Why does default parameter value not work?

Question

I have a function which grabs some stuff from a database. I want to set the function to accept a DBConnection string parameter and a ProductID parameter, but because this will rarely be provided I would like a set a default value. I tried the following:

const DBConfig = require('./db.config');
async function getProduct(DBConnection = DBConfig.SQLConnection, ProductID) {
    console.log(ProductID)       // says undefined
    await DBConnection.connect()
......
}

I call the above function from another file by doing this:

Product = await api.getProduct({ProductID: req.body.ProductID})

For some reason, doing the above does not work. That is, I always get undefined in the console for ProductID.

If I simply do the following, then I do get the correct ProductID value printing in the console:

const DBConfig = require('./db.config');
const DBConnection = DBConfig.SQLConnection,
async function getProduct(ProductID) {
        console.log(ProductID)       // prints in the console as { ProductID: '1234' }
        await DBConnection.connect()
    ......
    }

I am using Webpack with babel-loader. I don't think it is a transpilation issue but not sure. Any ideas? In my Webpack config I have this to handle js files:

 {
      test: /\.js$/,
        include: [ srcPath ],
      exclude: ['/node_modules/','/src/test'],
      use: {
        loader: 'babel-loader',
        options: {
          presets: ["@babel/preset-env"]  //Preset used for env setup
        }
      }
    }

Answer 1

I think you want the parameters of getProduct to be destructured:

function getProduct({DBConnection = DBConfig.SQLConnection, ProductID}) {
    ...
}

Then you can do:

Product = await api.getProduct({ProductID: req.body.ProductID})

Shouldn't be a webpack or babel issue