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const util = require('util');
const assert = require('assert');
class deprecatedClass {
}
const deprecated = util.deprecate(deprecatedClass, 'deprecatedClass is deprecated.');
const instance = new deprecated();
const deprecatedInstance = new deprecatedClass();
assert(instance instanceof deprecated);
assert(instance instanceof deprecatedClass);
assert(deprecatedInstance instanceof deprecated);
assert(deprecatedInstance instanceof deprecatedClass);