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

Question

RepoPilot · Accepted Answer

The `pLimit` function accepts the `concurrency` argument as either a **number** or an **object**.

**Number:** A positive integer representing the concurrency limit. According to the validation logic in [index.js:L123-L128], the value must be an integer greater than 0, or `Number.POSITIVE_INFINITY`.

**Object:** An options object with a `concurrency` property. The type definition for this is `Options`, which is defined in [index.d.ts:L91-L102] as:
```typescript
export type Options = {
	readonly concurrency: number;
	readonly rejectOnClear?: boolean;
};
```

This is shown in the main function signature at [index.d.ts:L89]:
```typescript
export default function pLimit(concurrency: number | Options): LimitFunction;
```

The implementation in [index.js:L3-L8] handles both cases—if `concurrency` is an object, it destructures the `concurrency` and optional `rejectOnClear` properties from it.

FOLLOW_UPS:
- What happens if you pass invalid concurrency values?
- How does the rejectOnClear option affect clearQueue behavior?
- Can you change concurrency after creating the limit function?