feat(streams/unstable): toLines()

[BlackAsLight]

Closes #5071

Signature: toLines(readable: ReadableStream<Uint8Array>): ReadableStream<string>

Usage

import { toLines } from '@std/streams'

for await (const line of toLines((await Deno.open('./deno.json')).readable))
  console.log('-', line)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (96da26c) to head (7bfb4b7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5121   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files         475      476    +1     
  Lines       38464    38475   +11     
  Branches     5584     5584           
=======================================
+ Hits        37023    37034   +11     
  Misses       1399     1399           
  Partials       42       42           

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[iuioiua]

Thank you for your contribution! However, I'm still skeptical about whether this provides sufficient value to justify having it in the Standard Library (weak opinion).

[jsejcksn]

Since this is effectively a functional TransformStream pipe operation, should it accept a pipe options argument (ref: Deno, MDN)? Refer to #5071 (comment) for additional context.

[iuioiua]

I made a few tweaks. Now, LGTM.