feat(dev-server): add CSP support for vite's injectClientScript option

.changeset/rich-apes-beg.md

@@ -0,0 +1,5 @@
+---
+'@hono/vite-dev-server': minor
+---
+
+feat: add CSP support to vite's `injectClientScript` option

packages/dev-server/e2e-bun/e2e.test.ts

@@ -17,6 +17,22 @@ test('Should contain an injected script tag', async ({ page }) => {
   const lastScriptTag = await page.$('script:last-of-type')
   expect(lastScriptTag).not.toBeNull()
 
+  const nonce = await lastScriptTag?.getAttribute('nonce')
+  expect(nonce).toBeNull()
+
+  const content = await lastScriptTag?.textContent()
+  expect(content).toBe('import("/@vite/client")')
+})
+
+test('Should contain an injected script tag with a nonce', async ({ page }) => {
+  await page.goto('/with-nonce')
+
+  const lastScriptTag = await page.$('script:last-of-type')
+  expect(lastScriptTag).not.toBeNull()
+
+  const nonce = await lastScriptTag?.getAttribute('nonce')
+  expect(nonce).not.toBeNull()
+
   const content = await lastScriptTag?.textContent()
   expect(content).toBe('import("/@vite/client")')
 })

packages/dev-server/e2e-bun/mock/app.ts

@@ -8,6 +8,11 @@ app.get('/', (c) => {
   return c.html('<h1>Hello Vite!</h1>')
 })
 
+app.get('/with-nonce', (c) => {
+  c.header('content-security-policy', 'script-src-elem \'self\' \'nonce-ZMuLoN/taD7JZTUXfl5yvQ==\';')
+  return c.html('<h1>Hello Vite!</h1>')
+})
+
 app.get('/file.ts', (c) => {
   return c.text('console.log("exclude me!")')
 })

packages/dev-server/e2e/e2e.test.ts

@@ -17,6 +17,22 @@ test('Should contain an injected script tag', async ({ page }) => {
   const lastScriptTag = await page.$('script:last-of-type')
   expect(lastScriptTag).not.toBeNull()
 
+  const nonce = await lastScriptTag?.getAttribute('nonce')
+  expect(nonce).toBeNull()
+
+  const content = await lastScriptTag?.textContent()
+  expect(content).toBe('import("/@vite/client")')
+})
+
+test('Should contain an injected script tag with a nonce', async ({ page }) => {
+  await page.goto('/with-nonce')
+
+  const lastScriptTag = await page.$('script:last-of-type')
+  expect(lastScriptTag).not.toBeNull()
+
+  const nonce = await lastScriptTag?.getAttribute('nonce')
+  expect(nonce).not.toBeNull()
+
   const content = await lastScriptTag?.textContent()
   expect(content).toBe('import("/@vite/client")')
 })

packages/dev-server/e2e/mock/worker.ts

@@ -12,6 +12,11 @@ app.get('/', (c) => {
   return c.html('<h1>Hello Vite!</h1>')
 })
 
+app.get('/with-nonce', (c) => {
+  c.header('content-security-policy', 'script-src-elem \'self\' \'nonce-ZMuLoN/taD7JZTUXfl5yvQ==\';')
+  return c.html('<h1>Hello Vite!</h1>')
+})
+
 app.get('/name', (c) => c.html(`<h1>My name is ${c.env.NAME}</h1>`))
 
 app.get('/wait-until', (c) => {

packages/dev-server/src/dev-server.ts

@@ -164,7 +164,10 @@ export function devServer(options?: DevServerOptions): VitePlugin {
                 options?.injectClientScript !== false &&
                 response.headers.get('content-type')?.match(/^text\/html/)
               ) {
-                const script = '<script>import("/@vite/client")</script>'
+                const nonce = response.headers
+                  .get('content-security-policy')
+                  ?.match(/'nonce-([^']+)'/)?.[1]
+                const script = `<script${nonce ? ` nonce="${nonce}"` : ''}>import("/@vite/client")</script>`
                 return injectStringToResponse(response, script)
               }
               return response