This project is part of the @thi.ng/umbrella monorepo.
Structured, multilevel & hierarchical loggers based on @thi.ng/rstream.
This package provides extensible, multi-level & multi-hierarchy logging infrastructure, with logged values transformable via @thi.ng/transducers. Several built-in transformers are provided.
The Logger class provided by this package implements the
@thi.ng/api
ILogger interface and uses LogLevel enums to configure levels /
filtering.
STABLE - used in production
Search or submit any issues for this package
- @thi.ng/rstream-log-file - File output handler for structured, multilevel & hierarchical loggers based on @thi.ng/rstream
- @thi.ng/logger - Types & basis infrastructure for arbitrary logging (w/ default impls)
yarn add @thi.ng/rstream-logES module import:
<script type="module" src="https://cdn.skypack.dev/@thi.ng/rstream-log"></script>For Node.js REPL:
# with flag only for < v16
node --experimental-repl-await
> const rstreamLog = await import("@thi.ng/rstream-log");
Package sizes (gzipped, pre-treeshake): ESM: 845 bytes
- @thi.ng/api
- @thi.ng/checks
- @thi.ng/errors
- @thi.ng/logger
- @thi.ng/rstream
- @thi.ng/strings
- @thi.ng/transducers
import { LogLevel } from "@thi.ng/api";
import * as log from "@thi.ng/rstream-log";
const logger = new log.Logger("main");
// or with min level
const logger = new log.Logger("main", LogLevel.DEBUG);
// add console output w/ string formatter (a transducer)
logger.subscribe(log.writeConsole(), log.formatString());
logger.debug("hello world");
// [DEBUG] [main] 2018-01-20T09:04:05.198Z hello world
logger.warn("eek");
// [WARN] [main] 2018-01-20T09:04:16.913Z eek
// each logger instance is a rstream StreamMerge instance
// allowing to form logger hierarchies
const mod1 = new log.Logger("module-1", LogLevel.INFO);
// pipe mod1 into main logger
logger.add(mod1);
import { postWorker } from "@thi.ng/rstream";
// additionally send messages from this logger to worker
mod1.subscribe(postWorker("log-worker.js"));
mod1.info("hi from sub-module");
// only shown in console:
// [INFO] [module-1] 2018-01-20T09:05:21.198Z hi from sub-moduleTODO
Karsten Schmidt
If this project contributes to an academic publication, please cite it as:
@misc{thing-rstream-log,
title = "@thi.ng/rstream-log",
author = "Karsten Schmidt",
note = "https://thi.ng/rstream-log",
year = 2017
}© 2017 - 2021 Karsten Schmidt // Apache Software License 2.0