BUPKIS
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    Variable emptyObjectAssertionConst

    emptyObjectAssertion: AssertionStandardSchemaSync<
        readonly [
            ZodRecord<
                ZodUnion<readonly [ZodString, ZodNumber, ZodSymbol]>,
                ZodUnknown,
            >,
            "to be empty",
        ],
        ZodRecord<ZodUnion<readonly [ZodString, ZodNumber, ZodSymbol]>, ZodUnknown>,
        readonly [
            ZodRecord<
                ZodUnion<readonly [ZodString, ZodNumber, ZodSymbol]>,
                ZodUnknown,
            >,
            PhraseLiteralSlot<"to be empty">,
        ],
    > = ...

    Asserts that an object is empty (has no own properties).

    expect({}, 'to be empty'); // passes
    expect({ key: 'value' }, 'to be empty'); // fails