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util.inherits does not establish prototype chain Β· Issue #4179 Β· nodejs/node Β· GitHub
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docIssues and PRs related to the documentations.Issues and PRs related to the documentations.utilIssues and PRs related to the built-in util module.Issues and PRs related to the built-in util module.
Description
In inherits.js Object.setPrototypeOf is being called with the wrong parameters.
The reason for me assuming that the wrong parameters are being used is
(REPL)
> function MyError() {}
> util.inherits(MyError, Error);
> MyError
{ [Function: MyError]
super_:
{ [Function: Error]
captureStackTrace: [Function: captureStackTrace],
stackTraceLimit: 10 } }
> Error.isPrototypeOf(MyError);
false
While inheritance sort of works, the prototype chain is actually never established.
> myerr = new MyError()
[Error]
> myerr instanceof MyError
true
> myerr instanceof Error
true
Replacing the existing call to Object.setPrototypeOf() by
Object.setPrototypeOf(ctor, superCtor);
See https://github.com/nodejs/node/blob/master/lib/util.js#L805.
(REPL)
> function MyError() {}
> util.inherits(MyError, Error);
> MyError
[Function: OError]
> Error.isPrototypeOf(MyError);
true
Yet, instanceof will now fail
> myerr = new MyError()
[Error]
> myerr instanceof MyError
true
> myerr instanceof Error
false
When using the new class feature, everything works as expected, though
(REPL)
> class MyError extends Error {}
[Function: MyError]
> Error.isPrototypeOf(MyError)
true
> myerr = new MyError()
[Error]
> myerr instanceof MyError
true
> myerr instanceof Error
true
nVitius, Beim, Callidon, titarenko, cedx and 4 more
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docIssues and PRs related to the documentations.Issues and PRs related to the documentations.utilIssues and PRs related to the built-in util module.Issues and PRs related to the built-in util module.
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