if (conditionNames.has(conditionName)) {
        match = reducedValue[conditionName];
        break;
      }
Reduce an "exports"-like subpath value after asserting the passed
`conditionNames` in any nested conditions.

Returns `'no-match'` in the case that none of the asserted `conditionNames`
are matched.

See https://nodejs.org/docs/latest-v19.x/api/packages.html#conditional-exports.