partey_workadventure/front/src/iframe_api.ts

import {ChatEvent} from "./Api/Events/ChatEvent";

interface WorkAdventureApi {
    sendChatMessage(message: string, author: string): void;
    onChatMessage(callback: (message: string) => void): void;
}

declare global {
    // eslint-disable-next-line no-var
    var WA: WorkAdventureApi
}

window.WA = {
    /**
     * Send a message in the chat.
     * Only the local user will receive this message.
     */
    sendChatMessage(message: string, author: string) {
        window.parent.postMessage({
            'type': 'chat',
            'data': {
                'message': message,
                'author': author
            } as ChatEvent
        }, '*');
    },
    /**
     * Listen to messages sent by the local user, in the chat.
     */
    onChatMessage(callback: (message: string) => void): void {

    }
}