front/SvelteViewEngine: add isSsr local

src/assets/views/magic_link_lobby.svelte

@@ -14,7 +14,7 @@
 
     let countdown;
     let validUntilDate = new Date(validUntil);
-    $: countdown = $locals.isPreRender ? '...' : Time.humanizeTimeTo(validUntilDate);
+    $: countdown = $locals.isSsr ? '...' : Time.humanizeTimeTo(validUntilDate);
 
     onMount(() => {
         const interval = setInterval(() => {

src/frontend/SvelteViewEngine.ts

@@ -48,12 +48,14 @@ export default class SvelteViewEngine extends ViewEngine {
         const rootTemplateFile = await this.resolveFileFromCanonicalNameOrFail('templates/svelte_template.html');
         const rawOutput = await this.fileCache.get(rootTemplateFile, !config.get<boolean>('view.cache'));
 
+        locals.isSsr = true;
         const {
             head,
             html,
             css,
         } = await this.renderSvelteSsr(canonicalViewName, locals);
 
+        locals.isSsr = false;
         const serializedLocals = JSON.stringify(locals, (key, value) => {
             if (key.startsWith('_') || typeof value === 'function') return undefined;
             return value;

test/assets/views/AllTests.svelte

@@ -12,7 +12,7 @@
 	}
 </style>
 
-<div class="render-mode">{$locals.isPreRender ? 'SSR' : 'CSR'}</div>
+<div class="render-mode">{$locals.isSsr ? 'SSR' : 'CSR'}</div>
 
 <div class="data-table-container">
     <table class="data-table">