import './dispose-polyfill';
/**
 * The field in `detail` that needs to be set to `true` in order to send this to telemetry.
 */
export declare const TELEMETRY_FIELD = "telemetry";
/**
 * The field in `detail` that needs to be set to `true` in order to skip this for counting
 */
export declare const SKIPCOUNT_FIELD = "skipCount";
export interface ProfileOptions {
    /**
     * Whether to include the given profiling information in the report that the CLI sends for telemetry.
     *
     * @default false
     */
    readonly telemetry?: boolean;
    /**
     * If set to true, do not increment the counter by `1`
     *
     * This is a trick for if multiple distinct spans should be counted together as time for a single
     * conceptual invocation. Used for bundling, use sparingly.
     *
     * @default false
     */
    readonly skipCount?: boolean;
}
/**
 * Make a decorator that will profile a given function.
 *
 * Emits a measurementto the performance timeline, potentially with `{ telemetry: true }` in
 * the `detail` field.
 *
 * If a profiled function is called from another profiled function, only the
 * top-level call is accounted for.
 */
export declare function profileFn(key: string, options?: ProfileOptions): <A extends Function>(fn: A) => A;
/**
 * Profile a block by returning a disposable that will emit a (non-exclusive) counter when disposed
 *
 * Recommended way of using this:
 *
 * ```ts
 * using _span = profileSpan('span-name', { telemetry: true });
 * ```
 */
export declare function profileSpan(key: string, options?: ProfileOptions): Disposable;
/**
 * Make all functions on this given object (exclusively) profiled
 */
export declare function profileObj(objName: string, options?: ProfileOptions): <A extends object>(obj: A) => A;
type ArbitraryConstructor = {
    new (...args: any[]): {};
};
/**
 * Make all functions on this given class (exclusively) profiled
 */
export declare function profileClass<A extends ArbitraryConstructor>(cls: A, options?: ProfileOptions): A;
export interface PerfCounter {
    count: number;
    total: number;
}
export type PerfCounters = Record<string, PerfCounter>;
export interface ReadCountersOptions {
    /**
     * Whether to read only counters emitted for telemetry.
     *
     * If set to `false`, all counters are read.
     *
     * @default false
     */
    readonly telemetry?: boolean;
    /**
     * Return at most the top N entries.
     *
     * @default - All entries
     */
    readonly n?: number;
}
/**
 * Read measurements from the performance timeline and return them as counters
 *
 * Returns an ordered map, with the counters with the highest durations first.
 */
export declare function readPerfCounters(options?: ReadCountersOptions): PerfCounters;
/**
 * Print a table of the performance counters
 *
 * This can be used for local debugging and performance analysis.
 */
export declare function printPerfCounters(options?: ReadCountersOptions): void;
export {};