Node.js: working with files: creating a basic helper class

Node.js provides us with a complete API to work with files.

We can create the following helper class:

'use strict';

const path = require('path');
const fs = require('fs');
const ABSPATH = path.dirname(process.mainModule.filename);

class Files {
    static read(path, encoding = 'utf8') {
      return new Promise((resolve, reject) => {
        let readStream = fs.createReadStream(ABSPATH + path, encoding);
        let data = '';
        
        readStream.on('data', chunk => {  
            data += chunk;
        }).on('end', () => {
            resolve(data);
        }).on('error', err => {
            reject(err);
        });
      });  
    }
    
    static create(path, contents) {
        return new Promise((resolve, reject) => {
            fs.writeFile(ABSPATH + path, contents, (err, data) => {
                if(!err) {
                    resolve(data);
                } else {
                    reject(err);
                }
            });
        });
    }

    static remove(path) {
        return new Promise((resolve, reject) => {
            fs.unlink(ABSPATH + path, err => {
                if(!err) {
                    resolve(path);
                } else {
                    reject(err);
                }
            });
        });
    }

    static exists(path) {
        return new Promise((resolve, reject) => {
            fs.access(ABSPATH + path, fs.constants.F_OK, err => {
               if(!err) {
                   resolve(true);
               } else {
                   reject(err);
               }
            });
        });
    }
}

module.exports = Files;

Example:

'use strict';

const Files = require('./lib/Files');

Files.create('/files/test.txt', 'Test').then(data => {
    console.log(data);
}).catch(err => {
    console.log(err);
});