fix(inertia-sails): inject inertiaContext middleware when order is not configured

When sails.config.http.middleware.order is not explicitly defined (the
default for all Sails apps), the hook skipped injecting the
inertiaContext middleware entirely. This caused sails.inertia.share()
calls in routes.before handlers to run outside AsyncLocalStorage
context, silently dropping shared props.

Initialize the middleware order with Sails' defaults when undefined,
then inject inertiaContext before the router as intended.

Closes #193

Author: DominusKelvin

packages/inertia-sails/index.js

@@ -128,7 +128,22 @@ module.exports = function defineInertiaHook(sails) {
       // the request is already wrapped in AsyncLocalStorage context.
       if (sails.config.http && sails.config.http.middleware) {
         const mw = sails.config.http.middleware
-        if (mw.order && mw.order.indexOf('inertiaContext') === -1) {
+        // When order is not explicitly configured, Sails uses a default order
+        // internally. We need to set it here so we can inject inertiaContext
+        // before the router middleware.
+        if (!mw.order) {
+          mw.order = [
+            'cookieParser',
+            'session',
+            'bodyParser',
+            'compress',
+            'poweredBy',
+            'router',
+            'www',
+            'favicon'
+          ]
+        }
+        if (mw.order.indexOf('inertiaContext') === -1) {
           const routerIdx = mw.order.indexOf('router')
           if (routerIdx !== -1) {
             mw.order.splice(routerIdx, 0, 'inertiaContext')