fix: mixing namespace import and named import client components #64809

huozhi · 2024-04-20T00:01:49Z

What

Reported by @MaxLeiter, when you mixing named import and wildcard import to a client component, and if you clone the module it will missed others exports except the named ones. This lead to an issue that rendered React element type is undefined.

Why

We're using a tree-shaking strategy that collects the imported identifiers from client components on server components side. But in our code connection.dependency.ids can be undefined when you're using import *. So for that case we include all the exports.

In the flight client entry plugin, if we found there's named imports that collected later, and the module is already being marked as namespace import *, we merge the ids into "*", so the whole module and all exports are respected.

Now there're few possible cases for a client component import:

During webpack build, in the outout going connections, there're connection with empty imported ids ([]), cannot unable to detect the imported ids (['*']) and detected named imported ids (['a', 'b', ..]). First two represnt to include the whole module and all exports, but we might collect the named imports could come later than the whole module. So if we found the existing collection already has ['*'] then we keep using that regardless the collected named imports. This can avoid the collected named imports cover "exports all" case, where we will expose less exports for that collection module lead to the undefined component error.

Closes NEXT-3177

ijjk · 2024-04-20T00:07:47Z

Failing test suites

Commit: 6bc015b

TURBOPACK=1 pnpm test-start test/production/app-dir-edge-runtime-with-wasm/index.test.ts (turbopack)

app-dir edge runtime with wasm > should have built

Expand output

● app-dir edge runtime with wasm › should have built

next build failed with code/signal 1

  89 |           if (code || signal)
  90 |             reject(
> 91 |               new Error(`next build failed with code/signal ${code || signal}`)
     |               ^
  92 |             )
  93 |           else resolve()
  94 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:91:15)

● Test suite failed to run

TypeError: Cannot read properties of undefined (reading 'destroy')

  50 |     })
  51 |   })
> 52 |   afterAll(() => next.destroy())
     |                       ^
  53 |
  54 |   it('should have built', async () => {
  55 |     const html = await renderViaHTTP(next.url, '/')

  at Object.destroy (production/app-dir-edge-runtime-with-wasm/index.test.ts:52:23)

Read more about building and testing Next.js in contributing.md.

TURBOPACK=1 pnpm test-start test/e2e/prerender.test.ts (turbopack)

Prerender > should on-demand revalidate for fallback: blocking with onlyGenerated if generated

Expand output

● Prerender › should on-demand revalidate for fallback: blocking with onlyGenerated if generated

expect(received).toMatch(expected)

Expected pattern: /(HIT|STALE)/
Received string:  "MISS"

  2296 |
  2297 |         expect(initialTime).toBe($2('#time').text())
> 2298 |         expect(res2.headers.get('x-nextjs-cache')).toMatch(/(HIT|STALE)/)
       |                                                    ^
  2299 |
  2300 |         const res3 = await fetchViaHTTP(
  2301 |           next.url,

  at Object.toMatch (e2e/prerender.test.ts:2298:52)

Read more about building and testing Next.js in contributing.md.

ijjk · 2024-04-20T00:08:19Z

Stats from current PR

Default Build

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js fix/tree-shaking-import-wildcard	Change
buildDuration	25.5s	22.9s	N/A
buildDurationCached	11.9s	12.3s	⚠️ +403ms
nodeModulesSize	199 MB	199 MB	⚠️ +4.7 kB
nextStartRea..uration (ms)	746ms	674ms	N/A

Client Bundles (main, webpack)

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Client Build Manifests

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_buildManifest.js gzip	482 B	484 B	N/A
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Rendered Page Sizes

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link.html gzip	542 B	541 B	N/A
withRouter.html gzip	523 B	523 B	✓
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Edge SSR bundle Size

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page.js gzip	3.05 kB	3.04 kB	N/A
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Middleware size

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middleware-b..fest.js gzip	622 B	626 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	25.6 kB	25.6 kB	N/A
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Next Runtimes

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app-page-exp...dev.js gzip	171 kB	171 kB	✓
app-page-exp..prod.js gzip	97.6 kB	97.6 kB	✓
app-page-tur..prod.js gzip	99.4 kB	99.4 kB	✓
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pages.runtim..prod.js gzip	21.4 kB	21.4 kB	✓
server.runti..prod.js gzip	51.6 kB	51.6 kB	✓
Overall change	946 kB	946 kB	✓

build cache

	vercel/next.js canary	vercel/next.js fix/tree-shaking-import-wildcard	Change
0.pack gzip	1.6 MB	1.6 MB	N/A
index.pack gzip	107 kB	107 kB	N/A
Overall change	0 B	0 B	✓

Diff details

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@@ -1,7 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [8358],
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@@ -9,7 +9,7 @@
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@@ -18,7 +18,7 @@
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+    /***/ 8490: /***/ (module, exports, __webpack_require__) => {
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@@ -40,15 +40,15 @@
         __webpack_require__(422)
       );
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-        __webpack_require__(6074)
+        __webpack_require__(2457)
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-      const _imageconfigcontextsharedruntime = __webpack_require__(419);
-      const _warnonce = __webpack_require__(4486);
-      const _routercontextsharedruntime = __webpack_require__(162);
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+      const _imageconfig = __webpack_require__(5706);
+      const _imageconfigcontextsharedruntime = __webpack_require__(9483);
+      const _warnonce = __webpack_require__(9035);
+      const _routercontextsharedruntime = __webpack_require__(4829);
       const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(6996)
+        __webpack_require__(7240)
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       // This is replaced by webpack define plugin
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@@ -379,7 +379,7 @@
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@@ -395,9 +395,9 @@
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-      const _imageblursvg = __webpack_require__(133);
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@@ -889,7 +889,7 @@
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-      // EXTERNAL MODULE: ./node_modules/.pnpm/[email protected][email protected]/node_modules/next/image.js
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Commit: 6bc015b

packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts

@MaxLeiter

### What Reported by @MaxLeiter, when you mixing named import and wildcard import to a client component, and if you clone the module it will missed others exports except the named ones. This lead to an issue that rendered React element type is `undefined`. ### Why We're using a tree-shaking strategy that collects the imported identifiers from client components on server components side. But in our code `connection.dependency.ids` can be undefined when you're using `import *`. So for that case we include all the exports. In the flight client entry plugin, if we found there's named imports that collected later, and the module is already being marked as namespace import `*`, we merge the ids into "*", so the whole module and all exports are respected. Now there're few possible cases for a client component import: During webpack build, in the outout going connections, there're connection with empty imported ids (`[]`), cannot unable to detect the imported ids (`['*']`) and detected named imported ids (`['a', 'b', ..]`). First two represnt to include the whole module and all exports, but we might collect the named imports could come later than the whole module. So if we found the existing collection already has `['*']` then we keep using that regardless the collected named imports. This can avoid the collected named imports cover "exports all" case, where we will expose less exports for that collection module lead to the undefined component error. Closes NEXT-3177

huozhi added 2 commits April 20, 2024 01:14

repro

e6f6373

fix: mixing wildcard import and named import client components

abf2bdc

ijjk added created-by: Next.js team PRs by the Next.js team. tests type: next labels Apr 20, 2024

huozhi added 2 commits April 21, 2024 03:08

merge namespace and named imports into *

2e67d24

refactor

a36b73b

huozhi marked this pull request as ready for review April 21, 2024 01:27

huozhi requested review from timneutkens, ijjk, shuding, ztanner, feedthejim, a team and wyattjoh as code owners April 21, 2024 01:27

rename

b965f85

huozhi changed the title ~~fix: mixing wildcard import and named import client components~~ fix: mixing namespace import and named import client components Apr 21, 2024

shuding reviewed Apr 21, 2024

View reviewed changes

packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts Show resolved Hide resolved

huozhi added 2 commits April 21, 2024 11:19

add more test

a56105d

explain

5fdcc14

huozhi requested a review from shuding April 21, 2024 10:08

Merge branch 'canary' into fix/tree-shaking-import-wildcard

6bc015b

shuding approved these changes Apr 22, 2024

View reviewed changes

huozhi merged commit 7404ea4 into canary Apr 22, 2024
72 of 80 checks passed

huozhi deleted the fix/tree-shaking-import-wildcard branch April 22, 2024 13:05

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fix: mixing namespace import and named import client components #64809

fix: mixing namespace import and named import client components #64809

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fix: mixing namespace import and named import client components #64809

fix: mixing namespace import and named import client components #64809

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huozhi commented Apr 20, 2024 • edited Loading

What

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ijjk commented Apr 20, 2024 • edited Loading

Failing test suites

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Stats from current PR

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