perf(overmind): improve SSR by not evaluating actions

Author: christianalfoni

packages/node_modules/overmind/src/index.ts

@@ -224,7 +224,11 @@ export class Overmind<ThisConfig extends IConfiguration>
       Create the proxy state tree instance with the state and a wrapper to expose
       the eventHub
     */
-    const proxyStateTree = this.createProxyStateTree(configuration, eventHub)
+    const proxyStateTree = this.createProxyStateTree(
+      configuration,
+      eventHub,
+      mode.mode === MODE_SSR ? false : IS_DEVELOPMENT
+    )
 
     this.originalConfiguration = configuration
     this.state = proxyStateTree.state
@@ -234,6 +238,10 @@ export class Overmind<ThisConfig extends IConfiguration>
     this.options = options
     this.mode = mode
 
+    if (mode.mode === MODE_SSR) {
+      return
+    }
+
     if (
       IS_DEVELOPMENT &&
       mode.mode === MODE_DEFAULT &&
@@ -282,7 +290,7 @@ export class Overmind<ThisConfig extends IConfiguration>
       }
     }
 
-    if (IS_PRODUCTION) {
+    if (IS_PRODUCTION && mode.mode === MODE_DEFAULT) {
       eventHub.on(EventType.OPERATOR_ASYNC, () => {
         proxyStateTree.getMutationTree().flush()
       })
@@ -345,14 +353,15 @@ export class Overmind<ThisConfig extends IConfiguration>
   }
   private createProxyStateTree(
     configuration: IConfiguration,
-    eventHub: EventEmitter<any> | MockedEventEmitter
+    eventHub: EventEmitter<any> | MockedEventEmitter,
+    devmode: boolean
   ) {
     const proxyStateTree = new ProxyStateTree(
       this.getState(configuration) as any,
       {
-        devmode: IS_DEVELOPMENT,
+        devmode,
         dynamicWrapper: (_, path, func) => func(eventHub, proxyStateTree, path),
-        onGetter: IS_DEVELOPMENT
+        onGetter: devmode
           ? (path, value) => {
               // We need to let any initial values be set first
               setTimeout(() => {