defaultParams.js

const creator = ({ variableHere = 'no', notHere = 'some-default' }) => {
    let myObject = {
        id: 'someId',
        ...(variableHere && { variableHere }),
        ...(notHere && { notHere }),
    };
    return myObject
}
let variableHere = 'yes'

let createdObject = creator({ variableHere })
// Result:
// { id: 'someId', variableHere: 'yes', notHere: 'some-default' }
let createdObject2 = creator({ variableHere, notHere: null })
// Result:
// { id: 'someId', variableHere: 'yes' }