Add support for NO_COLOR env var

Author: Seldaek

CHANGELOG.md

@@ -10,6 +10,7 @@ CHANGELOG
  * added the stamps of a message after it is dispatched in `TraceableMessageBus` and `MessengerDataCollector` collected data
  * added `UuidCaster`
  * made all casters final
+ * added support for the `NO_COLOR` env var (https://no-color.org/)
 
 4.3.0
 -----

Dumper/CliDumper.php

@@ -582,6 +582,11 @@ private function hasColorSupport($stream): bool
             return false;
         }
 
+        // Follow https://no-color.org/
+        if (isset($_SERVER['NO_COLOR']) || false !== getenv('NO_COLOR')) {
+            return false;
+        }
+
         if ('Hyper' === getenv('TERM_PROGRAM')) {
             return true;
         }