This is how I remove duplicate tracks in my music library

gistfile1.txt

const mm = require('music-metadata');
const fs = require('fs');
const files = fs.readFileSync('../New\ playlist.m3u').toString().split("\r\n");
let songs;

songsP = Promise.all(files.map(file =>mm.parseFile(file).then(v => ({...v, fileName: file})).catch(a => null)))
songsP.then(val => songs = val)
// make sure there are really duplicates in the list
songs = songs.filter(song => !!song).filter(song => song && songs.find(sonn => (song.common.title == sonn.common.title) && (song.fileName != sonn.fileName)))

lowQSongs = {} // title: {bitrate: number, fileName: string}

for (const song of songs) {
    const title = song.common.title;
    const bitrate = song.format.bitrate;
    const fileName = song.fileName;
    if (lowQSongs[title] && lowQSongs[title].bitrate < bitrate) {
        continue;
    }
    lowQSongs[title] = {bitrate, fileName};
}

Object.values(lowQSongs).map(a => a.fileName).forEach(f => fs.unlink(f, e => console.warn(e)))

This sure is some 12:30AM code quality if I've ever seen it