Typescript: constructor with named arguments

sample.ts

class ConstructorArgs {
  namespace: string[] = ["default", "values"]
}
class Base extends ConstructorArgs {
    constructor(opts: ConstructorArgs = new ConstructorArgs) {
        super()
        Object.assign(this, opts)
    }
}

const x = new Base
console.log(x.namespace) // ["default", "values"] 

const y = new Base({ namespace: ["abc"] })
console.log(y.namespace) // ["abc"]