<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [rc-js-util](./rc-js-util.md) &gt; [\_Map](./rc-js-util._map.md) &gt; [union](./rc-js-util._map.union.md)

## \_Map.union property

Returns a map with keys from both A and B. If both A and B have the same key the value from B will be used.

**Signature:**

```typescript
static readonly union: typeof mapUnion;
```

## Remarks

See [mapUnion()](./rc-js-util.mapunion.md)<!-- -->.