Marking Class Properties as Mutable in Effect Typescript

class Thing extends Schema.Class<Thing>('Thing')({
  property: Schema.String.pipe(Schema.mutable)
}) {
  public update() {
    this.property = "New Value"
      // ^ error TS2540: Cannot assign to 'property' because it is a read-only property.
  }
}

class Thing extends Schema.Class<Thing>('Thing')({
  property: Schema.String.pipe(Schema.mutable)
}) {
  public update() {
    this.property = "New Value"
      // ^ error TS2540: Cannot assign to 'property' because it is a read-only property.
  }
}