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I was just hit by the issue when enabling this new option that looks good!
Thanks for already fixing it, but I'm a bit afraid the isUnion check can lead to issues, for example does default will be allow with: number | string switch or with "A" | "B" | string? Ideally what you want is to be able to detect if the switch type is finite or not

@ArnaudBarre You are right, I will add the following "allow" test to address this:

    // switch with default clause on primitive +
    // "allowDefaultCaseForExhaustiveSwitch" option
    {
      code: `
declare const value: number | string;
switch (value) {
  case 0:
    return 0;
  case 1:
    return 1;
  default:
    return -1;
}
      `,
      options: [
        {
          allowDefaultCaseForExhaustiveSwitch: false,
          requireDefaultForNonUnion: false,
        },
      ],
    },

In order to address this, I added a new prop to the metadata called containsNonLiteralType.