The map function used map items
The stream's options
The map function used map items
Event emitter The defined events on documents including:
the type of record passed down by previous streams
A utility method for creating Readable Streams out of iterators.
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A transform stream that flattens stream of iterables using the provided function
Readable .from([["a", "aa", "bbb"], ["dddd", "eeeee"], ["ffffff", "hhhhhhh"]]) .pipe(new FlatMap((item: string) => item.length)) .on("close", (chunks: number[]) => { console.log(chunks); // [1, 2, 3, 4, 5, 6, 7] });