* Push a new history entry onto the undo stack * Groups entries if they occur within the groupDelay window * Clears the redo stack when a new en

* Checks if the component should be visible. * Shows when loading, has replies, or has error.

Emit an event

* Translates a key to the localized string in the current language. * * @param key - The translation key to look up * @returns The translated

* Logs an error message if the current level permits. * @param tag - The source identifier (e.g. service or component name). * @param message -

* Transforms a translation key to its localized string value. * * @param key - The translation key to look up * @param params - Optional para

* Logs a warning message if the current level permits. * @param tag - The source identifier (e.g. service or component name). * @param message -

* Helper: create a HistoryEntry with sensible defaults.

* Show an error toast * * @param text - The message text * @param options - Optional configuration (duration, showCloseButton) * @returns

* Clear all history * Resets both undo and redo stacks * @see Requirements 6.1, 6.2

* Handles keyboard navigation within a grid. * Returns the new focused index, or -1 if no navigation occurred. * * @param event - The keyboar

* Sets the active user and clears the active group (mutual exclusivity). * @param user - The user to set as active, or null to clear

* Creates a mock KeyboardEvent for testing

Toggles selection for an item (Space key behavior). @see Requirements 3.3, 5.3, 7.3, 9.3, 13.1-13.3

* Creates a mock user.

* Sets the active group and clears the active user (mutual exclusivity). * @param group - The group to set as active, or null to clear

* Triggers change detection and waits for async operations to settle.

* Creates a CometChatGroupMemberItemComponent instance via Object.create() * to bypass Angular's inject() context requirement. * Manually wires inpu

* Triggers change detection and waits for async operations to settle.

Checks if an item is currently selected.

* Activates focus trap within a container. * * When activated, Tab and Shift+Tab navigation will cycle within the * container's focusable ele

* Creates a CometChatConversationItemComponent instance via Object.create() * to bypass Angular's inject() context requirement. * Manually wires inp

* Initialize the service with request builder configuration. * Ports the UsersManager constructor logic. * * @param config - Configuration ma

* Creates a CometChatGroupItemComponent instance via Object.create() * to bypass Angular's inject() context requirement. * Manually wires inputs, ou

* Creates a mock audio message object that mimics CometChat.MediaMessage * with the given number of attachments and optional caption.

* Routes an incoming WebSocket event into the processing queue. * Wraps in NgZone.run() so signal/state updates trigger OnPush CD.

* Creates a mock video message object that mimics CometChat.MediaMessage * with the given number of attachments and optional caption.

* Triggers change detection and waits for async operations to settle.

* Creates a mock image message object that mimics CometChat.MediaMessage * with the given number of attachments and optional caption.

* Sets the active call (ongoing or outgoing). * @param call - The active call object, or null to clear

* Apply blockquote formatting. * Exits if already in a blockquote. Removes code block first (mutual exclusivity). * @see Req 2.7

Sanitize HTML with default configuration. Results are cached. @see Requirements 13.1-13.6

* Creates a mock CometChat.CustomMessage-like object with poll metadata. * Uses duck-typing to satisfy the component's message interface.

Whether the paginated list is in loading state (initial load only)

* Creates a CometChatUserItemComponent instance via Object.create() * to bypass Angular's inject() context requirement. * Manually wires inputs, out

Creates a fake TemplateRef for testing — sufficient for identity/reference checks.

* Gets the configured view for a specific message type and bubble part. * * This method implements the priority logic for view resolution: *

* Simulates ngOnChanges for the message input on the component.

* Simulates ngOnChanges for the message input on the component.

* Set the error callback for propagating errors to the component.

* Updates an option value. * @param index - The index of the option to update * @param value - The new option value

* Creates a mock CustomMessage with configurable metadata for collaborative * document. The component extracts URL from: * metadata["@injected"]["

* Creates a mock CustomMessage with configurable metadata for collaborative * whiteboard. The component extracts URL from: * metadata["@injected"]

* Triggers change detection and waits for async operations to settle.

* Announces a message to screen readers. * * Creates a visually hidden live region element if it doesn't exist, * then updates its content to

* Full cleanup: detach listeners and reset state.

* Creates a mock CometChat.User with sensible defaults.