feat(tool,ci): Add script for detecting dart:io usage

Signed-off-by: jld3103 <jld3103yt@gmail.com>

.github/workflows/neon.yml

@@ -19,3 +19,13 @@ jobs:
 
       - name: Find untested Neon APIs
         run: ./tool/find-untested-neon-apis.sh
+
+  dart-io-usage:
+    name: dart:io usage
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+
+      - name: Find dart:io usage
+        run: ./tool/find-dart-io-usage.sh

tool/find-dart-io-usage.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -euxo pipefail
+cd "$(dirname "$0")/.."
+
+dart_io_usage=("$(grep -r packages --include "*\.dart" -e "dart:io" -l | grep -v "/\.dart_tool/" | grep -v "/bin/" | grep -v "/test_driver/" || true)")
+
+if [[ -n "${dart_io_usage[*]}" ]]; then
+  printf "%s\n" "${dart_io_usage[@]}"
+  exit 1
+fi