/**
* @license
* Copyright 2020 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import type Debug from 'debug';
declare global {
const __PUPPETEER_DEBUG: string;
}
/**
* @internal
*/
export declare function importDebug(): Promise<typeof Debug>;
/**
* A debug function that can be used in any environment.
*
* @remarks
* If used in Node, it falls back to the
* {@link https://www.npmjs.com/package/debug | debug module}. In the browser it
* uses `console.log`.
*
* In Node, use the `DEBUG` environment variable to control logging:
*
* ```
* DEBUG=* // logs all channels
* DEBUG=foo // logs the `foo` channel
* DEBUG=foo* // logs any channels starting with `foo`
* ```
*
* In the browser, set `window.__PUPPETEER_DEBUG` to a string:
*
* ```
* window.__PUPPETEER_DEBUG='*'; // logs all channels
* window.__PUPPETEER_DEBUG='foo'; // logs the `foo` channel
* window.__PUPPETEER_DEBUG='foo*'; // logs any channels starting with `foo`
* ```
*
* @example
*
* ```
* const log = debug('Page');
*
* log('new page created')
* // logs "Page: new page created"
* ```
*
* @param prefix - this will be prefixed to each log.
* @returns a function that can be called to log to that debug channel.
*
* @internal
*/
export declare const debug: (prefix: string) => ((...args: unknown[]) => void);
/**
* @internal
*/
export declare function setLogCapture(value: boolean): void;
/**
* @internal
*/
export declare function getCapturedLogs(): string[];
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