How to use the isError function from util

util.md?plain=1

GitHub: Amery2010/nodejs-api-doc-cn

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  // true
```


<div id="isError" class="anchor"></div>
## util.isError(object)

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util.md?plain=1

GitHub: linvinglor/node

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// false (without 'new' returns a String)
util.isDate({});
// Returns: false
```

### util.isError(object)
<!-- YAML
added: v0.6.0
deprecated: v4.0.0
-->

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msgpack5.js

GitHub: dangthai228/GameCaro

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if (shouldThrow && !actual) {
  fail(actual, expected, 'Missing expected exception' + message);
}

var userProvidedMessage = typeof message === 'string';
var isUnwantedException = !shouldThrow && util.isError(actual);
var isUnexpectedException = !shouldThrow && actual && !expected;

if ((isUnwantedException &&
    userProvidedMessage &&

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