import { type MeasurePlugin, type OnSamplingMeasure, type OnStartMeasure, type OnStopMeasure } from './index.js';
/**
 * Supported hooks to run measurements on
 */
export declare const hooks: readonly ["onTest", "onTestStep"];
export type Hooks = typeof hooks[number];
export declare const hookOrder: readonly ["onStart", "onSampling", "onStop"];
export type HookOrder = typeof hookOrder[number];
/**
 * All metrics implemented in the reporter
 */
export declare const metrics: readonly ["usedJsHeapSize", "totalJsHeapSize", "jsHeapSizeLimit", "powerInWatts", "allPerformanceMetrics", "heapDump"];
export type Metrics = typeof metrics[number];
/**
 * Common interface to define procedures to observe metrics
 */
export type MetricObserver = {
    name: string;
    plugins: MeasurePlugin[];
    onStart: OnStartMeasure;
    onSampling: OnSamplingMeasure;
    onStop: OnStopMeasure;
};
/**
 * Define which metric should regularly be requested
 */
export type MetricSampling = {
    samplingTimeoutInMilliseconds: number;
};
/**
 * Browsers that have been tested to work with performance metric extraction
 */
export declare const supportedBrowsers: readonly ["chromium", "webkit", "firefox"];
export type SupportedBrowsers = typeof supportedBrowsers[number];
/**
 * Restrict metrics to browsers as some don't expose APIs or
 * don't support extraction at all
 */
export declare const browsersSupportingMetrics: {
    readonly chromium: readonly ["usedJsHeapSize", "totalJsHeapSize", "allPerformanceMetrics", "heapDump"];
    readonly firefox: readonly [];
    readonly webkit: readonly [];
};
export type ChromiumSupportedMetrics = typeof browsersSupportingMetrics.chromium[number] & Metrics;
export type OptionsFileWrite = {
    outputDir: string;
    outputFile: string;
};
export type JsonWriter = {
    /**
     * Initialize writer
     *
     * @param options defines target output
     */
    initialize(options: OptionsFileWrite): void;
    /**
     * Create new entry of an object
     *
     * @param content
     */
    write(content: Record<any, any>): boolean;
    /**
     * Finish json stream
     */
    close(): void;
    /**
     * Delete created target
     */
    delete(): boolean;
};
/**
 * Customize the reporter with desired browser and (custom) metrics
 */
export type Options = {
    outputDir: string;
    outputFile: string;
    deleteOnFailure: boolean;
    customJsonWriter?: JsonWriter;
    browsers: {
        [browser in SupportedBrowsers]?: {
            [hook in Hooks]?: {
                metrics: Array<typeof browsersSupportingMetrics[browser][number] & Metrics>;
                customMetrics?: Record<string, MetricObserver>;
                sampleMetrics?: Record<string, MetricSampling>;
            };
        };
    };
};
export declare const defaultOptions: Options;