invalidation.js

// Part of a class
apply(compiler) {
    compiler.plugin('emit', (compilation, callback) => {
        this.valid = true
        for (var filename in compilation.assets) {
            if (this.valid) {
                this.upload(filename, filename.replace(compilation.options.theme, ''))
            }
        }
        console.log('upload done');
        callback()
    })
    compiler.plugin('invalid', () => {
        this.valid = false
    })
}

upload(from, to) {
    this.headers = {
        'Content-Type': 'application/octet-stream',
        'Content-Length': fs.statSync(from).size,
        'X-Scroll-Viewport-Resource-Location': to,
        'Authorization': ('Basic ' + new Buffer(this.username + ':' + this.password).toString('base64'))
    }
    fs.createReadStream(from).pipe(
        request(
            {
                url: this.baseUrl + this.restUrl.update,
                method: 'POST',
                headers: this.headers
            },
            function(error, response) {
                console.log(response.statusCode + ' for ' + to);
            }
        )
    )
}