diff --git a/modules/javascript.sh b/modules/javascript.sh
new file mode 100755
index 0000000..5fedbd7
--- /dev/null
+++ b/modules/javascript.sh
@@ -0,0 +1,124 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "===================================="
+echo " Davidson CI - JavaScript/TypeScript"
+echo "===================================="
+
+JS_COUNT="${DAVIDSON_JS_COUNT:-0}"
+TS_COUNT="${DAVIDSON_TS_COUNT:-0}"
+TOTAL=$((JS_COUNT + TS_COUNT))
+
+if [ "$TOTAL" -eq 0 ]; then
+    echo "No JavaScript or TypeScript detected - skipping module"
+    exit 0
+fi
+
+echo
+echo "JavaScript files: $JS_COUNT"
+echo "TypeScript files: $TS_COUNT"
+echo
+
+# -------------------------
+# Dependencies
+# -------------------------
+
+echo "→ Node dependencies"
+
+if [ -f package-lock.json ]; then
+    npm ci
+elif [ -f package.json ]; then
+    echo "package.json found but no package-lock.json"
+else
+    echo "No package.json found"
+fi
+
+# -------------------------
+# JavaScript syntax
+# -------------------------
+
+echo
+echo "→ JavaScript syntax"
+
+if [ "$JS_COUNT" -gt 0 ]; then
+    find . \
+        -type f \
+        \( -name "*.js" -o -name "*.mjs" -o -name "*.cjs" \) \
+        -not -path "./node_modules/*" \
+        -print0 |
+    while IFS= read -r -d '' file; do
+        echo "Checking $file"
+        node --check "$file"
+    done
+else
+    echo "No JavaScript files - skipping syntax check"
+fi
+
+# -------------------------
+# TypeScript
+# -------------------------
+
+echo
+echo "→ TypeScript"
+
+if [ "$TS_COUNT" -gt 0 ]; then
+    if [ -f package.json ] && \
+       node -e "let p=require('./package.json'); process.exit(p.scripts?.typecheck ? 0 : 1)"
+    then
+        npm run typecheck
+    elif [ -x node_modules/.bin/tsc ]; then
+        npx tsc --noEmit
+    else
+        echo "TypeScript detected but no TypeScript checker configured"
+    fi
+else
+    echo "No TypeScript files - skipping"
+fi
+
+# -------------------------
+# ESLint
+# -------------------------
+
+echo
+echo "→ ESLint"
+
+if [ -f package.json ] && \
+   node -e "let p=require('./package.json'); process.exit(p.scripts?.lint ? 0 : 1)"
+then
+    npm run lint
+else
+    echo "No lint script - skipping"
+fi
+
+# -------------------------
+# Tests
+# -------------------------
+
+echo
+echo "→ JavaScript tests"
+
+if [ -f package.json ] && \
+   node -e "let p=require('./package.json'); process.exit(p.scripts?.test ? 0 : 1)"
+then
+    npm test
+else
+    echo "No test script - skipping"
+fi
+
+# -------------------------
+# Build
+# -------------------------
+
+echo
+echo "→ Frontend build"
+
+if [ -f package.json ] && \
+   node -e "let p=require('./package.json'); process.exit(p.scripts?.build ? 0 : 1)"
+then
+    npm run build
+else
+    echo "No build script - skipping"
+fi
+
+echo
+echo "JavaScript/TypeScript module completed successfully"