node.js stdout clearline() and cursorTo() functions

Question

From a node.js tutorial, I see those two process.stdout functions :

process.stdout.clearLine();
process.stdout.cursorTo(0);

But I\'m using

Answer 1

The Readline module that is part of Node.js now provides readline.cursorTo(stream, x, y), readline.moveCursor(stream, dx, dy) and readline.clearLine(stream, dir) methods.

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With TypeScript, your code should look like this:

import * as readline from 'readline'
// import readline = require('readline') also works

/* ... */

function writeWaitingPercent(p: number) {
    readline.clearLine(process.stdout, 0)
    readline.cursorTo(process.stdout, 0, null)
    let text = `waiting ... ${p}%`
    process.stdout.write(text)
}

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The previous code will transpile into the following Javascript (ES6) code:

const readline = require('readline');

/* ... */

function writeWaitingPercent(p) {
    readline.clearLine(process.stdout, 0);
    readline.cursorTo(process.stdout, 0, null);
    let text = `waiting ... ${p}%`;
    process.stdout.write(text);
}

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As an alternative, you can use the following code for Javascript (ES6):

const readline = require('readline');

/* ... */

function waitingPercent(p) {
    readline.clearLine(process.stdout, 0)
    readline.cursorTo(process.stdout, 0)
    let text = `waiting ... ${p}%`
    process.stdout.write(text)
}