import { MetricReader } from "@opentelemetry/sdk-metrics";
export declare function waitFor(callback: () => boolean | void): Promise<void>;
/**
 * This is a test metric reader that uses an in-memory metric exporter and exposes a method to get the value of a metric given its name and attributes.
 *
 * This is useful for testing the values of metrics that are collected by the SDK.
 *
 * TODO: We may want to rethink how we access metrics (see `getMetricValue` method) to make it more flexible.
 */
declare class TestMetricReader extends MetricReader {
    private _exporter;
    protected onShutdown(): Promise<void>;
    protected onForceFlush(): Promise<void>;
    getMetricValue(name: string, attributes?: {
        [key: string]: string | number;
    }): Promise<number | import("@opentelemetry/sdk-metrics").Histogram | import("@opentelemetry/sdk-metrics").ExponentialHistogram | undefined>;
    collectAndExport(): Promise<void>;
}
export declare function createTestMetricReader(): TestMetricReader;
export declare function tearDownTestMetricReader(): void;
export {};
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