Hold the shipped source to ECMAScript alone, and run the suite on Deno and Bun

ci.sh

@@ -2,13 +2,15 @@
 set -euo pipefail
 cd "$(dirname "$0")"
 
-image=node:24.19.0-alpine3.24
-in_node() { docker run --rm -u "$(id -u):$(id -g)" -e HOME=/tmp -v "$PWD:/app" -w /app "$image" "$@"; }
+bun_image=oven/bun:1.4.0-alpine
+deno_image=denoland/deno:2.9.6
+node_image=node:24.19.0-alpine3.24
+in_image() { docker run --rm -u "$(id -u):$(id -g)" -e HOME=/tmp -v "$PWD:/app" -w /app --entrypoint "$2" "$1" "${@:3}"; }
 
-in_node npm ci
-in_node npm run typecheck
+in_image "$node_image" npm ci
+in_image "$node_image" npm run typecheck
 
-if ! test_output=$(in_node npm test 2>&1); then
+if ! test_output=$(in_image "$node_image" npm test 2>&1); then
   printf '%s\n' "$test_output"
   exit 1
 fi
@@ -17,3 +19,6 @@ if printf '%s' "$test_output" | grep -q 'ℹ tests 0'; then
   echo 'the gate ran zero tests — failing instead of a vacuous green'
   exit 1
 fi
+
+in_image "$deno_image" deno test --allow-read --no-check src/
+in_image "$bun_image" bun test