Note
This is one of 200 standalone projects, maintained as part of the @thi.ng/umbrella monorepo and anti-framework.
🚀 Please help me to work full-time on these projects by sponsoring me on GitHub. Thank you! ❤️
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 in this package implements the
@thi.ng/logger
ILogger interface and uses LogLevel enums to configure levels /
filtering. See that package for more details.
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 - Basis types for arbitrary & hierarchical logging
yarn add @thi.ng/rstream-logESM import:
import * as rslog from "@thi.ng/rstream-log";Browser ESM import:
<script type="module" src="https://esm.run/@thi.ng/rstream-log"></script>For Node.js REPL:
const rslog = await import("@thi.ng/rstream-log");Package sizes (brotli'd, pre-treeshake): ESM: 753 bytes
Note: @thi.ng/api is in most cases a type-only import (not used at runtime)
import { LogLevel } from "@thi.ng/logger";
import { Logger, formatString, writeConsole } from "@thi.ng/rstream-log";
const logger = new Logger("main");
// or with min level
const logger = new Logger("main", LogLevel.DEBUG);
// or min level given as string
const logger = new Logger("main", "DEBUG");
// add console output w/ string formatter (a transducer)
// each logger instance has a rstream Stream instance
// allowing for downstream processing
logger.stream.transform(formatString()).subscribe(writeConsole());
logger.debug("hello world");
// [DEBUG] main: 2024-02-16T20:38:11.143Z hello world
logger.warn("eek");
// [WARN] main: 2024-02-16T20:38:11.144Z eek
// loggers can form hierarchies by creating/attaching child loggers
const child = logger.childLogger("child", LogLevel.INFO);
import { postWorker } from "@thi.ng/rstream";
// additionally send messages from this logger to worker
child.stream.subscribe(postWorker("log-worker.js"));
child.info("hi from submodule");
// [INFO] child: 2024-02-16T20:38:11.145Z hi from submoduleIf 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 - 2024 Karsten Schmidt // Apache License 2.0