feat(auth): @mosaic/auth — BetterAuth email/password setup (#68)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

.env.example

@@ -12,5 +12,9 @@ VALKEY_URL=redis://localhost:6380
 OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
 OTEL_SERVICE_NAME=mosaic-gateway
 
+# Auth (BetterAuth)
+BETTER_AUTH_SECRET=change-me-to-a-random-32-char-string
+BETTER_AUTH_URL=http://localhost:4000
+
 # Gateway
 GATEWAY_PORT=4000

docs/TASKS.md

@@ -6,7 +6,7 @@
 | ------ | ----------- | --------- | ------------------------------------------------------------- | --- | ----- |
 | P0-001 | done        | Phase 0   | Scaffold monorepo                                             | #60 | #1    |
 | P0-002 | done        | Phase 0   | @mosaic/types — migrate and extend shared types               | #65 | #2    |
-| P0-003 | not-started | Phase 0   | @mosaic/db — Drizzle schema and PG connection                 | —   | #3    |
+| P0-003 | done        | Phase 0   | @mosaic/db — Drizzle schema and PG connection                 | #67 | #3    |
 | P0-004 | not-started | Phase 0   | @mosaic/auth — BetterAuth email/password setup                | —   | #4    |
 | P0-005 | done        | Phase 0   | Docker Compose — PG 17, Valkey 8, SigNoz                      | #65 | #5    |
 | P0-006 | done        | Phase 0   | OTEL foundation — OpenTelemetry SDK setup                     | #65 | #6    |

packages/auth/package.json

@@ -1,6 +1,7 @@
 {
   "name": "@mosaic/auth",
   "version": "0.0.0",
+  "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "exports": {
@@ -16,7 +17,13 @@
     "test": "vitest run"
   },
   "devDependencies": {
+    "@types/node": "^22.0.0",
+    "tsx": "^4.0.0",
     "typescript": "^5.8.0",
     "vitest": "^2.0.0"
+  },
+  "dependencies": {
+    "@mosaic/db": "workspace:^",
+    "better-auth": "^1.5.5"
   }
 }

packages/auth/src/auth.ts

@@ -0,0 +1,42 @@
+import { betterAuth } from 'better-auth';
+import { drizzleAdapter } from 'better-auth/adapters/drizzle';
+import type { Db } from '@mosaic/db';
+
+export interface AuthConfig {
+  db: Db;
+  baseURL?: string;
+  secret?: string;
+}
+
+export function createAuth(config: AuthConfig) {
+  const { db, baseURL, secret } = config;
+
+  return betterAuth({
+    database: drizzleAdapter(db, {
+      provider: 'pg',
+      usePlural: true,
+    }),
+    baseURL: baseURL ?? process.env['BETTER_AUTH_URL'] ?? 'http://localhost:4000',
+    secret: secret ?? process.env['BETTER_AUTH_SECRET'],
+    basePath: '/api/auth',
+    emailAndPassword: {
+      enabled: true,
+    },
+    user: {
+      additionalFields: {
+        role: {
+          type: 'string',
+          required: false,
+          defaultValue: 'member',
+          input: false,
+        },
+      },
+    },
+    session: {
+      expiresIn: 60 * 60 * 24 * 7, // 7 days
+      updateAge: 60 * 60 * 24, // refresh daily
+    },
+  });
+}
+
+export type Auth = ReturnType<typeof createAuth>;

packages/auth/src/index.ts

@@ -1 +1 @@
-export const VERSION = '0.0.0';
+export { createAuth, type Auth, type AuthConfig } from './auth.js';

pnpm-lock.yaml

@@ -156,7 +156,20 @@ importers:
         version: 2.1.9(@types/node@22.19.15)
 
   packages/auth:
+    dependencies:
+      '@mosaic/db':
+        specifier: workspace:^
+        version: link:../db
+      better-auth:
+        specifier: ^1.5.5
+        version: 1.5.5(drizzle-kit@0.31.9)(drizzle-orm@0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8))(mongodb@7.1.0(socks@2.8.7))(next@16.1.6(@opentelemetry/api@1.9.0)(react-dom@19.2.4(react@19.2.4))(react@19.2.4))(react-dom@19.2.4(react@19.2.4))(react@19.2.4)(vitest@2.1.9(@types/node@22.19.15))
     devDependencies:
+      '@types/node':
+        specifier: ^22.0.0
+        version: 22.19.15
+      tsx:
+        specifier: ^4.0.0
+        version: 4.21.0
       typescript:
         specifier: ^5.8.0
         version: 5.9.3
@@ -228,7 +241,7 @@ importers:
     dependencies:
       drizzle-orm:
         specifier: ^0.45.1
-        version: 0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(postgres@3.4.8)
+        version: 0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8)
       postgres:
         specifier: ^3.4.8
         version: 3.4.8
@@ -623,6 +636,101 @@ packages:
       }
     engines: { node: '>=6.9.0' }
 
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+    resolution:
+      {
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+      }
+    peerDependencies:
+      '@better-auth/utils': 0.3.1
+      '@better-fetch/fetch': 1.1.21
+      '@cloudflare/workers-types': '>=4'
+      better-call: 1.3.2
+      jose: ^6.1.0
+      kysely: ^0.28.5
+      nanostores: ^1.0.1
+    peerDependenciesMeta:
+      '@cloudflare/workers-types':
+        optional: true
+
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+    resolution:
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+      }
+    peerDependencies:
+      '@better-auth/core': 1.5.5
+      '@better-auth/utils': ^0.3.0
+      drizzle-orm: '>=0.41.0'
+    peerDependenciesMeta:
+      drizzle-orm:
+        optional: true
+
+  '@better-auth/kysely-adapter@1.5.5':
+    resolution:
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+      }
+    peerDependencies:
+      '@better-auth/core': 1.5.5
+      '@better-auth/utils': ^0.3.0
+      kysely: ^0.27.0 || ^0.28.0
+
+  '@better-auth/memory-adapter@1.5.5':
+    resolution:
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+      }
+    peerDependencies:
+      '@better-auth/core': 1.5.5
+      '@better-auth/utils': ^0.3.0
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+      }
+    peerDependencies:
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+      '@better-auth/utils': ^0.3.0
+      mongodb: ^6.0.0 || ^7.0.0
+
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+      prisma: ^5.0.0 || ^6.0.0 || ^7.0.0
+    peerDependenciesMeta:
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+      prisma:
+        optional: true
+
+  '@better-auth/telemetry@1.5.5':
+    resolution:
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+      }
+    peerDependencies:
+      '@better-auth/core': 1.5.5
+
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+    resolution:
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@@ -4129,6 +4275,82 @@ packages:
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     engines: { node: '>=10.0.0' }
 
+  better-auth@1.5.5:
+    resolution:
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+      '@tanstack/react-start': ^1.0.0
+      '@tanstack/solid-start': ^1.0.0
+      better-sqlite3: ^12.0.0
+      drizzle-kit: '>=0.31.4'
+      drizzle-orm: '>=0.41.0'
+      mongodb: ^6.0.0 || ^7.0.0
+      mysql2: ^3.0.0
+      next: ^14.0.0 || ^15.0.0 || ^16.0.0
+      pg: ^8.0.0
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+    resolution:
+      {
+        integrity: sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==,
+      }
+    engines: { node: '>=18' }
+
   ts-algebra@2.0.0:
     resolution:
       {
@@ -6965,6 +7288,20 @@ packages:
       }
     engines: { node: '>= 8' }
 
+  webidl-conversions@7.0.0:
+    resolution:
+      {
+        integrity: sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==,
+      }
+    engines: { node: '>=12' }
+
+  whatwg-url@14.2.0:
+    resolution:
+      {
+        integrity: sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==,
+      }
+    engines: { node: '>=18' }
+
   which@2.0.2:
     resolution:
       {
@@ -7539,6 +7876,56 @@ snapshots:
 
   '@babel/runtime@7.28.6': {}
 
+  '@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)':
+    dependencies:
+      '@better-auth/utils': 0.3.1
+      '@better-fetch/fetch': 1.1.21
+      '@standard-schema/spec': 1.1.0
+      better-call: 1.3.2(zod@4.3.6)
+      jose: 6.2.1
+      kysely: 0.28.11
+      nanostores: 1.1.1
+      zod: 4.3.6
+
+  '@better-auth/drizzle-adapter@1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)(drizzle-orm@0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8))':
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/utils': 0.3.1
+    optionalDependencies:
+      drizzle-orm: 0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8)
+
+  '@better-auth/kysely-adapter@1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)(kysely@0.28.11)':
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/utils': 0.3.1
+      kysely: 0.28.11
+
+  '@better-auth/memory-adapter@1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)':
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/utils': 0.3.1
+
+  '@better-auth/mongo-adapter@1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)(mongodb@7.1.0(socks@2.8.7))':
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/utils': 0.3.1
+      mongodb: 7.1.0(socks@2.8.7)
+
+  '@better-auth/prisma-adapter@1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)':
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/utils': 0.3.1
+
+  '@better-auth/telemetry@1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))':
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/utils': 0.3.1
+      '@better-fetch/fetch': 1.1.21
+
+  '@better-auth/utils@0.3.1': {}
+
+  '@better-fetch/fetch@1.1.21': {}
+
   '@borewit/text-codec@0.2.2': {}
 
   '@discordjs/builders@1.13.1':
@@ -8259,6 +8646,10 @@ snapshots:
       - bufferutil
       - utf-8-validate
 
+  '@mongodb-js/saslprep@1.4.6':
+    dependencies:
+      sparse-bitfield: 3.0.3
+
   '@nestjs/common@11.1.16(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)':
     dependencies:
       file-type: 21.3.0
@@ -8353,6 +8744,10 @@ snapshots:
   '@next/swc-win32-x64-msvc@16.1.6':
     optional: true
 
+  '@noble/ciphers@2.1.1': {}
+
+  '@noble/hashes@2.0.1': {}
+
   '@nuxt/opencollective@0.4.1':
     dependencies:
       consola: 3.4.2
@@ -9464,6 +9859,8 @@ snapshots:
 
   '@socket.io/component-emitter@3.1.2': {}
 
+  '@standard-schema/spec@1.1.0': {}
+
   '@swc/helpers@0.5.15':
     dependencies:
       tslib: 2.8.1
@@ -9550,6 +9947,12 @@ snapshots:
 
   '@types/validator@13.15.10': {}
 
+  '@types/webidl-conversions@7.0.3': {}
+
+  '@types/whatwg-url@13.0.0':
+    dependencies:
+      '@types/webidl-conversions': 7.0.3
+
   '@types/ws@8.18.1':
     dependencies:
       '@types/node': 22.19.15
@@ -9774,6 +10177,45 @@ snapshots:
 
   basic-ftp@5.2.0: {}
 
+  better-auth@1.5.5(drizzle-kit@0.31.9)(drizzle-orm@0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8))(mongodb@7.1.0(socks@2.8.7))(next@16.1.6(@opentelemetry/api@1.9.0)(react-dom@19.2.4(react@19.2.4))(react@19.2.4))(react-dom@19.2.4(react@19.2.4))(react@19.2.4)(vitest@2.1.9(@types/node@22.19.15)):
+    dependencies:
+      '@better-auth/core': 1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1)
+      '@better-auth/drizzle-adapter': 1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)(drizzle-orm@0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8))
+      '@better-auth/kysely-adapter': 1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)(kysely@0.28.11)
+      '@better-auth/memory-adapter': 1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)
+      '@better-auth/mongo-adapter': 1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)(mongodb@7.1.0(socks@2.8.7))
+      '@better-auth/prisma-adapter': 1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))(@better-auth/utils@0.3.1)
+      '@better-auth/telemetry': 1.5.5(@better-auth/core@1.5.5(@better-auth/utils@0.3.1)(@better-fetch/fetch@1.1.21)(better-call@1.3.2(zod@4.3.6))(jose@6.2.1)(kysely@0.28.11)(nanostores@1.1.1))
+      '@better-auth/utils': 0.3.1
+      '@better-fetch/fetch': 1.1.21
+      '@noble/ciphers': 2.1.1
+      '@noble/hashes': 2.0.1
+      better-call: 1.3.2(zod@4.3.6)
+      defu: 6.1.4
+      jose: 6.2.1
+      kysely: 0.28.11
+      nanostores: 1.1.1
+      zod: 4.3.6
+    optionalDependencies:
+      drizzle-kit: 0.31.9
+      drizzle-orm: 0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8)
+      mongodb: 7.1.0(socks@2.8.7)
+      next: 16.1.6(@opentelemetry/api@1.9.0)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      react: 19.2.4
+      react-dom: 19.2.4(react@19.2.4)
+      vitest: 2.1.9(@types/node@22.19.15)
+    transitivePeerDependencies:
+      - '@cloudflare/workers-types'
+
+  better-call@1.3.2(zod@4.3.6):
+    dependencies:
+      '@better-auth/utils': 0.3.1
+      '@better-fetch/fetch': 1.1.21
+      rou3: 0.7.12
+      set-cookie-parser: 3.0.1
+    optionalDependencies:
+      zod: 4.3.6
+
   bignumber.js@9.3.1: {}
 
   bowser@2.14.1: {}
@@ -9795,6 +10237,8 @@ snapshots:
     dependencies:
       fill-range: 7.1.1
 
+  bson@7.2.0: {}
+
   buffer-crc32@0.2.13: {}
 
   buffer-equal-constant-time@1.0.1: {}
@@ -9923,6 +10367,8 @@ snapshots:
 
   deep-is@0.1.4: {}
 
+  defu@6.1.4: {}
+
   degenerator@5.0.1:
     dependencies:
       ast-types: 0.13.4
@@ -9966,10 +10412,11 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  drizzle-orm@0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(postgres@3.4.8):
+  drizzle-orm@0.45.1(@opentelemetry/api@1.9.0)(@types/pg@8.15.6)(kysely@0.28.11)(postgres@3.4.8):
     optionalDependencies:
       '@opentelemetry/api': 1.9.0
       '@types/pg': 8.15.6
+      kysely: 0.28.11
       postgres: 3.4.8
 
   eastasianwidth@0.2.0: {}
@@ -10598,6 +11045,8 @@ snapshots:
     optionalDependencies:
       '@pkgjs/parseargs': 0.11.0
 
+  jose@6.2.1: {}
+
   js-tokens@4.0.0: {}
 
   js-yaml@4.1.1:
@@ -10643,6 +11092,8 @@ snapshots:
   koffi@2.15.2:
     optional: true
 
+  kysely@0.28.11: {}
+
   levn@0.4.1:
     dependencies:
       prelude-ls: 1.2.1
@@ -10726,6 +11177,8 @@ snapshots:
 
   marked@15.0.12: {}
 
+  memory-pager@1.5.0: {}
+
   merge-stream@2.0.0: {}
 
   micromatch@4.0.8:
@@ -10767,6 +11220,19 @@ snapshots:
 
   module-details-from-path@1.0.4: {}
 
+  mongodb-connection-string-url@7.0.1:
+    dependencies:
+      '@types/whatwg-url': 13.0.0
+      whatwg-url: 14.2.0
+
+  mongodb@7.1.0(socks@2.8.7):
+    dependencies:
+      '@mongodb-js/saslprep': 1.4.6
+      bson: 7.2.0
+      mongodb-connection-string-url: 7.0.1
+    optionalDependencies:
+      socks: 2.8.7
+
   ms@2.1.3: {}
 
   mz@2.7.0:
@@ -10777,6 +11243,8 @@ snapshots:
 
   nanoid@3.3.11: {}
 
+  nanostores@1.1.1: {}
+
   natural-compare@1.4.0: {}
 
   negotiator@0.6.3: {}
@@ -11139,6 +11607,8 @@ snapshots:
       '@rollup/rollup-win32-x64-msvc': 4.59.0
       fsevents: 2.3.3
 
+  rou3@0.7.12: {}
+
   rxjs@7.8.2:
     dependencies:
       tslib: 2.8.1
@@ -11163,6 +11633,8 @@ snapshots:
 
   set-cookie-parser@2.7.2: {}
 
+  set-cookie-parser@3.0.1: {}
+
   sharp@0.34.5:
     dependencies:
       '@img/colour': 1.1.0
@@ -11286,6 +11758,10 @@ snapshots:
 
   source-map@0.6.1: {}
 
+  sparse-bitfield@3.0.3:
+    dependencies:
+      memory-pager: 1.5.0
+
   split2@4.2.0: {}
 
   stack-utils@2.0.6:
@@ -11384,6 +11860,10 @@ snapshots:
       '@tokenizer/token': 0.3.0
       ieee754: 1.2.1
 
+  tr46@5.1.1:
+    dependencies:
+      punycode: 2.3.1
+
   ts-algebra@2.0.0: {}
 
   ts-api-utils@2.4.0(typescript@5.9.3):
@@ -11533,6 +12013,13 @@ snapshots:
 
   web-streams-polyfill@3.3.3: {}
 
+  webidl-conversions@7.0.0: {}
+
+  whatwg-url@14.2.0:
+    dependencies:
+      tr46: 5.1.1
+      webidl-conversions: 7.0.0
+
   which@2.0.2:
     dependencies:
       isexe: 2.0.0