How to use iterable-to-stream - 3 common examples

export function writeToFileIterable(filename: string, data: Iterable): fs.WriteStream {
    const sourceStream = iterableToStream(data);
    const writeStream = fs.createWriteStream(filename);
    const zip = filename.match(/\.gz$/) ? zlib.createGzip() : new stream.PassThrough();
    return sourceStream.pipe(zip).pipe(writeStream);
}

return new Promise((resolve) => {
            iterableToStream(words.map(a => a + '\n')).pipe(outputStream).on('finish', () => resolve());
        });
    });

notify('Create Trie', !!outputFile);
        const pOutputStream = createWriteStream(outputFile);
        notify(`Generating...`, !!outputFile);
        const lines = await fileToLines(filename);
        const toLower = lowerCase ? (a: string) => a.toLowerCase() : (a: string) => a;

        const wordsRx = lines
            .map(toLower)
            .map(a => a.trim())
            .filter(a => !!a);

        notify('Processing Trie');
        const root = wordsRx.reduce((node: Trie.TrieNode, word: string) => Trie.insert(word, node), {} as Trie.TrieNode);

        notify('Export Trie');
        const serialStream = iterableToStream(Trie.serializeTrie(root, (base - 0) || 32));
        const outputStream = await pOutputStream;
        return new Promise((resolve) => {
            serialStream.pipe(outputStream).on('finish', () => resolve());
        });
    });