export declare const ALERT_LEVELS: readonly ["normal", "alert", "warn", "alarm", "emergency"];
export declare const DEFAULT_ALERT_LEVELS: readonly ["alert", "warn", "alarm", "emergency"];
export declare const DEFAULT_SLACK_CHANNEL = "#alert";
export declare const DEFAULT_SLACK_TITLE = "Signal K notifications to Slack";
export declare const FALLBACK_DISPLAY_VALUE = "n/a";
export declare const NOTIFICATION_PREFIX = "notifications.";
export declare const NOTIFICATION_SUBSCRIPTION: {
    readonly context: "vessels.self";
    readonly subscribe: readonly [{
        readonly path: "notifications.*";
        readonly policy: "instant";
    }];
};
export declare const SEND_DELAY_MS = 1000;
export type AlertLevel = (typeof ALERT_LEVELS)[number];
export type Unsubscribe = () => void;
export type StatusSetter = (message: string) => void;
export type ScheduledHandle = ReturnType<typeof setTimeout>;
export interface PluginOptions {
    webhook: string;
    slackTitle?: string;
    slackChannel?: string;
    alertLevels?: readonly AlertLevel[];
}
export interface NormalizedPluginOptions extends PluginOptions {
    slackTitle: string;
    slackChannel: string;
}
export interface SignalKDelta {
    updates?: unknown;
}
export interface SignalKPathData {
    value?: unknown;
    meta?: {
        units?: unknown;
    } | null;
    timestamp?: unknown;
}
export interface SignalKSubscription {
    context: 'vessels.self';
    subscribe: readonly [
        {
            path: 'notifications.*';
            policy: 'instant';
        }
    ];
}
export interface SubscriptionManager {
    subscribe(subscription: SignalKSubscription, unsubscribes: Unsubscribe[], onError: (error: unknown) => void, onDelta: (delta: SignalKDelta) => void): void;
}
export interface SignalKApp {
    debug(message: string): void;
    error(message: string): void;
    setPluginStatus?: StatusSetter;
    setProviderStatus?: StatusSetter;
    subscriptionmanager: SubscriptionManager;
    getSelfPath(path: string): SignalKPathData;
    emit(eventName: 'connectionwrite', payload: {
        providerId: string;
    }): void;
}
export interface SlackFields {
    [key: string]: string;
    'Signal K path': string;
    State: string;
    Message: string;
    Value: string;
    Timestamp: string;
}
export interface SlackMessage {
    channel: string;
    text: string;
    fields: SlackFields;
}
export interface SlackNotifier {
    send(message: SlackMessage): Promise<void>;
}
export interface FormattedMeasurement {
    valueText: string;
    unitLabel: string;
}
export interface ParsedNotification {
    notificationPath: string;
    dataPath: string;
    state: string;
    message: string;
    timestamp: string;
}
export interface PluginDependencies {
    createSlackNotifier(webhookUrl: string): SlackNotifier;
    schedule(callback: () => void, delayMs: number): ScheduledHandle;
    cancelSchedule(handle: ScheduledHandle): void;
    emitAsync(callback: () => void): void;
}
export interface PluginSchema {
    type: 'object';
    required: readonly ['webhook'];
    properties: {
        webhook: {
            type: 'string';
            title: string;
        };
        slackTitle: {
            type: 'string';
            title: string;
        };
        slackChannel: {
            type: 'string';
            title: string;
            default: string;
        };
        alertLevels: {
            type: 'array';
            title: string;
            description: string;
            uniqueItems?: true;
            items: {
                type: 'string';
                enum: readonly AlertLevel[];
            };
            default: readonly AlertLevel[];
        };
    };
}
export interface SignalKPlugin {
    id: string;
    name: string;
    description: string;
    start(options: PluginOptions): void;
    stop(): void;
    schema: PluginSchema;
    uiSchema?: {
        alertLevels: {
            'ui:widget': 'checkboxes';
        };
    };
}