Is it possible to have a private constructor in dart?

Question

I\'m able to do something like the following in TypeScript

class Foo {
  private constructor () {}
}

so this constructor is access

Answer 1

A method without any code must be something like this

class Foo {
  Foo._();
}

Answer 2

Just create a named constructor that starts with _

class Foo {
  Foo._() {}
}

then the constructor Foo._() will be accessible only from its class (and library).