common-ui.module';
 export * from './lib/buttons/icon-button/icon-button.component';
 export * from './lib/buttons/icon-button/icon-button-type.model';
+export * from './lib/base/auto-unsubscribe.component';

src/lib/base/auto-unsubscribe.component.ts

@@ -0,0 +1,28 @@
+import { Component, OnDestroy } from '@angular/core';
+import { Subscription } from 'rxjs';
+
+/**
+ * Inherit this class when you need to subscribe to observables in your components
+ */
+@Component({ template: '' })
+export abstract class AutoUnsubscribeComponent implements OnDestroy {
+    private readonly _subscriptions = new Subscription();
+
+    /**
+     * Call this method when you want to subscribe to an observable
+     * @param subscription - the new subscription to add to subscriptions array
+     */
+    set addSubscription(subscription: Subscription) {
+        this._subscriptions.closed = false;
+        this._subscriptions.add(subscription);
+    }
+
+    /**
+     * This method unsubscribes active subscriptions
+     * If you implement OnDestroy in a component that inherits AutoUnsubscribeComponent,
+     * then you must explicitly call super.ngOnDestroy()
+     */
+    ngOnDestroy(): void {
+        this._subscriptions.unsubscribe();
+    }
+}