feat: add paste without formatting command

src/utils/plainTextPaste.test.ts

@@ -0,0 +1,95 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import {
+  activatePlainTextPasteTarget,
+  insertPlainTextFromClipboardText,
+  registerPlainTextPasteTarget,
+} from './plainTextPaste'
+
+const { trackEvent } = vi.hoisted(() => ({
+  trackEvent: vi.fn(),
+}))
+
+vi.mock('../lib/telemetry', () => ({
+  trackEvent,
+}))
+
+describe('plainTextPaste', () => {
+  afterEach(() => {
+    vi.clearAllMocks()
+    document.body.innerHTML = ''
+  })
+
+  it('replaces the selected text in a focused textarea', () => {
+    const input = document.createElement('textarea')
+    input.value = 'Alpha Beta'
+    document.body.appendChild(input)
+    input.focus()
+    input.setSelectionRange(6, 10)
+
+    expect(insertPlainTextFromClipboardText('Plain\nText')).toBe(true)
+
+    expect(input.value).toBe('Alpha Plain\nText')
+    expect(input.selectionStart).toBe(16)
+    expect(trackEvent).toHaveBeenCalledWith('plain_text_paste_used', {
+      surface: 'focused_input',
+    })
+  })
+
+  it('keeps command palette focus from swallowing the paste target', () => {
+    const palette = document.createElement('div')
+    palette.setAttribute('data-command-palette', 'true')
+    const input = document.createElement('input')
+    palette.appendChild(input)
+    document.body.appendChild(palette)
+
+    const target = {
+      contains: () => false,
+      insert: vi.fn(() => true),
+      isConnected: () => true,
+      surface: 'raw_editor',
+    }
+
+    const unregister = registerPlainTextPasteTarget(target)
+    activatePlainTextPasteTarget(target)
+    input.focus()
+
+    expect(insertPlainTextFromClipboardText('Plain')).toBe(true)
+    expect(target.insert).toHaveBeenCalledWith('Plain')
+    expect(input.value).toBe('')
+    expect(trackEvent).toHaveBeenCalledWith('plain_text_paste_used', {
+      surface: 'raw_editor',
+    })
+
+    unregister()
+  })
+
+  it('uses the latest registered editor target when focus is outside text controls', () => {
+    const target = {
+      contains: () => false,
+      insert: vi.fn(() => true),
+      isConnected: () => true,
+      surface: 'rich_editor',
+    }
+
+    const unregister = registerPlainTextPasteTarget(target)
+    document.body.focus()
+
+    expect(insertPlainTextFromClipboardText('Plain')).toBe(true)
+    expect(target.insert).toHaveBeenCalledWith('Plain')
+    expect(trackEvent).toHaveBeenCalledWith('plain_text_paste_used', {
+      surface: 'rich_editor',
+    })
+
+    unregister()
+  })
+
+  it('does not treat non-text inputs as editable paste surfaces', () => {
+    const input = document.createElement('input')
+    input.type = 'checkbox'
+    document.body.appendChild(input)
+    input.focus()
+
+    expect(insertPlainTextFromClipboardText('Plain')).toBe(false)
+    expect(trackEvent).not.toHaveBeenCalled()
+  })
+})