Changing a buffer from a ReadStream into an actual file

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Ok this saved my life: https://youtu.be/pXHOF4GWuZQ. This is the final code:

downloadFile(file_id) {
    return new Promise((resolve, reject) => {
        var mongoose = require('mongoose');
        var Grid = require('gridfs-stream');
        var fs = require('fs');

        mongoose.connect(config.db, {useNewUrlParser: true},).catch(e => console.log(e));
        var conn = mongoose.connection;
        Grid.mongo = mongoose.mongo;
        var gfs = Grid(conn.db);
        console.log('downloadfile', file_id);
        var read_stream = gfs.createReadStream({_id: file_id});
        let file = [];
        read_stream.on('data', function (chunk) {
            file.push(chunk);
        });
        read_stream.on('error', e => {
            console.log(e);
            reject(e);
        });
        return read_stream.on('end', function () {
            file = Buffer.concat(file);
            const img = `data:image/png;base64,${Buffer(file).toString('base64')}`;
            resolve(img);
        });
    });
}

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