diff --git a/.changeset/patch-configure-jsweep-node20-commonjs.md b/.changeset/patch-configure-jsweep-node20-commonjs.md
new file mode 100644
index 0000000000..2b4760bfd1
--- /dev/null
+++ b/.changeset/patch-configure-jsweep-node20-commonjs.md
@@ -0,0 +1,10 @@
+---
+"gh-aw": patch
+---
+
+Configure jsweep workflow to use Node.js v20 and compile JavaScript to CommonJS.
+
+This change documents that `jsweep.md` pins `runtimes.node.version: "20"` and
+updates `actions/setup/js/tsconfig.json` to emit CommonJS (`module: commonjs`) and
+target ES2020 (`target: es2020`) for the JavaScript files in `actions/setup/js/`.
+
diff --git a/.github/workflows/jsweep.lock.yml b/.github/workflows/jsweep.lock.yml
index 87fb345b0f..a9b1a05011 100644
--- a/.github/workflows/jsweep.lock.yml
+++ b/.github/workflows/jsweep.lock.yml
@@ -103,7 +103,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
         with:
-          node-version: '24'
+          node-version: '20'
           package-manager-cache: false
       - name: Setup Python
         uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
diff --git a/.github/workflows/jsweep.md b/.github/workflows/jsweep.md
index b76644646e..665bf4eecf 100644
--- a/.github/workflows/jsweep.md
+++ b/.github/workflows/jsweep.md
@@ -10,6 +10,9 @@ permissions:
   pull-requests: read
 tracker-id: jsweep-daily
 engine: copilot
+runtimes:
+  node:
+    version: "20"
 tools:
   serena: ["typescript"]
   github:
diff --git a/actions/setup/js/tsconfig.json b/actions/setup/js/tsconfig.json
index a14bda0052..5af1581e5e 100644
--- a/actions/setup/js/tsconfig.json
+++ b/actions/setup/js/tsconfig.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
-    "target": "es2022",
-    "module": "es2022",
-    "lib": ["es2022"],
+    "target": "es2020",
+    "module": "commonjs",
+    "lib": ["es2020"],
     "types": ["node"],
     "allowJs": true,
     "checkJs": true,
@@ -16,7 +16,7 @@
     "noImplicitThis": true,
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
-    "moduleResolution": "bundler",
+    "moduleResolution": "node",
     "allowSyntheticDefaultImports": true,
     "esModuleInterop": true,
     "skipLibCheck": true,