fix flickering

example/app.tsx

@@ -1,16 +1,19 @@
 import TWPreTail from "https://esm.sh/v115/@twind/preset-tailwind@1.1.4/es2022/preset-tailwind.mjs";
 import TWPreAuto from "https://esm.sh/v115/@twind/preset-autoprefix@1.0.7/es2022/preset-autoprefix.mjs";
 import React from "react";
-import Component from "./deep/component.tsx";
 import * as Iso from "@eno/iso";
 
+const Comp = React.lazy(()=>import("./deep/component.tsx"));
+
 export default ()=>
 {
     return <div class="p-4 font-sans">
         <Iso.Metas title="Main Page!"/>
         <h1 class="my-2 font(bold serif) text(2xl)">Title!!</h1>
-        <h2>subtitle</h2>
+        <h2>suspended:</h2>
-        <Component/>
+        <React.Suspense fallback={<div>Loading!</div>}>
+            <Comp/>
+        </React.Suspense>
         <Iso.Switch>
             <Iso.Case value="page">
                 <Iso.Switch>

example/deep/component.tsx

@@ -7,13 +7,15 @@ export default ()=>
     const [routeGet, routeSet] = Iso.Router.Consumer();
 
     type CatFact = {fact:string, length:number}|undefined;
-    const [Data, Updating] = Iso.Fetch.Use(`https://catfact.ninja/fact`);
+    const [Data, Updating] = Iso.Fetch.Use(`https://catfact.ninja/fact`, undefined, 60, true, true, true);
+
+
+    console.log("render!!")
 
     return <div class="p-4 text-red-500">
         <Iso.Metas title="Component!"/>
-        Route is: {routeGet.Path.toString()}
+        Component Route is: {routeGet.Path.toString()}
         <button className="p-4 bg-red-500 text-white" onClick={e=>{countSet(countGet+1); routeSet(["lol", "idk"], {count:countGet+1});}}>{countGet}</button>
-        Component!!!
         <a href="/page/about-us" className="p-2 text(lg blue-500) font-bold">a link</a>
         <p>Data:{Data && (Data as CatFact)?.fact}</p>
         <p>Status:{Updating?'loading':'done'}</p>

lib/iso.tsx

@@ -160,19 +160,22 @@ export const Switch =({children}:{children:Children})=>
 export const Case =({children, value}:{children:Children, value?:string, default?:true})=>null;
 export const useRouteVars =()=> React.useContext(SwitchContext).keys;
 
-export type FetchRecord = {URL:string, CacheFor:number, CachedAt:number, CacheOnServer:boolean, Promise?:Promise<FetchRecord>, DelaySSR:boolean, Error?:string, JSON?:object};
+export type FetchRecord = {URL:string, CacheFor:number, CachedAt:number, CacheOnServer:boolean, Promise?:Promise<FetchRecord>, DelaySSR:boolean, Seed:boolean, Error?:string, JSON?:object};
+type FetchGuide = [Record:FetchRecord, Init:boolean, Listen:boolean];
+export type FetchHookState = [Data:undefined|object, Updating:boolean];
 export const Fetch = {
     Cache:new Map() as Map<string, FetchRecord>,
     ServerBlocking:false as false|Promise<FetchRecord>[],
-    ServerTouched:new Set() as Set<FetchRecord>,
+    ServerTouched:false as false|Set<FetchRecord>,
+    ServerRemove:false as false|Set<FetchRecord>,
     Seed(seed:FetchRecord[])
     {
         seed.forEach(r=>{
-            r.Promise = Promise.resolve(r);
+            //r.Promise = Promise.resolve(r);
             Fetch.Cache.set(r.URL, r)
         });
     },
-    Request(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true)
+    Request(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true, Seed:boolean = true):FetchGuide
     {
         let check = Fetch.Cache.get(URL);
         
@@ -187,17 +190,24 @@ export const Fetch = {
                 return inCheck;
             });
             return inCheck;
-        }
+        };
 
         if(!check)
         {
+            // not in the cache
+            // - listen
+
             console.log(`making new cache record...`);
-            return load({URL, CacheFor, CachedAt:0, CacheOnServer, DelaySSR});
+            return [load({URL, CacheFor, CachedAt:0, CacheOnServer, DelaySSR, Seed}), false, true];
         }
         else if(check.CachedAt == 0)
         {
+            // loading started but not finished
+            // - listen
+            // - possibly init if there is something in JSON
+
             console.log(`currently being cached...`);
-            return check;
+            return [check, check.JSON ? true : false, true];
         }
         else
         {
@@ -205,38 +215,49 @@ export const Fetch = {
             let secondsAge = (new Date().getTime() - check.CachedAt)/1000;
             if(secondsAge > check.CacheFor)
             {
+                // cached but expired
+                // - listen
+                // - init
                 console.log(`...outdated...`);
-                return load(check);
+                return [load(check), true, true];
             }
             else
             {
+                // cached and ready
+                // - init
                 console.log(`...retrieved!`);
-                return check;
+                return [check, true, false];
             }
 
         }
     },
-    Use(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true)
+    Use(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true, Seed:boolean = true)
     {
-        type FetchHookState = [Data:undefined|object, Updating:boolean];
+        const [receipt, init, listen] = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR, Seed);
-        const [cacheGet, cacheSet] = React.useState([undefined, true] as FetchHookState);
+        const initialState:FetchHookState = init ? [receipt.JSON, listen] : [undefined, true];
-        if(Fetch.ServerBlocking && DelaySSR)
+        const [cacheGet, cacheSet] = React.useState(initialState);
+
+        if(Fetch.ServerBlocking && Fetch.ServerTouched && DelaySSR) // if server-side rendering
         {
-            const receipt = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR);
+            if(listen) // if the request is pending
-            if(receipt.CachedAt === 0 && receipt.Promise)
             {
-                Fetch.ServerBlocking.push(receipt.Promise);
+                receipt.Promise && Fetch.ServerBlocking.push(receipt.Promise); // add promise to blocking list
+                return [undefined, listen] as FetchHookState; // no need to return any actual data while waiting server-side
             }
-            else
+            else // if request is ready
             {
-                Fetch.ServerTouched.add(receipt);
+                receipt.Seed && Fetch.ServerTouched.add(receipt); // add record to client seed list (if specified in receipt.seed)
+                return [receipt.JSON, false] as FetchHookState;
             }
-            return [receipt.JSON, receipt.CachedAt === 0];
         }
+
         React.useEffect(()=>
         {
-            const receipt = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR);
+            if(listen)
-            receipt.Promise?.then(()=>cacheSet([receipt.JSON, receipt.CachedAt === 0]));
+            {
+                //const receipt = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR);
+                receipt.Promise?.then(()=>cacheSet([receipt.JSON, receipt.CachedAt === 0]));
+            }
         }
         , []);
 

server.tsx

@@ -2,6 +2,7 @@ import * as ESBuild from 'https://deno.land/x/esbuild@v0.14.45/mod.js';
 import * as MIME from "https://deno.land/std@0.180.0/media_types/mod.ts";
 import { debounce } from "https://deno.land/std@0.151.0/async/debounce.ts";
 import SSR from "https://esm.sh/v113/preact-render-to-string@6.0.2";
+import Prepass from "https://esm.sh/preact-ssr-prepass@1.2.0";
 import * as Twind from "https://esm.sh/@twind/core@1.1.3";
 import React from "react";
 import * as Iso from "@eno/iso";
@@ -35,7 +36,8 @@ const Transpileable =(inFilePath:string):boolean=>
 };
 const Transpile =async(inCode:string, inKey:string):Promise<string>=>
 {
-    const transpile = await ESBuild.transform(inCode, { loader: "tsx", minify:true});
+    const transpile = await ESBuild.transform(inCode, { loader: "tsx", sourcemap:"inline", minify:true, sourcefile:inKey});
+
     Transpiled.set(inKey, transpile.code);
     return transpile.code;
 };
@@ -222,22 +224,29 @@ FileListen("${url.pathname}", reloadHandler);`;
         else
         {
             Iso.Fetch.ServerBlocking = [];
-            let bake = SSR(<Iso.Router.Provider url={url}><App/></Iso.Router.Provider>);
+            Iso.Fetch.ServerTouched = new Set();
+            Iso.Fetch.ServerRemove = new Set();
+            let app = <Iso.Router.Provider url={url}><App/></Iso.Router.Provider>;
+            await Prepass(app)
+            let bake = SSR(app);
             while(Iso.Fetch.ServerBlocking.length)
             {
                 await Promise.all(Iso.Fetch.ServerBlocking);
                 Iso.Fetch.ServerBlocking = [];
-                bake = SSR(<Iso.Router.Provider url={url}><App/></Iso.Router.Provider>);
+                // at this point, anything that was requested that was not cached, has now been loaded and cached
+                // this next render will use cached resources. using a cached resource (if its "Seed" is true) adds it to the "touched" set.
+                app = <Iso.Router.Provider url={url}><App/></Iso.Router.Provider>;
+                await Prepass(app)
+                bake = SSR(app);
             }
 
             const seed:Iso.FetchRecord[] = [];
             Iso.Fetch.ServerTouched.forEach((record)=>{
-
                 const r:Iso.FetchRecord = {...record};
                 delete r.Promise;
                 seed.push(r);
             });
-            Iso.Fetch.ServerTouched = new Set();
+            Iso.Fetch.ServerTouched = false;
 
             const results = Twind.extract(bake, TwindInst);
 
@@ -255,13 +264,13 @@ FileListen("${url.pathname}", reloadHandler);`;
     <body>
         <div id="app">${results.html}</div>
         <script type="module">
-            import {render, createElement as H} from "react";
+            import {hydrate, createElement as H} from "react";
             import * as Twind from "https://esm.sh/v115/@twind/core@1.1.3/es2022/core.mjs";
             import {default as App, CSS} from "@eno/app";
             import {Router, Fetch} from "@eno/iso";
             Twind.install(CSS);
             Fetch.Seed(${JSON.stringify(seed)});
-            render( H(Router.Provider, null, H(App)), document.querySelector("#app"));
+            hydrate( H(Router.Provider, null, H(App)), document.querySelector("#app"));
         </script>
     </body>
 </html>`;