Function once

once<Args extends unknown[], R>(fn: (...args: Args) => R): (...args: Args) => R
Returns a wrapper that calls fn only on the first invocation. All subsequent calls return the cached result of the first call.
Type Parameters
- Args extends unknown[]
- R
Parameters
- fn: (...args: Args) => R
  The function to wrap.
Returns (...args: Args) => R
Example
```
const init = once(() => createConnection())
init() // creates connection
init() // returns cached connection
```
- Defined in function/once/index.ts:14