Revert "upgrade to yarn 4 (#171)"

This reverts commit cba2cb5.

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
       # Integration tests are not yet ready to run in parallel
       max-parallel: 1
       matrix:
-        node: ['18', '20']
+        node: ['16', '18', '20']
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/pr.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node: ['18', '20']
+        node: ['14', '16', '18']
 
     steps:
       - uses: actions/checkout@v3

.gitignore

@@ -5,12 +5,4 @@ sample.js
 npm-debug.log
 env.sh
 /coverage
-
-.pnp.*
-.yarn/*
-!.yarn/patches
-!.yarn/plugins
-!.yarn/releases
-!.yarn/sdks
-!.yarn/versions
 .aider*

package.json

@@ -11,9 +11,10 @@
     "mp3"
   ],
   "author": "Tim Koschuetzki <tim@transloadit.com>",
-  "packageManager": "yarn@4.0.1",
+  "packageManager": "yarn@1.22.19+sha1.4ba7fc5c6e704fce2066ecbfb0b0d8976fe62447",
   "engines": {
-    "node": ">= 14.16"
+    "node": ">= 14.16",
+    "yarn": ">= 1.22.19"
   },
   "dependencies": {
     "debug": "^4.3.1",