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util: fix deprecated class prototype #8105

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util: fix deprecated class prototype #8105

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5 changes: 4 additions & 1 deletion lib/internal/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,10 @@ exports._deprecate = function(fn, msg) {
// The wrapper will keep the same prototype as fn to maintain prototype chain
Object.setPrototypeOf(deprecated, fn);
if (fn.prototype) {
Object.setPrototypeOf(deprecated.prototype, fn.prototype);
// Setting this (rather than using Object.setPrototype, as above) ensures
// that calling the unwrapped constructor gives an instanceof the wrapped
// constructor.
deprecated.prototype = fn.prototype;
}

return deprecated;
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3 changes: 3 additions & 0 deletions test/fixtures/deprecated-userland-class.js
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Expand Up @@ -7,6 +7,9 @@ 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);