Function flatMap

flatMap<T, R>(fn: (chunk: T) => SyncOrAsync<R[]>): TransformStream<T, R>
Map and flatten stream chunks
Type Parameters
- T
- R
Parameters
- fn: (chunk: T) => SyncOrAsync<R[]>
  The transformation function that returns an array
Returns TransformStream<T, R>
A TransformStream that applies the transformation and flattens the result
Example
```
const stream = readable.pipeThrough(flatMap(word => word.split('')));
```
- Defined in index.ts:120