A gist showcasing Object.Assign simple assignment of a function's properties.

ObjectAssignSimpleAssignment.js

//=============================================================================
// Object.Assign 2                                                             
//=============================================================================


class Printer {
  static printLine() {
    console.log('============================================\n');
  }
}

Printer.printMessage = function(message) {
  console.log(message);
};

function Writer(){

}

Writer.writeMessage = function(message) {
  this.printMessage(message); 
};

Object.assign(Writer, Printer);
console.log(Writer.printLine); //Undefined
Writer.writeMessage("This is printer's static method."); //This is printer's static method.