From f5b2ae616f1878cb782b8ac7033a137e2ba3aa5a Mon Sep 17 00:00:00 2001
From: Pete Bacon Darwin <pete@bacondarwin.com>
Date: Sun, 5 May 2019 15:40:30 +0100
Subject: [PATCH] feat(ivy): ngcc - add debug message for invalid entry-points
 (#30270)

PR Close #30270
---
 packages/compiler-cli/ngcc/src/main.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/compiler-cli/ngcc/src/main.ts b/packages/compiler-cli/ngcc/src/main.ts
index 9da09766e6..4a760b3e63 100644
--- a/packages/compiler-cli/ngcc/src/main.ts
+++ b/packages/compiler-cli/ngcc/src/main.ts
@@ -95,9 +95,16 @@ export function mainNgcc(
     return;
   }
 
-  const {entryPoints} = finder.findEntryPoints(
+  const {entryPoints, invalidEntryPoints} = finder.findEntryPoints(
       AbsoluteFsPath.from(basePath), absoluteTargetEntryPointPath, pathMappings);
 
+  invalidEntryPoints.forEach(invalidEntryPoint => {
+    logger.debug(
+        `Invalid entry-point ${invalidEntryPoint.entryPoint.path}.`,
+        `It is missing required dependencies:\n` +
+            invalidEntryPoint.missingDependencies.map(dep => ` - ${dep}`).join('\n'));
+  });
+
   if (absoluteTargetEntryPointPath && entryPoints.length === 0) {
     markNonAngularPackageAsProcessed(fs, absoluteTargetEntryPointPath, propertiesToConsider);
     return;