JSFiddle - React, Tailwind, and code Playground

JavaScript

function NoStrict() {
  // Used when debugging some streamline.js generated things
  // can also end up relevant to JILS and CoffeeScript
  // have not had a case where this actually was used in practice outside of streamline.js
  return NoStrict.caller.toString().indexOf('_');
}

function Strict() {
  "use strict";
  return NoStrict();
}

try {
    Strict();
    console.log("Allowed to do that from strict mode");
}
catch(e) {
    console.error("Error cannot do that from a strict mode invocation");
}