What types does the main pLimit function expect for its concurrency argument?

Question

RepoPilot · Accepted Answer

The `pLimit` function accepts two types for its `concurrency` argument:

1. **`number`** — A direct concurrency limit value
2. **`object`** — An options object with a `concurrency` property

This is defined in [index.d.ts:L89], which shows:

```typescript
export default function pLimit(concurrency: number | Options): LimitFunction;
```

The `Options` type is specified in [index.d.ts:L91-L106], where `concurrency` is a required `number` property (minimum `1`), and there's an optional `rejectOnClear` boolean property.

The implementation in [index.js:L3-L8] handles both cases:

```javascript
export default function pLimit(concurrency) {
	let rejectOnClear = false;

if (typeof concurrency === 'object') {
		({concurrency, rejectOnClear = false} = concurrency);
	}
```

So you can call `pLimit(1)` with a number, or `pLimit({concurrency: 1, rejectOnClear: true})` with an options object.

FOLLOW_UPS:
- How does the concurrency limit affect task execution?
- What happens when clearQueue() is called with rejectOnClear?
- How can you change the concurrency limit after creation?