fix(files): keep the shared markdown parser editor unmounted

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/block-image-paragraph.test.ts

@@ -1,6 +1,6 @@
 /** @vitest-environment jsdom */
 import { getSchema, type JSONContent } from '@tiptap/core'
-import { afterEach, describe, expect, it } from 'vitest'
+import { describe, expect, it } from 'vitest'
 import { splitBlockImageParagraph } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/block-image-paragraph'
 import { createMarkdownContentExtensions } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/extensions'
 import {
@@ -9,8 +9,6 @@ import {
 } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-parse'
 
 const schema = getSchema(createMarkdownContentExtensions())
-const cleanups: Array<() => void> = []
-afterEach(() => cleanups.splice(0).forEach((cleanup) => cleanup()))
 
 describe('block images within Markdown paragraphs', () => {
   it('retains a whitespace-only code span beside an image', () => {

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-parse.test.ts

@@ -2,7 +2,7 @@
  * @vitest-environment jsdom
  */
 import { Editor } from '@tiptap/core'
-import { afterAll, describe, expect, it } from 'vitest'
+import { afterAll, describe, expect, it, vi } from 'vitest'
 import { createMarkdownContentExtensions } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/extensions'
 import {
   parseMarkdownToDoc,
@@ -255,3 +255,24 @@ describe('chunked parse — property test over randomized documents', () => {
     // the file, and adding it is what pushed both past 30s under whole-suite parallelism.
   }, 60000)
 })
+
+describe('serializeMarkdownBody', () => {
+  /**
+   * Serializing is synchronous, so any timer it leaves behind outlives the call — and a DOM-touching
+   * one fires after a jsdom environment is torn down, failing whichever suite finished first. A fresh
+   * module instance makes the shared editor get built under the fake clock, whatever ran before.
+   */
+  it('leaves no deferred work behind, including when it builds the shared editor', async () => {
+    vi.resetModules()
+    vi.useFakeTimers()
+    try {
+      const fresh = await import(
+        '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-parse'
+      )
+      fresh.serializeMarkdownBody('# Before ![Logo](/logo.png "Title") after\n\n- a\n- b')
+      expect(vi.getTimerCount()).toBe(0)
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+})

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-parse.ts

@@ -15,11 +15,19 @@ import {
  * `setContent`. Both are safe because all access is synchronous and single-threaded — each call fully
  * completes before the next — so no call ever observes another's partial state. One bounded instance
  * for the session, not a per-call allocation.
+ *
+ * It is never mounted: a mounted view renders every document into the DOM and its mutation observer
+ * schedules flush timers nothing can cancel, which fire after a jsdom test environment is torn down.
+ * TipTap installs extension plugins only when it mounts, so they are installed here the same way, keeping
+ * normalization such as the trailing paragraph identical to the live editor.
  */
 let parser: Editor | null = null
 
 function parserEditor(): Editor {
-  if (!parser) parser = new Editor({ extensions: createMarkdownContentExtensions() })
+  if (!parser) {
+    parser = new Editor({ element: null, extensions: createMarkdownContentExtensions() })
+    parser.view.updateState(parser.state.reconfigure({ plugins: parser.extensionManager.plugins }))
+  }
   return parser
 }
 
@@ -344,10 +352,11 @@ export function serializeMarkdownBody(body: string): string {
  * editor applies — output identical to `editor.getMarkdown()`. The server-side collab-doc converter
  * uses this to project a Yjs doc back to markdown through the exact client engine (parity by
  * construction), so it must stay the single serialize path (do not inline `getMarkdown` elsewhere).
+ * Nothing listens to the scratchpad, so it emits no update, which would only defer core bookkeeping.
  */
 export function serializeDocToMarkdown(doc: JSONContent): string {
   const editor = parserEditor()
-  editor.commands.setContent(doc, { contentType: 'json' })
+  editor.commands.setContent(doc, { contentType: 'json', emitUpdate: false })
   return editor.getMarkdown()
 }
 

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-paste.test.ts

@@ -9,19 +9,21 @@ import { afterEach, describe, expect, it } from 'vitest'
 import { createMarkdownContentExtensions } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/extensions'
 import { MarkdownPaste } from '@/app/workspace/[workspaceId]/files/components/file-viewer/rich-markdown-editor/markdown-paste'
 
-let editor: Editor | null = null
+const editors: Editor[] = []
 
 afterEach(() => {
-  editor?.destroy()
-  editor = null
+  for (const editor of editors.splice(0)) editor.destroy()
 })
 
+/** Every editor is destroyed after its test, including a second one a single test mounts. */
 function mount(editable = true): Editor {
-  return new Editor({
+  const editor = new Editor({
     extensions: [...createMarkdownContentExtensions(), MarkdownPaste],
     enablePasteRules: false,
     editable,
   })
+  editors.push(editor)
+  return editor
 }
 
 function dispatchPaste(
@@ -71,29 +73,29 @@ function transformHtml(ed: Editor, html: string): string {
 
 describe('markdown paste', () => {
   it('keeps pasted markdown literal inside a code block', () => {
-    editor = mount()
+    const editor = mount()
     editor.commands.setContent('```js\ncode here\n```', { contentType: 'markdown' })
     editor.commands.setTextSelection(5)
     expect(editor.isActive('codeBlock')).toBe(true)
     expect(paste(editor, '[link](https://example.com)')).toBe(false)
   })
 
   it('keeps pasted markdown literal inside inline code', () => {
-    editor = mount()
+    const editor = mount()
     editor.commands.setContent('a `codehere` b', { contentType: 'markdown' })
     editor.commands.setTextSelection(6)
     expect(editor.isActive('code')).toBe(true)
     expect(paste(editor, '*italic*')).toBe(false)
   })
 
   it('rejects the paste entirely in a read-only editor', () => {
-    editor = mount(false)
+    const editor = mount(false)
     expect(paste(editor, '# heading\n\n- one\n- two')).toBe(false)
     expect(editor.getText()).toBe('')
   })
 
   it('does not flatten a rich table containing literal Markdown-shaped cell text', () => {
-    editor = mount()
+    const editor = mount()
     dispatchPaste(
       editor,
       'Label\tValue\n**literal**\t42',
@@ -105,7 +107,7 @@ describe('markdown paste', () => {
   })
 
   it('preserves the structural blocks of a multi-block document, in order, on paste', () => {
-    editor = mount()
+    const editor = mount()
     expect(paste(editor, '# Title\n\nA paragraph.\n\n- a\n- b\n\n> quote')).toBe(true)
     const structural = (editor.getJSON().content ?? [])
       .map((node) => node.type)
@@ -114,7 +116,7 @@ describe('markdown paste', () => {
   })
 
   it('strips <style>/<script> from pasted HTML so their text never leaks into the doc', () => {
-    editor = mount()
+    const editor = mount()
     const gsheets =
       '<google-sheets-html-origin><style>td{mso-1:2}</style><table><tr><td>a</td></tr></table></google-sheets-html-origin>'
     const cleaned = transformHtml(editor, gsheets)
@@ -125,14 +127,14 @@ describe('markdown paste', () => {
   })
 
   it('strips nested/repeated <script> tags in a single pass, even deeply nested', () => {
-    editor = mount()
+    const editor = mount()
     expect(transformHtml(editor, 'a<script>x<script>y</script></script>b')).toBe('ab')
     const deeplyNested = `a${'<script>'.repeat(50)}x${'</script>'.repeat(50)}b`
     expect(transformHtml(editor, deeplyNested)).toBe('ab')
   })
 
   it('drops an unterminated <script>/<style> and everything after it, without duplicating the prefix', () => {
-    editor = mount()
+    const editor = mount()
     expect(transformHtml(editor, 'abc<script>never-closes')).toBe('abc')
     expect(transformHtml(editor, 'abc<style>never-closes')).toBe('abc')
     expect(transformHtml(editor, '<script>x<script>y</script>')).toBe('')
@@ -145,7 +147,7 @@ describe('linkify a selection on URL paste', () => {
     from = 1,
     to = 10
   ): { handled: boolean; href?: string; text: string } {
-    editor = mount()
+    const editor = mount()
     editor.commands.setContent('select me here', { contentType: 'markdown' })
     editor.commands.setTextSelection({ from, to })
     const handled = paste(editor, pasted)