diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 0000000..60c9dee
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,30 @@
+import {Changes} from './schemas'
+
+export function groupDependenciesByManifest(
+  changes: Changes
+): Map<string, Changes> {
+  const dependencies: Map<string, Changes> = new Map()
+  for (const change of changes) {
+    const manifestName = change.manifest
+
+    if (dependencies.get(manifestName) === undefined) {
+      dependencies.set(manifestName, [])
+    }
+
+    dependencies.get(manifestName)?.push(change)
+  }
+
+  return dependencies
+}
+
+export function getManifestsSet(changes: Changes): Set<string> {
+  return new Set(changes.flatMap(c => c.manifest))
+}
+
+export function renderUrl(url: string | null, text: string): string {
+  if (url) {
+    return `<a href="${url}">${text}</a>`
+  } else {
+    return text
+  }
+}