feat: SLA threshold card component (#9163)

- Component to display SLA timer in the conversation card and header

app/javascript/dashboard/helper/directives/resize.js

@@ -0,0 +1,41 @@
+import { debounce } from '@chatwoot/utils';
+
+const RESIZE_OBSERVER_DEBOUNCE_TIME = 100;
+
+function createResizeObserver(el, binding) {
+  const { value } = binding;
+  const observer = new ResizeObserver(
+    debounce(entries => {
+      const entry = entries[0];
+      if (entry && value && typeof value === 'function') {
+        value(entry);
+      }
+    }, RESIZE_OBSERVER_DEBOUNCE_TIME)
+  );
+
+  el.cwResizeObserver = observer;
+  observer.observe(el);
+}
+
+function destroyResizeObserver(el) {
+  if (el.cwResizeObserver) {
+    el.cwResizeObserver.unobserve(el);
+    el.cwResizeObserver.disconnect();
+    delete el.cwResizeObserver;
+  }
+}
+
+export default {
+  bind(el, binding) {
+    createResizeObserver(el, binding);
+  },
+  update(el, binding) {
+    if (binding.oldValue !== binding.value) {
+      destroyResizeObserver(el);
+      createResizeObserver(el, binding);
+    }
+  },
+  unbind(el) {
+    destroyResizeObserver(el);
+  },
+};

app/javascript/dashboard/helper/specs/directives/resize.spec.js

@@ -0,0 +1,78 @@
+import resize from '../../directives/resize';
+
+class ResizeObserverMock {
+  // eslint-disable-next-line class-methods-use-this
+  observe() {}
+
+  // eslint-disable-next-line class-methods-use-this
+  unobserve() {}
+
+  // eslint-disable-next-line class-methods-use-this
+  disconnect() {}
+}
+
+describe('resize directive', () => {
+  let el;
+  let binding;
+  let observer;
+
+  beforeEach(() => {
+    el = document.createElement('div');
+    binding = {
+      value: jest.fn(),
+    };
+    observer = {
+      observe: jest.fn(),
+      unobserve: jest.fn(),
+      disconnect: jest.fn(),
+    };
+    window.ResizeObserver = ResizeObserverMock;
+    jest.spyOn(window, 'ResizeObserver').mockImplementation(() => observer);
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should create ResizeObserver on bind', () => {
+    resize.bind(el, binding);
+
+    expect(ResizeObserver).toHaveBeenCalled();
+    expect(observer.observe).toHaveBeenCalledWith(el);
+  });
+
+  it('should call callback on observer callback', () => {
+    el = document.createElement('div');
+    binding = {
+      value: jest.fn(),
+    };
+
+    resize.bind(el, binding);
+
+    const entries = [{ contentRect: { width: 100, height: 100 } }];
+    const callback = binding.value;
+    callback(entries[0]);
+
+    expect(binding.value).toHaveBeenCalledWith(entries[0]);
+  });
+
+  it('should destroy and recreate observer on update', () => {
+    resize.bind(el, binding);
+
+    resize.update(el, { ...binding, oldValue: 'old' });
+
+    expect(observer.unobserve).toHaveBeenCalledWith(el);
+    expect(observer.disconnect).toHaveBeenCalled();
+    expect(ResizeObserver).toHaveBeenCalledTimes(2);
+    expect(observer.observe).toHaveBeenCalledTimes(2);
+  });
+
+  it('should destroy observer on unbind', () => {
+    resize.bind(el, binding);
+
+    resize.unbind(el);
+
+    expect(observer.unobserve).toHaveBeenCalledWith(el);
+    expect(observer.disconnect).toHaveBeenCalled();
+  });
+});