Multiple file upload

//Multiple file upload with extension filtering and the file must contain a object that have a base64 data and size

 const fs = require('fs')

 //dot env file
 const DATA_URL = process.env.DATA_URL || "http://localhost:3030" //create the data url of file

const multipleImageFileUploader = (file, requireExtension) => { //here file contain a object which have a base64 property and size of that file and require extension contain a array
    let config = {
        dataUrl: DATA_URL, //set the default data url
        saveDirectory: `${__dirname}/../public`, //set the save directory of the data
        fileName: ``, //set the file name
    }
    let exportData = [];
    let finalExportData
    let checkExtension = fileFilter(file, requireExtension)
    const {extensionValidation} = checkExtension

    if(!extensionValidation){ //if one of the data's  extension is not validated then it will execute
        finalExportData =  {
            extensionValidation: false,
            fileUrl: null,
            fileAddStatus: false
        }
    }else{  //if all of the data's extension is validated then it will execute
        file.map(rawData => {
            const myFile = rawData //store the file here
            const {base64, size} = myFile //get the data from my data
            const dataExtension = base64.split(';')[0].split('/')[1]  //get the extension of my data
            const myBase64Data = base64.split(';base64,')[1] //get the base 64 data of my data
            const myFileName = `${config.fileName}${+new Date()}.${dataExtension}` //set the file new name
            const myDataUrl = `${config.dataUrl}/${myFileName}` //set the data new data url
            const saveDirectory = `${config.saveDirectory}/${myFileName}` //which folder does file have been saved
            // console.log(saveDirectory);
            // upload the file here
            fs.writeFile(saveDirectory, myBase64Data, {encoding: "base64"}, (err) => {
                if(err){
                    console.log(err);
                    return err
                }else{
                    console.log("File uploaded successfully");
                    exportData.push(myDataUrl) //store each data into a array
                }
            })
        })
        finalExportData = {
            extensionValidation: true,
            fileUrl: exportData,
            fileAddStatus: true
        }  //these data will be return
        return finalExportData
    }
    return finalExportData
}

const fileFilter = (file, extension) => { //here file and extension will be array
    const myFile = file //it will be an array
    let tracking = [] //track all extension filter boolean status true or false and store it to it

    myFile.map(data => {
        const {base64, size} = data //get the data from my data
        const dataExtension = base64.split(';')[0].split('/')[1]  //get the extension of my data
        const isValid = extension.find(val => val == dataExtension) //check that is it a valid extension or not
        if(isValid){
            tracking.push(true)
        }else{
            tracking.push(false)
        }
    })
    const isNotMatch = tracking.find(ele => ele == false) //find the false value from the tracking array
    if(isNotMatch == false){
        return {
            extensionValidation: false
        }
    }else{
        return{
            extensionValidation: true
        }
    }
}

module.exports = {multipleImageFileUploader}FileUploader}