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    Variable errorMessageAssertionConst

    errorMessageAssertion: AssertionFunctionSync<
        readonly [ZodCustom<Error, Error>, "to have message", ZodString],
        (
            subject: Error,
            expectedMessage: string,
        ) => { actual: string; expected: string; message: string } | undefined,
        readonly [
            ZodCustom<Error, Error>,
            PhraseLiteralSlot<"to have message">,
            ZodString,
        ],
    > = ...

    Assertion for testing if an Error has a specific message.

    expect(new Error('oops'), 'to have message', 'oops'); // passes
    expect(new Error('oops'), 'to have message', 'wrong'); // fails