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    Variable mapKeyAssertionConst

    mapKeyAssertion: AssertionFunctionSync<
        readonly [
            ZodCustom<Map<unknown, unknown>, Map<unknown, unknown>>,
            "to have key",
            ZodUnknown,
        ],
        (
            map: Map<unknown, unknown>,
            key: unknown,
        ) =>
            | { actual: unknown[]; expected: unknown[]; message: string }
            | undefined,
        readonly [
            ZodCustom<Map<unknown, unknown>, Map<unknown, unknown>>,
            PhraseLiteralSlot<"to have key">,
            ZodUnknown,
        ],
    > = ...

    Asserts that a Map has a specific key.

    const map = new Map([['key', 'value']]);
    expect(map, 'to have key', 'key'); // passes
    expect(map, 'to have key', 'missing'); // fails

    map-to-have-key-any

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