aws-upload.js

const AWS = require("aws-sdk");
const fs = require("fs");
const path = require("path");
const mime = require('mime');
const rootFolderName = process.env.BUILD_DIRECTORY || 'dist'
// configuration
const config = {
    s3BucketName: process.env.BUCKET_NAME,
    folderPath: `./${rootFolderName}` // path relative script's location
};

// initialize S3 client
const s3Config = {
    signatureVersion: 'v4',
    accessKeyId: process.env.AWS_ACCESS_KEY_ID,
    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY
}
const s3 = new AWS.S3(s3Config);

//remove this log in production
// Github show  **** instead of your keys(some privacy things), so dont panic if you see your password like that.
console.log('s3 config ', s3Config)

// resolve full folder path
const distFolderPath = path.join(__dirname, config.folderPath);

uploadDirectoryFiles(distFolderPath)

function uploadDirectoryFiles(distFolderPath) {
    const files = fs.readdirSync(distFolderPath)
    if (!files || files.length === 0) {
        console.log(`provided folder '${distFolderPath}' is empty or does not exist.`);
        return;
    }
    for (const fileName of files) {
        // get the full path of the file
        const filePath = path.join(distFolderPath, fileName);
        // If it was directory recursively call this function again
        if (fs.lstatSync(filePath).isDirectory()) {
            uploadDirectoryFiles(filePath)
            continue;
        }
        uploadFile(filePath, fileName)
    }

}

function uploadFile(filePath, fileName) {
    const relativeFilePath = `${__dirname}/${rootFolderName}/`
    const fileKey = filePath.replace(relativeFilePath, '')
    console.log({fileName, filePath, fileKey})
    const fileContent = fs.readFileSync(filePath)
    // upload file to S3
    const ContentType = mime.getType(filePath)
    s3.putObject({
        Bucket: config.s3BucketName,
        Key: fileKey,
        Body: fileContent,
        ContentType
    }, (err, res) => {
        if (err) {
            return console.log("Error uploading file ", err)
        }
        console.log(`Successfully uploaded '${fileKey}'!`, {res});
    });

}