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

Constructors

new

AssertionError(options?: { message?: string | undefined; actual?: unknown | undefined; expected?: unknown | undefined; operator?: string | undefined; stackStartFn?: Function | undefined; })

Properties

actual: unknown

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

code: "ERR_ASSERTION"

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

expected: unknown

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

generatedMessage: boolean

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

operator: string

Set to the passed in operator value.