log-update
Log by overwriting the previous output in the terminal. Useful for rendering progress bars, animations, etc.
Last updated 5 months ago by sindresorhus .
MIT · Repository · Bugs · Original npm · Tarball · package.json
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log-update Build Status

Log by overwriting the previous output in the terminal.
Useful for rendering progress bars, animations, etc.

Install

$ npm install log-update

Usage

const logUpdate = require('log-update');

const frames = ['-', '\\', '|', '/'];
let i = 0;

setInterval(() => {
	const frame = frames[i = ++i % frames.length];

	logUpdate(
`
        ♥♥
   ${frame} unicorns ${frame}
        ♥♥
`
	);
}, 80);

API

logUpdate(text…)

Log to stdout.

logUpdate.clear()

Clear the logged output.

logUpdate.done()

Persist the logged output.
Useful if you want to start a new log session below the current one.

logUpdate.stderr(text…)

Log to stderr.

logUpdate.stderr.clear()

logUpdate.stderr.done()

logUpdate.create(stream, options?)

Get a logUpdate method that logs to the specified stream.

options

Type: object

showCursor

Type: boolean
Default: false

Show the cursor. This can be useful when a CLI accepts input from a user.

const logUpdate = require('log-update');

// Write output but don't hide the cursor
const log = logUpdate.create(process.stdout, {
	showCursor: true
});

Examples

  • listr - Uses this module to render an interactive task list
  • ora - Uses this module to render awesome spinners
  • speed-test - Uses this module to render a spinner

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