Variable mapContainsAssertionConst

mapContainsAssertion: AssertionFunctionSync<
    readonly [
        ZodUnion<
            [
                ZodCustom<Map<unknown, unknown>, Map<unknown, unknown>>,
                ZodCustom<WeakMap<WeakKey, unknown>, WeakMap<WeakKey, unknown>>,
            ],
        >,
        readonly ["to contain", "to include"],
        ZodUnknown,
    ],
    (
        subject: Map<unknown, unknown> | WeakMap<WeakKey, unknown>,
        key: unknown,
    ) =>
        | { actual?: undefined; expected?: undefined; message: string }
        | { actual: unknown; expected: string; message: string }
        | undefined,
    readonly [
        ZodUnion<
            [
                ZodCustom<Map<unknown, unknown>, Map<unknown, unknown>>,
                ZodCustom<WeakMap<WeakKey, unknown>, WeakMap<WeakKey, unknown>>,
            ],
        >,
        PhraseLiteralChoiceSlot<readonly ["to contain", "to include"]>,
        ZodUnknown,
    ],
> = ...

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

const obj = {};
const weakMap = new WeakMap([[obj, 'value']]);
expect(weakMap, 'to contain', obj); // passes
expect(weakMap, 'to contain', 'string'); // fails (not an object)
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