/** The event name sent for a track call whose event name is missing. */
export declare const MISSING_EVENT_NAME = "Missing Event Name";
export type DropReason = "queue full" | "send backlog full" | "internal error" | "unsent at exit" | "unconfirmed at exit";
export declare class AvoLog {
    static now: () => number;
    private static windows;
    private static exitListenerArmed;
    private static exiting;
    /** Events dropped because the unsent buffer or the send backlog is full. */
    static dropped(count: number, reason: DropReason): void;
    /** A batch answered with an HTTP status other than 200. Only the status is logged. */
    static rejected(status: number): void;
    /** A batch that could not be sent (network error, timeout, header guard). */
    static failed(error: unknown): void;
    /**
     * An internal error. Only its type is printed: the error may come from reading a property
     * (a throwing getter or proxy), so its message or stack can carry a property value.
     */
    static internal(error: unknown): void;
    private static readonly errorTypes;
    /** A track call without a usable event name, sent as MISSING_EVENT_NAME. */
    static missingEventName(): void;
    /** A streamId containing ':' (warned on every call before; now once per window). */
    static streamIdColon(): void;
    /**
     * A tracked InspectorEvent with keys the SDK does not know (a typo such as `outputRef` or
     * `eventname`). Only the key names are printed, JSON-quoted, at most
     * MAX_LOGGED_OPTION_KEYS of them, each cut to MAX_LOGGED_OPTION_KEY_LENGTH characters;
     * never a value.
     */
    static unknownEventKeys(keys: string[], known: string[]): void;
    /**
     * trackSchemaFromEvent called with something other than an InspectorEvent object, such
     * as a 1.x call with the event name first. Nothing about the argument is printed.
     */
    static notAnInspectorEvent(): void;
    /**
     * Prints every pending count and resets its key. With `onlyExpired` (flush()), only keys
     * whose window has expired; destroy() and the exit drain print them all.
     */
    static flushPending: (onlyExpired?: boolean) => void;
    private static names;
    private static noteNames;
    private static takeNames;
    private static occur;
    private static seconds;
    private static suffix;
    private static updateExitListener;
    private static onBeforeExit;
    private static onExit;
    private static write;
}