import { InjectionToken } from "@nestjs/common/interfaces";
import { OptionalFactoryDependency } from "@nestjs/common/interfaces/modules/optional-factory-dependency.interface";
import * as client from "prom-client";
import { PrometheusContentType, RegistryContentType } from "prom-client";
import { PrometheusOptions } from "../interfaces";
/**
 * @internal
 */
export type Metrics = "Gauge" | "Summary" | "Histogram" | "Counter";
/**
 * @internal
 */
export type Options = client.GaugeConfiguration<string> | client.SummaryConfiguration<string> | client.CounterConfiguration<string> | client.HistogramConfiguration<string>;
/**
 * @internal
 */
export declare function getOrCreateMetric<T extends RegistryContentType = PrometheusContentType>(type: Metrics, options: Options, prometheusOptions?: PrometheusOptions<T>): client.Metric<string>;
/**
 * @public
 */
export type MetricProviderInject = Array<InjectionToken | OptionalFactoryDependency>;
/**
 * Additional options for metric providers that support dependency injection
 * into the `collect` function.
 *
 * @public
 */
export interface MetricProviderInjectable<T> {
    inject?: MetricProviderInject;
    collect?: (this: T, ...args: any[]) => void | Promise<void>;
}
/**
 * @public
 */
export declare function getToken(name: string): string;
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