Create pull-streams from web streams

fromReadable(readable) // → source
fromWritable(writable) // → sink → Promise
fromTransform(transform) // → through

import pull from 'https://esm.sh/pull-stream@3.7.0'
import {
    fromReadable,
    fromTransform,
    fromWritable,
} from 'https://deno.land/x/pull_stream_from_web@v1.0.0/index.js'

pull(
    fromReadable(Deno.stdin.readable),
    fromTransform(new TextDecoderStream()),
    pull.map((x) => x.toUpperCase()),
    fromTransform(new TextEncoderStream()),
    fromWritable(Deno.stdout.writable)
).catch(console.error)