From 1e90413f6b592c1f6f1eaba5b0ffd3a498689748 Mon Sep 17 00:00:00 2001
From: Alexander Trakhimenok <533159+trakhimenok@users.noreply.github.com>
Date: Fri, 10 Jun 2022 19:23:43 +0100
Subject: [PATCH] feat(core): throw graceful error in runNxMigration() if no
 collection (#10655)

---
 packages/nx/src/command-line/migrate.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/nx/src/command-line/migrate.ts b/packages/nx/src/command-line/migrate.ts
index 6f457ecb03b8c..adddfc926c9b3 100644
--- a/packages/nx/src/command-line/migrate.ts
+++ b/packages/nx/src/command-line/migrate.ts
@@ -1040,6 +1040,12 @@ async function runNxMigration(root: string, packageName: string, name: string) {
 
   const collection = readJsonFile<MigrationsJson>(collectionPath);
   const g = collection.generators || collection.schematics;
+  if (!g[name]) {
+    const source = collection.generators ? 'generators' : 'schematics';
+    throw new Error(
+      `Unable to determine implementation path for "${collectionPath}:${name}" using collection.${source}`
+    );
+  }
   const implRelativePath = g[name].implementation || g[name].factory;
 
   let implPath: string;