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assert: accommodate ES6 classes that extend Error #4166

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assert: accommodate ES6 classes that extend Error #4166

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4 changes: 4 additions & 0 deletions lib/assert.js
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Original file line number Diff line number Diff line change
Expand Up @@ -278,6 +278,10 @@ function expectedException(actual, expected) {
// Ignore. The instanceof check doesn't work for arrow functions.
}

if (Error.isPrototypeOf(expected)) {
return false;
}

return expected.call({}, actual) === true;
}

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21 changes: 20 additions & 1 deletion test/parallel/test-assert.js
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Expand Up @@ -344,9 +344,28 @@ a.throws(makeBlock(thrower, TypeError), function(err) {
}
});

// https://github.com/nodejs/node/issues/3188
threw = false;

// GH-207. Make sure deepEqual doesn't loop forever on circular refs
try {
var ES6Error = class extends Error {};

var AnotherErrorType = class extends Error {};

const functionThatThrows = function() {
throw new AnotherErrorType('foo');
};

assert.throws(functionThatThrows, ES6Error);
} catch (e) {
threw = true;
assert(e instanceof AnotherErrorType,
`expected AnotherErrorType, received ${e}`);
}

assert.ok(threw);

// GH-207. Make sure deepEqual doesn't loop forever on circular refs
var b = {};
b.b = b;

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