feat: copy dependency graph visualizer from SES-shim (#1650)

.gitignore

@@ -59,3 +59,5 @@ bundle-*.js
 .DS_Store
 .vscode/
 .idea/
+
+/packages.png

scripts/graph.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# scripts/graph.sh generates packages.png, a visualization of the internal
+# package dependency graph.
+set -ueo pipefail
+DIR=$(dirname -- "${BASH_SOURCE[0]}")
+{
+    echo 'digraph {'
+    echo 'rankdir=LR'
+    cat "$DIR"/../packages/*/package.json | jq -r --slurp '
+        . as $all |
+        [.[] | {(.name): true}] | add as $locals |
+
+        $all[] |
+        .name as $from |
+        (.dependencies // {}) |
+        keys[] |
+        {$from, to: .} |
+        select($locals[.from] and $locals[.to]) |
+        "\"\(.from)\" -> \"\(.to)\""
+    '
+    echo '}'
+} | dot -Tpng > "$DIR"/../packages.png