Show snapshot warnings in the summary

src/dependency-graph.ts

@@ -1,9 +1,14 @@
 import * as core from '@actions/core'
 import * as githubUtils from '@actions/github/lib/utils'
 import * as retry from '@octokit/plugin-retry'
-import {Changes, ChangesSchema} from './schemas'
+import {
+  ChangesSchema,
+  ComparisonResponse,
+  ComparisonResponseSchema
+} from './schemas'
 
 const retryingOctokit = githubUtils.GitHub.plugin(retry.retry)
+const SnapshotWarningsHeader = 'x-github-dependency-graph-snapshot-warnings'
 const octo = new retryingOctokit(
   githubUtils.getOctokitOptions(core.getInput('repo-token', {required: true}))
 )
@@ -18,14 +23,31 @@ export async function compare({
   repo: string
   baseRef: string
   headRef: string
-}): Promise<Changes> {
+}): Promise<ComparisonResponse> {
+  let snapshot_warnings = ''
   const changes = await octo.paginate(
-    'GET /repos/{owner}/{repo}/dependency-graph/compare/{basehead}',
     {
+      method: 'GET',
+      url: '/repos/{owner}/{repo}/dependency-graph/compare/{basehead}',
       owner,
       repo,
       basehead: `${baseRef}...${headRef}`
+    },
+    response => {
+      if (
+        response.headers[SnapshotWarningsHeader] &&
+        typeof response.headers[SnapshotWarningsHeader] === 'string'
+      ) {
+        snapshot_warnings = Buffer.from(
+          response.headers[SnapshotWarningsHeader],
+          'base64'
+        ).toString('utf-8')
+      }
+      return ChangesSchema.parse(response.data)
     }
   )
-  return ChangesSchema.parse(changes)
+  return ComparisonResponseSchema.parse({
+    changes,
+    snapshot_warnings
+  })
 }