Loader (cms-client.js), submodule-aware editor source path, build:watch

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

test/loader.test.ts

@@ -0,0 +1,49 @@
+import { describe, expect, it, vi } from 'vitest'
+import { bundleUrl, hasPreviewCookie, runLoader, type LoaderEnv } from '../src/loader-core'
+
+function env(href: string, cookie = '', scriptSrc?: string) {
+  const jar = { value: cookie }
+  const e = {
+    location: { href, protocol: new URL(href).protocol, replace: vi.fn() },
+    cookie: { get: () => jar.value, set: (v: string) => void (jar.value = v) },
+    scriptSrc,
+    load: vi.fn(() => Promise.resolve({})),
+  } satisfies LoaderEnv
+  return { e, jar }
+}
+
+describe('cms-client loader', () => {
+  it('does nothing for visitors', () => {
+    const { e } = env('https://k6n.net/')
+    expect(runLoader(e)).toBe('idle')
+    expect(e.load).not.toHaveBeenCalled()
+  })
+
+  it('loads the editor bundle next to the script when the preview cookie is set', () => {
+    const { e } = env('https://k6n.net/', 'a=b; cms_preview=1', 'https://k6n.net/editor/cms-client.js')
+    expect(runLoader(e)).toBe('loaded')
+    expect(e.load).toHaveBeenCalledWith('https://k6n.net/editor/onpage-editor.js')
+  })
+
+  it('?cms_preview=1 sets the cookie, strips the param and reloads', () => {
+    const { e, jar } = env('https://k6n.net/a?x=1&cms_preview=1')
+    expect(runLoader(e)).toBe('redirected')
+    expect(jar.value).toMatch(/^cms_preview=1; path=\/; SameSite=Lax; Secure$/)
+    expect(e.location.replace).toHaveBeenCalledWith('https://k6n.net/a?x=1')
+    expect(e.load).not.toHaveBeenCalled()
+  })
+
+  it('?cms_preview=0 clears the cookie (no Secure on http)', () => {
+    const { e, jar } = env('http://localhost/a?cms_preview=0', 'cms_preview=1')
+    runLoader(e)
+    expect(jar.value).toBe('cms_preview=; path=/; max-age=0; SameSite=Lax')
+    expect(e.location.replace).toHaveBeenCalledWith('http://localhost/a')
+  })
+
+  it('helpers', () => {
+    expect(hasPreviewCookie('cms_preview=1')).toBe(true)
+    expect(hasPreviewCookie('xcms_preview=1')).toBe(false)
+    expect(hasPreviewCookie('cms_preview=0')).toBe(false)
+    expect(bundleUrl()).toBe('/editor/onpage-editor.js')
+  })
+})