Ensure @swc/helpers do not rely on hoisting (#38174)

This ensures we properly alias and internalize `@swc/helpers` so that we don't rely on package managers hoisting this dependency for the build to work properly. This also disables the external helpers with `jest` as this can also require hoisting to work and doesn't provide as much of an optimization. 

## Bug

- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

Fixes: [slack thread](https://vercel.slack.com/archives/C0289CGVAR2/p1656437059151439)

packages/next/build/swc/options.js

@@ -56,7 +56,7 @@ function getBaseSWCOptions({
             paths,
           }
         : {}),
-      externalHelpers: !process.versions.pnp,
+      externalHelpers: !process.versions.pnp && !jest,
       parser: parserConfig,
       experimental: {
         keepImportAssertions: true,

packages/next/build/webpack-config.ts

@@ -678,6 +678,10 @@ export default async function getBaseWebpackConfig(
           }
         : {}),
 
+      '@swc/helpers': path.dirname(
+        require.resolve('@swc/helpers/package.json')
+      ),
+
       setimmediate: 'next/dist/compiled/setimmediate',
     },
     ...(isClient || isEdgeServer
@@ -816,6 +820,12 @@ export default async function getBaseWebpackConfig(
       }
     }
 
+    // @swc/helpers should not be external as it would
+    // require hoisting the package which we can't rely on
+    if (request.includes('@swc/helpers')) {
+      return
+    }
+
     // When in esm externals mode, and using import, we resolve with
     // ESM resolving options.
     const isEsmRequested = dependencyType === 'esm'

test/e2e/handle-non-hoisted-swc-helpers/index.test.ts

@@ -0,0 +1,38 @@
+import { createNext } from 'e2e-utils'
+import { NextInstance } from 'test/lib/next-modes/base'
+import { renderViaHTTP } from 'next-test-utils'
+
+describe('handle-non-hoisted-swc-helpers', () => {
+  let next: NextInstance
+
+  beforeAll(async () => {
+    next = await createNext({
+      files: {
+        'pages/index.js': `
+          export default function Page() { 
+            return <p>hello world</p>
+          } 
+          
+          export function getServerSideProps() {
+            const helper = require('@swc/helpers/lib/_object_spread.js')
+            console.log(helper)
+            return {
+              props: {
+                now: Date.now()
+              }
+            }
+          }
+        `,
+      },
+      installCommand:
+        'npm install; mkdir -p node_modules/next/node_modules/@swc; mv node_modules/@swc/helpers node_modules/next/node_modules/@swc/',
+      dependencies: {},
+    })
+  })
+  afterAll(() => next.destroy())
+
+  it('should work', async () => {
+    const html = await renderViaHTTP(next.url, '/')
+    expect(html).toContain('hello world')
+  })
+})

test/lib/create-next-install.js

@@ -55,12 +55,12 @@ async function createNextInstall(
   if (!(packageJson && packageJson.nextPrivateSkipLocalDeps)) {
     const pkgPaths = await linkPackages(tmpRepoDir)
     combinedDependencies = {
+      next: pkgPaths.get('next'),
       ...Object.keys(dependencies).reduce((prev, pkg) => {
         const pkgPath = pkgPaths.get(pkg)
         prev[pkg] = pkgPath || dependencies[pkg]
         return prev
       }, {}),
-      next: pkgPaths.get('next'),
     }
   }