rc-js-util/docs/rc-js-util.once.md

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

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## Once() function

Method decorator. The target will be called only once, subsequent calls will return the first return.

**Signature:**

```typescript
export declare function Once<TInstance extends object, TKey extends keyof TInstance>(target: TInstance, key: TKey, descriptor: PropertyDescriptor): void;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td>

target


</td><td>

TInstance


</td><td>


</td></tr>
<tr><td>

key


</td><td>

TKey


</td><td>


</td></tr>
<tr><td>

descriptor


</td><td>

PropertyDescriptor


</td><td>


</td></tr>
</tbody></table>
**Returns:**

void