/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */
import type { ITelemetryGenericEventExt, TelemetryLoggerExt } from "./telemetryTypesUndeprecated.js";
/**
 * Telemetry class that accumulates measurements which are eventually logged in a telemetry event through the provided
 * {@link TelemetryEventBatcher.logger | logger} when the number of calls to the function reaches the specified {@link TelemetryEventBatcher.threshold | threshold}.
 *
 * @remarks It is expected to be used for a single event type. If different properties should be logged at different times, a separate `TelemetryEventBatcher` should be created with separate `TMetrics` type.
 * @typeparam TMetrics - The set of keys that should be logged.
 * E.g., `keyof Foo` for logging properties `bar` and `baz` from `type Foo = { bar: number, baz: number }`.
 *
 * @sealed
 * @internal
 */
export declare class TelemetryEventBatcher<TMetrics extends string> {
    /**
     * Custom properties to include in the telemetry performance event when it is written.
     */
    private readonly eventBase;
    /**
     * The logger to use to write the telemetry performance event.
     */
    private readonly logger;
    /**
     * The number of logs to accumulate before sending the data to the logger.
     */
    private readonly threshold;
    /**
     * Stores the sum of the custom data passed into the logger.
     */
    private dataSums;
    /**
     * Stores the maximum value of the custom data passed into the logger.
     */
    private dataMaxes;
    /**
     * Counter to keep track of the number of times the log function is called.
     */
    private counter;
    constructor(
    /**
     * Custom properties to include in the telemetry performance event when it is written.
     */
    eventBase: ITelemetryGenericEventExt, 
    /**
     * The logger to use to write the telemetry performance event.
     */
    logger: TelemetryLoggerExt, 
    /**
     * The number of logs to accumulate before sending the data to the logger.
     */
    threshold: number);
    /**
     * Accumulates the custom data and sends it to the logger every {@link TelemetryEventBatcher.threshold} calls.
     *
     * @param customData - A record storing the custom data to be accumulated and eventually logged.
     */
    accumulateAndLog(customData: Record<TMetrics, number>): void;
    private sendData;
}
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