ReferenceError: prompt is not defined

[dotfortun]

Exercises 12 and 13 always fail because prompt is not defined.

The error is:

ReferenceError: prompt is not defined

    > 1 | let guests = prompt('How many people are coming to your wedding?');
        |                                                                    ^
      2 |
      3 | function getPrice(guests){
      4 |     let cost = 0;

      at exercises/12-How_much_the_wedding_costs/app.js:1:1039
      at Object.<anonymous> (exercises/12-How_much_the_wedding_costs/app.js:110:4)
      at Object.load (../../home/node/.local/share/@learnpack/learnpack/node_modules/rewire/lib/moduleEnv.js:55:18)
      at internalRewire (../../home/node/.local/share/@learnpack/learnpack/node_modules/rewire/lib/rewire.js:49:15)
      at rewire (../../home/node/.local/share/@learnpack/learnpack/node_modules/rewire/lib/index.js:11:12)
      at Object.rewire (exercises/12-How_much_the_wedding_costs/tests.js:12:17)