Reliability fixes for `default-branch-button` (#6629)

1 files changed, 13 insertions, 0 deletions

diff --git a/source/github-helpers/is-default-branch.ts b/source/github-helpers/is-default-branch.ts
new file mode 100644
index 00000000..82ef0be1
--- /dev/null
+++ b/source/github-helpers/is-default-branch.ts
@@ -0,0 +1,13 @@
+import getDefaultBranch from './get-default-branch.js';
+import getCurrentGitRef from './get-current-git-ref.js';
+
+/** Detects if the current view is on the default branch. To be used on file/folder/commit lists */
+export default async function isDefaultBranch(): Promise<boolean> {
+	const currentBranch = getCurrentGitRef();
+	if (!currentBranch) {
+		// This happens on the repo root OR on views that are not branch-specific (like isIssue)
+		return true;
+	}
+
+	return currentBranch === await getDefaultBranch();
+}