From 86a5c7f645eb64e6b9d75a951f05b9169c4c176a Mon Sep 17 00:00:00 2001
From: Damian Krzeminski <pirxpilot@furkot.com>
Date: Sun, 8 Oct 2023 23:00:59 +0200
Subject: [PATCH] stream: add support for `deflate-raw` format to webstreams
 compression

this change makes `deflate-raw` a valid parameter for both
CompressionStream and DecompressionStream constructors

it makes node's implementation consistent with what modern browsers
support and what specification calls for

see: https://wicg.github.io/compression/#compression-stream
---
 doc/api/webstreams.md                               | 12 ++++++++++--
 lib/internal/webstreams/compression.js              | 10 ++++++++--
 test/parallel/test-whatwg-webstreams-compression.js |  2 +-
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/doc/api/webstreams.md b/doc/api/webstreams.md
index 6d75212aba4a3f..8f7634b9e17bf5 100644
--- a/doc/api/webstreams.md
+++ b/doc/api/webstreams.md
@@ -1420,9 +1420,13 @@ changes:
 
 <!-- YAML
 added: v17.0.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/50097
+    description: format now accepts `deflate-raw` value
 -->
 
-* `format` {string} One of either `'deflate'` or `'gzip'`.
+* `format` {string} One of `'deflate'`, `'deflate-raw'`, or `'gzip'`.
 
 #### `compressionStream.readable`
 
@@ -1454,9 +1458,13 @@ changes:
 
 <!-- YAML
 added: v17.0.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/50097
+    description: format now accepts `deflate-raw` value
 -->
 
-* `format` {string} One of either `'deflate'` or `'gzip'`.
+* `format` {string} One of `'deflate'`, `'deflate-raw'`, or `'gzip'`.
 
 #### `decompressionStream.readable`
 
diff --git a/lib/internal/webstreams/compression.js b/lib/internal/webstreams/compression.js
index 6cbaa3f3250e73..d912959e29fd23 100644
--- a/lib/internal/webstreams/compression.js
+++ b/lib/internal/webstreams/compression.js
@@ -35,13 +35,16 @@ class CompressionStream {
   #transform;
 
   /**
-   * @param {'deflate'|'gzip'} format
+   * @param {'deflate'|'deflate-raw'|'gzip'} format
    */
   constructor(format) {
     switch (format) {
       case 'deflate':
         this.#handle = lazyZlib().createDeflate();
         break;
+      case 'deflate-raw':
+        this.#handle = lazyZlib().createDeflateRaw();
+        break;
       case 'gzip':
         this.#handle = lazyZlib().createGzip();
         break;
@@ -80,13 +83,16 @@ class DecompressionStream {
   #transform;
 
   /**
-   * @param {'deflate'|'gzip'} format
+   * @param {'deflate'|'deflate-raw'|'gzip'} format
    */
   constructor(format) {
     switch (format) {
       case 'deflate':
         this.#handle = lazyZlib().createInflate();
         break;
+      case 'deflate-raw':
+        this.#handle = lazyZlib().createInflateRaw();
+        break;
       case 'gzip':
         this.#handle = lazyZlib().createGunzip();
         break;
diff --git a/test/parallel/test-whatwg-webstreams-compression.js b/test/parallel/test-whatwg-webstreams-compression.js
index c527fc1f13d10e..fb20801543bff6 100644
--- a/test/parallel/test-whatwg-webstreams-compression.js
+++ b/test/parallel/test-whatwg-webstreams-compression.js
@@ -38,7 +38,7 @@ async function test(format) {
   ]);
 }
 
-Promise.all(['gzip', 'deflate'].map((i) => test(i))).then(common.mustCall());
+Promise.all(['gzip', 'deflate', 'deflate-raw'].map((i) => test(i))).then(common.mustCall());
 
 [1, 'hello', false, {}].forEach((i) => {
   assert.throws(() => new CompressionStream(i), {