From 31b8d44fa199adfa251aa079c01b6d4336ae39fe Mon Sep 17 00:00:00 2001
From: Rhys Arkins <rhys@arkins.net>
Date: Wed, 3 Feb 2021 22:04:55 +0100
Subject: [PATCH] logs: improve npm constraint logging

---
 lib/manager/npm/post-update/npm.ts | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/manager/npm/post-update/npm.ts b/lib/manager/npm/post-update/npm.ts
index d63e6c5e09..ff442d980d 100644
--- a/lib/manager/npm/post-update/npm.ts
+++ b/lib/manager/npm/post-update/npm.ts
@@ -28,8 +28,19 @@ export async function generateLockFile(
   try {
     let installNpm = 'npm i -g npm';
     const npmCompatibility = config.constraints?.npm as string;
-    if (validRange(npmCompatibility)) {
-      installNpm = `npm i -g ${quote(`npm@${npmCompatibility}`)}`;
+    // istanbul ignore else
+    if (npmCompatibility) {
+      // istanbul ignore else
+      if (validRange(npmCompatibility)) {
+        installNpm = `npm i -g ${quote(`npm@${npmCompatibility}`)}`;
+      } else {
+        logger.debug(
+          { npmCompatibility },
+          'npm compatibility range is not valid - skipping'
+        );
+      }
+    } else {
+      logger.debug('No npm compatibility range found - installing npm latest');
     }
     const preCommands = [installNpm, 'hash -d npm'];
     const commands = [];
-- 
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