rstream-log-file

@thi.ng/rstream-log-file

This project is part of the @thi.ng/umbrella monorepo.

• About
• Installation
• Dependencies
• Usage examples
• Authors
• License

About

File output handler for @thi.ng/rstream-log, providing structured, multilevel & hierarchical loggers based on @thi.ng/rstream. Node only package.

This feature was previously part of @thi.ng/rstream-log, but has been extracted to avoid build issues with bundlers. See that package for further usage info.

Installation

yarn add @thi.ng/rstream-log @thi.ng/rstream-log-file

Dependencies

• @thi.ng/rstream

Usage examples

import * as log from "@thi.ng/rstream-log";
import { writeFile } from "@thi.ng/rstream-log-file";

const logger = new log.Logger("main");

// add file output w/ post-filtering (only WARN or ERROR levels)
// and formatted as JSON
const writer = logger.transform(log.minLevel(log.Level.WARN), log.formatJSON()).subscribe(writeFile("main.log"));

logger.warn("eek!");

// appended to file:
// {"level":"WARN","id":"main","time":"2018-01-23T09:05:55.647Z","body":["eek!"]}

// optionally, cancel file writer
writer.done();

Authors

• Karsten Schmidt

License

© 2018 Karsten Schmidt // Apache Software License 2.0