Playground editor does not use strict mode

[joshunrau]

In the following example, the playground does not report any error, despite TypeScript knowing that liveWith may be undefined, leading to a runtime error. We need to enable strictNullChecks at minimum.

export default defineInstrument({
  ...,
  content: {
    liveWith: {
      kind: 'set',
      label: {
        en: 'Who do you currently live with? (Check all that apply)',
        fr: "Avec qui habitez-vous présentement? (Cochez toutes les réponses qui s'appliquent)"
      },
      variant: 'listbox',
      options: {
        en: {
          alone: 'Alone',
          spouse: 'With spouse or partner',
          family: 'Family member(s)',
          friends: 'Friend(s)',
          community: 'Members of a community',
          other: 'Other (please specify)'
        },
        fr: {
          alone: 'Seul(e)',
          spouse: 'Avec votre conjoint',
          family: 'Avec un ou des membres de votre famille',
          friends: 'Avec un ou des amis',
          community: "Membres d'une communauté",
          other: 'Autre (veuillez préciser)'
        }
      }
    },
    liveWithSpecify: {
      kind: 'dynamic',
      deps: ['liveWith'],
      render: ({ liveWith }) => {
        if (!liveWith.has('other')) {
          return null;
        }
        return {
          kind: 'string',
          label: {
            en: 'Please specify:',
            fr: 'Veuillez préciser:'
          },
          variant: 'input'
        };
      }
    }
  },
  ...
});