chore: Update coupon code

src/lib/components/migration/EditorChooserModal.svelte

@@ -1,8 +1,9 @@
 <script lang="ts">
   import { Button } from '$/components/ui/button';
   import * as Dialog from '$/components/ui/dialog';
-  import { dismissEditorChooser, isOnMermaidAI } from '$/util/migration/domainMigration';
+  import { dismissEditorChooser } from '$/util/migration/domainMigration';
   import { logEvent, logMermaidChartClick } from '$/util/stats';
+  import { getCheckoutUrl } from '$/util/util';
   import CodeIcon from '~icons/custom/code';
   import OpenSourceIcon from '~icons/material-symbols/book-2-outline-rounded';
   import ChatIcon from '~icons/material-symbols/chat-outline-rounded';
@@ -28,15 +29,8 @@
     logEvent('chooseEditor', { choice: 'plus' });
     logMermaidChartClick('editorPicker');
     close();
-    const utmSource = isOnMermaidAI() ? 'mermaid_ai_live' : 'mermaid_live_editor';
     window.open(
-      `https://mermaid.ai/app/user/billing/checkout?${new URLSearchParams({
-        coupon: 'dmIuNbqx',
-        tier: 'plus',
-        utm_campaign: 'start_plus',
-        utm_medium: '2_editor_selection',
-        utm_source: utmSource
-      }).toString()}`,
+      getCheckoutUrl({ utmCampaign: 'start_plus', utmMedium: '2_editor_selection' }),
       '_blank'
     );
   };
@@ -75,7 +69,7 @@
           <div class="mb-2 flex justify-center">
             <span
               class="rounded-full bg-pink-100 px-3 py-0.5 text-xs font-semibold text-pink-700 dark:bg-pink-950 dark:text-pink-300">
-              Limited time: 10% off
+              10% off with code JS26
             </span>
           </div>
 

src/lib/util/promos/JS2026.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import { Button } from '$/components/ui/button';
-  import { isOnMermaidAI } from '$/util/migration/domainMigration';
+  import { getCheckoutUrl } from '$/util/util';
   import type { Snippet } from 'svelte';
 
   interface Props {
@@ -9,15 +9,7 @@
 
   let { closeBanner }: Props = $props();
 
-  const utmSource = isOnMermaidAI() ? 'mermaid_ai_live' : 'mermaid_live_editor';
-
-  const url = `https://mermaid.ai/app/user/billing/checkout?${new URLSearchParams({
-    coupon: 'dmIuNbqx',
-    tier: 'plus',
-    utm_campaign: 'newyear',
-    utm_medium: 'banner_ad',
-    utm_source: utmSource
-  }).toString()}`;
+  const url = getCheckoutUrl({ utmCampaign: 'oss_coupon', utmMedium: 'banner_ad' });
 </script>
 
 <div class="flex w-full items-center bg-[#E0095F] p-1.5" role="banner">
@@ -27,11 +19,11 @@
       target="_blank"
       class="col-start-1 row-start-1 flex items-center justify-center gap-4 no-underline">
       <span class="text-base tracking-wider text-white">
-        Limited time: 10% off Mermaid Advanced Editor with code NEWYEAR
+        Try Mermaid Advanced Editor — OSS users get 10% off with code JS26
       </span>
       <Button
         class="shrink-0 rounded-md bg-[#1E1A2E] px-3 py-1.5 text-base font-semibold tracking-wide text-white hover:bg-[#261A56]">
-        Claim discount
+        Get started
       </Button>
     </a>
   </div>

src/lib/util/promos/promo.ts

@@ -5,7 +5,7 @@ import type { Component } from 'svelte';
 import { get, writable, type Writable } from 'svelte/store';
 import { localStorage, persist } from '../persist';
 import April2025 from './April2025.svelte';
-import NewYear2026 from './NewYear2026.svelte';
+import JS2026 from './JS2026.svelte';
 
 dayjs.extend(duration);
 
@@ -17,10 +17,10 @@ interface Promotion {
 }
 
 const promotions: Record<string, Promotion> = {
-  'promo-newyear-2026': {
+  'promo-js-2026': {
     startDate: new Date('2026-01-01'),
-    endDate: new Date('2026-03-14'),
-    component: NewYear2026,
+    endDate: new Date('2026-12-31'),
+    component: JS2026,
     hideDurationMs: dayjs.duration(1, 'week').asMilliseconds()
   },
   'promo-april-2025': {

src/lib/util/util.ts

@@ -40,6 +40,23 @@ export const MCBaseURL = env.isEnabledMermaidChartLinks
   ? 'https://mermaid.ai' // 'http://localhost:5174'
   : 'https://example.com';
 
+export const getCheckoutUrl = ({
+  utmCampaign,
+  utmMedium
+}: {
+  utmCampaign: string;
+  utmMedium: string;
+}): string => {
+  const params = new URLSearchParams({
+    coupon: 'arDfyFT8',
+    tier: 'plus',
+    utm_campaign: utmCampaign,
+    utm_medium: utmMedium,
+    utm_source: getUTMSource()
+  });
+  return `${MCBaseURL}/app/user/billing/checkout?${params.toString()}`;
+};
+
 let count = 0;
 export const errorDebug = (limit = 1000) => {
   count += 1;