angular-nevera-generator/generators/service/templates/src/app/service.ts

Yeoman AngularJS scaffold a webapp with Angular 1 written in ES6 (Babel), TypeScript through Webpack or SystemJS including tools Gulp 4, ESLint, Browsersync and Karma

class <%- serviceName %> {
  getData() {
    return 1 + 2;
  }
}

<% if (modules === 'inject') { -%>
<% include inject/service.ts %>
<% } else { -%>
<% include modules/service.ts %>
<% } -%>