Disable namespace loading info in console from shadow-cljs

frontend/dev/preload.cljs

@@ -0,0 +1,7 @@
+(ns preload
+  (:require
+   [devtools.core :as devtools]))
+
+;; Silence shadow-cljs devtools (ns reloading)
+(devtools/set-pref! :dont-display-banner true)
+(devtools/set-pref! :min-expandable-sequable-count-for-well-known-types 0)

frontend/shadow-cljs.edn

@@ -8,7 +8,9 @@
   {:target :browser
    :output-dir "resources/public/js/"
    :asset-path "/js"
-   :devtools {:browser-inject :main
+   :devtools {:preloads [preload devtools.preload]
+              :log false
+              :browser-inject :main
               :watch-dir "resources/public"
               :reload-strategy :full}
    :build-options {:manifest-name "manifest.json"}
@@ -65,7 +67,8 @@
    :compiler-options
    {:output-feature-set :es2020
     :output-wrapper false
-    :warnings {:fn-deprecated false}}
+    :warnings {:fn-deprecated false}
+    :closure-defines {shadow.debug.LogLevel :warning}}
 
    :release
    {:closure-defines {goog.DEBUG false