This project is part of the @thi.ng/umbrella monorepo.
File output handler for structured, multilevel & hierarchical loggers based on @thi.ng/rstream. This is a support package for @thi.ng/rstream-log.
STABLE - used in production
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yarn add @thi.ng/rstream-log-fileES module import:
<script type="module" src="https://cdn.skypack.dev/@thi.ng/rstream-log-file"></script>For Node.js REPL:
# with flag only for < v16
node --experimental-repl-await
> const rstreamLogFile = await import("@thi.ng/rstream-log-file");
Package sizes (gzipped, pre-treeshake): ESM: 130 bytes
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();Karsten Schmidt
If this project contributes to an academic publication, please cite it as:
@misc{thing-rstream-log-file,
title = "@thi.ng/rstream-log-file",
author = "Karsten Schmidt",
note = "https://thi.ng/rstream-log-file",
year = 2017
}© 2017 - 2021 Karsten Schmidt // Apache Software License 2.0