A microstate email form which stores its original value

form.js

class EmailForm {
  original = {};
  fields = {};
  
  initialize(value) {
    if (!value) {
      return {original: {}, fields: {}};
    }
    if (!value.fields) {
      return this.reset(); 
    }
    return value;
  }
  
  get isDirty() {
    return valueOf(this.original) !== valueOf(this.fields);
  }
  
  setEmail(value) {
    return this.fields.put('email', value);
  }
  
  setPassword(value) {
    return this.fields.put('password', value);
  }
  
  clear() {
    return this.fields.set(this.original);
  }
}