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
- @thi.ng/rstream-log-file - File output handler for structured, multilevel & hierarchical loggers based on @thi.ng/rstream
yarn add @thi.ng/rstream-log// ES module
<script type="module" src="https://unpkg.com/@thi.ng/rstream-log?module" crossorigin></script>
// UMD
<script src="https://unpkg.com/@thi.ng/rstream-log/lib/index.umd.js" crossorigin></script>Package sizes (gzipped, pre-treeshake): ESM: 736 bytes / CJS: 862 bytes / UMD: 933 bytes
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
© 2017 - 2020 Karsten Schmidt // Apache Software License 2.0