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

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This is the solution :

First, require readline : 

var readline = require('readline');

Then, use cursorTo like this : 

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

I’ve commented clearLine, since it’s useless in my case (cursorTo move back the cursor to the start)

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