JSFiddle - React, Tailwind, and code Playground

JavaScript

const app = {
      enums: {
        ROCK: 'ROCK',
        PAPER: 'PAPER',
        SCISSORS: 'SCISSORS',
        DEFAULT_USER_CHOICE: this.ROCK //default, take note of this keyword
      },
      prop: {
        isGameRunning: false,
        mySelection: app.enums.ROCK //ERROR LINE
      }
    };