assert.AssertionError

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Extends Error

Indicates the failure of an assertion. All errors thrown by the assert module will be instances of the AssertionError class.

Properties 5

any

Set to the actual argument for methods such as assert.strictEqual().

String

Value is always ERR_ASSERTION to show that the error is an assertion error.

any

Set to the expected value for methods such as assert.strictEqual().

Boolean

Indicates if the message was auto-generated (true) or not.

String

Set to the passed in operator value.

A subclass of Error that indicates the failure of an assertion.

Parameters
Parameters	Type	Description
options?	assert.AssertionError.options	options 5 fields actual any The `actual` property on the error instance. expected any The `expected` property on the error instance. message? String If provided, the error message is set to this value. operator String The `operator` property on the error instance. stackStartFn? Function If provided, the generated stack trace omits frames before this function.

Version13.4.1