Blame · FileLogger.ts

b69ab31	1	/**
b69ab31	2	* Copyright (c) Meta Platforms, Inc. and affiliates.
b69ab31	3	*
b69ab31	4	* This source code is licensed under the MIT license found in the
b69ab31	5	* LICENSE file in the root directory of this source tree.
b69ab31	6	*/
b69ab31	7
b69ab31	8	import type {Level} from './logger';
b69ab31	9
b69ab31	10	import fs from 'node:fs';
b69ab31	11	import util from 'node:util';
b69ab31	12	import {Logger} from './logger';
b69ab31	13
b69ab31	14	/** Logger that outputs to a given filename.
b69ab31	15	* Typically used for browser ISL's server. */
b69ab31	16	export class FileLogger extends Logger {
b69ab31	17	constructor(public filename: string) {
b69ab31	18	super();
b69ab31	19	}
b69ab31	20
b69ab31	21	write(level: Level, timeStr: string, ...args: Parameters<typeof console.log>): void {
b69ab31	22	const str = util.format(timeStr, this.levelToString(level), ...args) + '\n';
b69ab31	23	void fs.promises.appendFile(this.filename, str);
b69ab31	24	}
b69ab31	25
b69ab31	26	getLogFileContents() {
b69ab31	27	return fs.promises.readFile(this.filename, 'utf-8');
b69ab31	28	}
b69ab31	29	}