feat(plugins): add basic message construction (#5754)

docs/chatterino.d.ts

@@ -57,6 +57,12 @@ declare namespace c2 {
 
         add_system_message(message: string): void;
 
+        add_message(
+            message: Message,
+            context?: MessageContext,
+            override_flags?: MessageFlag | null
+        ): void;
+
         is_twitch_channel(): boolean;
 
         get_room_modes(): RoomModes;
@@ -152,4 +158,206 @@ declare namespace c2 {
         ) => WebSocket;
     }
     var WebSocket: WebSocketConstructor;
+
+    interface Message {
+        __dummy: void; // avoid being an empty interface
+    }
+    interface MessageConstructor {
+        new: (this: void, init: MessageInit) => Message;
+    }
+    var Message: MessageConstructor;
+
+    interface MessageInit {
+        flags?: MessageFlag;
+        id?: string;
+        parse_time?: number;
+        search_text?: string;
+        message_text?: string;
+        login_name?: string;
+        display_name?: string;
+        localized_name?: string;
+        user_id?: string;
+        channel_name?: string;
+        username_color?: string;
+        server_received_time?: number;
+        highlight_color?: string | null;
+        elements?: MessageElementInit[];
+    }
+
+    interface MessageElementInitBase {
+        tooltip?: string;
+        trailing_space?: boolean;
+    }
+
+    type MessageColor = "text" | "link" | "system" | string;
+
+    type MessageElementInit =
+        | TextElementInit
+        | SingleLineTextElementInit
+        | MentionElementInit
+        | TimestampElementInit
+        | TwitchModerationElementInit
+        | LinebreakElementInit
+        | ReplyCurveElementInit;
+
+    interface TextElementInit extends MessageElementInitBase {
+        type: "text";
+        text: string;
+        flags?: MessageElementFlag;
+        color?: MessageColor;
+        style?: FontStyle;
+    }
+
+    interface SingleLineTextElementInit extends MessageElementInitBase {
+        type: "single-line-text";
+        text: string;
+        flags?: MessageElementFlag;
+        color?: MessageColor;
+        style?: FontStyle;
+    }
+
+    interface MentionElementInit extends MessageElementInitBase {
+        type: "mention";
+        display_name: string;
+        login_name: string;
+        fallback_color: MessageColor;
+        user_color: MessageColor;
+    }
+
+    interface TimestampElementInit extends MessageElementInitBase {
+        type: "timestamp";
+        time?: number;
+    }
+
+    interface TwitchModerationElementInit extends MessageElementInitBase {
+        type: "twitch-moderation";
+    }
+
+    interface LinebreakElementInit extends MessageElementInitBase {
+        type: "linebreak";
+        flags?: MessageElementFlag;
+    }
+
+    interface ReplyCurveElementInit extends MessageElementInitBase {
+        type: "reply-curve";
+    }
+
+    enum MessageFlag {
+        None = 0,
+        System = 0,
+        Timeout = 0,
+        Highlighted = 0,
+        DoNotTriggerNotification = 0,
+        Centered = 0,
+        Disabled = 0,
+        DisableCompactEmotes = 0,
+        Collapsed = 0,
+        ConnectedMessage = 0,
+        DisconnectedMessage = 0,
+        Untimeout = 0,
+        PubSub = 0,
+        Subscription = 0,
+        DoNotLog = 0,
+        AutoMod = 0,
+        RecentMessage = 0,
+        Whisper = 0,
+        HighlightedWhisper = 0,
+        Debug = 0,
+        Similar = 0,
+        RedeemedHighlight = 0,
+        RedeemedChannelPointReward = 0,
+        ShowInMentions = 0,
+        FirstMessage = 0,
+        ReplyMessage = 0,
+        ElevatedMessage = 0,
+        SubscribedThread = 0,
+        CheerMessage = 0,
+        LiveUpdatesAdd = 0,
+        LiveUpdatesRemove = 0,
+        LiveUpdatesUpdate = 0,
+        AutoModOffendingMessageHeader = 0,
+        AutoModOffendingMessage = 0,
+        LowTrustUsers = 0,
+        RestrictedMessage = 0,
+        MonitoredMessage = 0,
+        Action = 0,
+        SharedMessage = 0,
+        AutoModBlockedTerm = 0,
+        ClearChat = 0,
+        EventSub = 0,
+        ModerationAction = 0,
+        InvalidReplyTarget = 0,
+    }
+
+    enum MessageElementFlag {
+        None = 0,
+        Misc = 0,
+        Text = 0,
+        Username = 0,
+        Timestamp = 0,
+        TwitchEmoteImage = 0,
+        TwitchEmoteText = 0,
+        TwitchEmote = 0,
+        BttvEmoteImage = 0,
+        BttvEmoteText = 0,
+        BttvEmote = 0,
+        ChannelPointReward = 0,
+        ChannelPointRewardImage = 0,
+        FfzEmoteImage = 0,
+        FfzEmoteText = 0,
+        FfzEmote = 0,
+        SevenTVEmoteImage = 0,
+        SevenTVEmoteText = 0,
+        SevenTVEmote = 0,
+        EmoteImages = 0,
+        EmoteText = 0,
+        BitsStatic = 0,
+        BitsAnimated = 0,
+        BadgeSharedChannel = 0,
+        BadgeGlobalAuthority = 0,
+        BadgePredictions = 0,
+        BadgeChannelAuthority = 0,
+        BadgeSubscription = 0,
+        BadgeVanity = 0,
+        BadgeChatterino = 0,
+        BadgeSevenTV = 0,
+        BadgeFfz = 0,
+        Badges = 0,
+        ChannelName = 0,
+        BitsAmount = 0,
+        ModeratorTools = 0,
+        EmojiImage = 0,
+        EmojiText = 0,
+        EmojiAll = 0,
+        AlwaysShow = 0,
+        Collapsed = 0,
+        Mention = 0,
+        LowercaseLinks = 0,
+        RepliedMessage = 0,
+        ReplyButton = 0,
+        Default = 0,
+    }
+
+    enum FontStyle {
+        Tiny,
+        ChatSmall,
+        ChatMediumSmall,
+        ChatMedium,
+        ChatMediumBold,
+        ChatMediumItalic,
+        ChatLarge,
+        ChatVeryLarge,
+        TimestampMedium,
+        UiMedium,
+        UiMediumBold,
+        UiTabs,
+        EndType,
+        ChatStart,
+        ChatEnd,
+    }
+
+    enum MessageContext {
+        Original,
+        Repost,
+    }
 }