diff --git a/shared/prompt-sequences.mjs b/shared/prompt-sequences.mjs
deleted file mode 100644
index 2610397..0000000
--- a/shared/prompt-sequences.mjs
+++ /dev/null
@@ -1,68 +0,0 @@
-/** Pure prompt-sequence helpers (shared by page + tests). */
-
-export function newId() {
-  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
-    return crypto.randomUUID()
-  }
-  return `ps-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 10)}`
-}
-
-export function emptyCharacter() {
-  return { id: newId(), name: '', description: '' }
-}
-
-export function emptyScene(index = 1) {
-  return {
-    id: newId(),
-    title: `Scene ${Math.max(1, index)}`,
-    style: '',
-    settings: '',
-    characters: [emptyCharacter()],
-    prompt: ''
-  }
-}
-
-export function cloneSceneForNext(previous, nextIndex) {
-  return {
-    id: newId(),
-    title: `Scene ${nextIndex}`,
-    style: previous.style,
-    settings: previous.settings,
-    characters: (previous.characters || []).map(character => ({
-      id: newId(),
-      name: character.name,
-      description: character.description
-    })),
-    prompt: previous.prompt
-  }
-}
-
-export function formatCharacterLine(character) {
-  const name = String(character?.name || '').trim()
-  const description = String(character?.description || '').trim()
-  if (!name && !description) return ''
-  if (name && description) return `${name}: ${description}`
-  return name || description
-}
-
-export function assembleSceneText(scene) {
-  const characterBlock = (scene?.characters || [])
-    .map(formatCharacterLine)
-    .filter(Boolean)
-    .join('\n')
-  const parts = [
-    String(scene?.style || '').trim(),
-    String(scene?.settings || '').trim(),
-    characterBlock,
-    String(scene?.prompt || '').trim()
-  ].filter(Boolean)
-  return parts.join('\n\n')
-}
-
-/** Scenes join with \\n\\n\\n (desktop Batch double blank). Name is never included. */
-export function assembleSequenceText(sequence) {
-  return (sequence?.scenes || [])
-    .map(assembleSceneText)
-    .filter(Boolean)
-    .join('\n\n\n')
-}
diff --git a/tests/prompt-sequences.test.mjs b/tests/prompt-sequences.test.mjs
index 86d7567..ee318c5 100644
--- a/tests/prompt-sequences.test.mjs
+++ b/tests/prompt-sequences.test.mjs
@@ -1,12 +1,28 @@
 import test from 'node:test'
 import assert from 'node:assert/strict'
-import {
+import { readFileSync, writeFileSync, unlinkSync } from 'node:fs'
+import { join } from 'node:path'
+import { tmpdir } from 'node:os'
+import { pathToFileURL } from 'node:url'
+import ts from 'typescript'
+
+const src = readFileSync(new URL('../utils/promptSequences.ts', import.meta.url), 'utf8')
+const js = ts.transpileModule(src, {
+  compilerOptions: {
+    target: ts.ScriptTarget.ES2022,
+    module: ts.ModuleKind.ESNext
+  }
+}).outputText
+const tmp = join(tmpdir(), `prompt-sequences-${process.pid}.mjs`)
+writeFileSync(tmp, js)
+const {
   assembleSceneText,
   assembleSequenceText,
   formatCharacterLine,
   emptyScene,
   cloneSceneForNext
-} from '../shared/prompt-sequences.mjs'
+} = await import(pathToFileURL(tmp).href)
+unlinkSync(tmp)
 
 test('formatCharacterLine covers name/description cases', () => {
   assert.equal(formatCharacterLine({ name: 'Ada', description: 'tall' }), 'Ada: tall')
diff --git a/utils/promptSequences.ts b/utils/promptSequences.ts
index a44e297..502aa6c 100644
--- a/utils/promptSequences.ts
+++ b/utils/promptSequences.ts
@@ -25,21 +25,89 @@ export const PROMPT_SEQUENCE_NAME_MAX = 80
 export const PROMPT_SEQUENCE_FIELD_MAX = 50_000
 export const PROMPT_SEQUENCE_TITLE_MAX = 60
 
-export {
-  newId,
-  emptyCharacter,
-  emptyScene,
-  cloneSceneForNext,
-  formatCharacterLine,
-  assembleSceneText,
-  assembleSequenceText
-} from '../shared/prompt-sequences.mjs'
+export function newId() {
+  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+    return crypto.randomUUID()
+  }
+  return `ps-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 10)}`
+}
 
-import {
-  newId,
-  emptyCharacter,
-  emptyScene
-} from '../shared/prompt-sequences.mjs'
+export function emptyCharacter(): PromptSequenceCharacter {
+  return { id: newId(), name: '', description: '' }
+}
+
+export function emptyScene(index = 1): PromptSequenceScene {
+  return {
+    id: newId(),
+    title: `Scene ${Math.max(1, index)}`,
+    style: '',
+    settings: '',
+    characters: [emptyCharacter()],
+    prompt: ''
+  }
+}
+
+export function cloneSceneForNext(previous: PromptSequenceScene, nextIndex: number): PromptSequenceScene {
+  return {
+    id: newId(),
+    title: `Scene ${nextIndex}`,
+    style: previous.style,
+    settings: previous.settings,
+    characters: (previous.characters || []).map(character => ({
+      id: newId(),
+      name: character.name,
+      description: character.description
+    })),
+    prompt: previous.prompt
+  }
+}
+
+/** Character line: "Name: description", or name-only, or description-only. */
+export function formatCharacterLine(character: { name?: string; description?: string }) {
+  const name = String(character?.name || '').trim()
+  const description = String(character?.description || '').trim()
+  if (!name && !description) return ''
+  if (name && description) return `${name}: ${description}`
+  return name || description
+}
+
+export function assembleSceneText(scene: {
+  style?: string
+  settings?: string
+  characters?: Array<{ name?: string; description?: string }>
+  prompt?: string
+}) {
+  const characterBlock = (scene.characters || [])
+    .map(formatCharacterLine)
+    .filter(Boolean)
+    .join('\n')
+  const parts = [
+    String(scene.style || '').trim(),
+    String(scene.settings || '').trim(),
+    characterBlock,
+    String(scene.prompt || '').trim()
+  ].filter(Boolean)
+  return parts.join('\n\n')
+}
+
+/**
+ * Whole sequence as one copyable block.
+ * Scenes join with a double blank line (\n\n\n) — same separator desktop Batch uses.
+ * Sequence name is never included.
+ */
+export function assembleSequenceText(sequence: {
+  scenes?: Array<{
+    style?: string
+    settings?: string
+    characters?: Array<{ name?: string; description?: string }>
+    prompt?: string
+  }>
+}) {
+  return (sequence.scenes || [])
+    .map(assembleSceneText)
+    .filter(Boolean)
+    .join('\n\n\n')
+}
 
 export function normalizePromptSequenceName(raw: unknown) {
   return String(raw || '').trim().replace(/\s+/g, ' ').slice(0, PROMPT_SEQUENCE_NAME_MAX)