JSFiddle - React, Tailwind, and code Playground

by Robodude

Babel + JSX

function readonly(target, name, descriptor) {
  descriptor.writable = false;
  return descriptor;
}

class Example {
  a() {}
  
  @readonly
  b() {}
}

const e = new Example();
e.a = 1;
e.b = 2;