Overture JS – A powerful basis for building web applications(overturejs.com)

  const NameView = new Class({
    Extends: View,

    firstName: null,
    lastName: null,

    name: function () {
      return this.get('firstName') + ' ' + this.get('lastName');
    }.property('firstName', 'lastName'),
  });

  class NameView extends View {
    firstName: string;
    lastName: string;

    @property('firstName', 'lastName')
    get name (): string {
      return `${this.firstName} ${this.lastName}`;
    }
  }

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