Yeoman Generator Overwrite without Prompt

gistfile1.txt

class extends Generator {
  writing() {
    // enable force overwrite
    this.conflicter.force = true;

    this.fs.copyTpl(
      this.templatePath('_package.json'),
      this.destinationPath('package.json'),
      { appname: 'your_appname' }
    );
  }
}