v1.0 with SW PWA enabled

frontend/node_modules/tiny-invariant/src/tiny-invariant.flow.js

@@ -0,0 +1,12 @@
+// @flow
+// This file is not actually executed
+// It is just used by flow for typing
+
+const prefix: string = 'Invariant failed';
+
+export default function invariant(condition: mixed, message?: string | (() => string)) {
+  if (condition) {
+    return;
+  }
+  throw new Error(`${prefix}: ${message || ''}`);
+}