From c3e880f025591df69f56a729135bc5bb85fbbb4b Mon Sep 17 00:00:00 2001
From: SukkaW <isukkaw@gmail.com>
Date: Wed, 8 Jun 2022 18:24:20 +0800
Subject: [PATCH] chore: enable externalHelpers for precompile client code

---
 packages/next/taskfile-swc.js |  8 ++++++--
 packages/next/taskfile.js     | 10 ++++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/packages/next/taskfile-swc.js b/packages/next/taskfile-swc.js
index 52e2ce34ccaa7..bbef1fab59855 100644
--- a/packages/next/taskfile-swc.js
+++ b/packages/next/taskfile-swc.js
@@ -25,6 +25,7 @@ module.exports = function (task) {
 
       const isClient = serverOrClient === 'client'
 
+      /** @type {import('@swc/core').Options} */
       const swcClientOptions = {
         module: {
           type: 'commonjs',
@@ -32,7 +33,7 @@ module.exports = function (task) {
         },
         jsc: {
           loose: true,
-
+          externalHelpers: true,
           target: 'es2016',
           parser: {
             syntax: 'typescript',
@@ -55,6 +56,7 @@ module.exports = function (task) {
         },
       }
 
+      /** @type {import('@swc/core').Options} */
       const swcServerOptions = {
         module: {
           type: 'commonjs',
@@ -67,7 +69,9 @@ module.exports = function (task) {
         },
         jsc: {
           loose: true,
-
+          // Do not enable externalHelpers for server-side code
+          // @swc/helpers/_is_native_function.js is not compatible with edge-runtime
+          externalHelpers: false,
           parser: {
             syntax: 'typescript',
             dynamicImport: true,
diff --git a/packages/next/taskfile.js b/packages/next/taskfile.js
index b90e92f8b8ec6..169873b4af970 100644
--- a/packages/next/taskfile.js
+++ b/packages/next/taskfile.js
@@ -63,6 +63,12 @@ const externals = {
 
   'terser-webpack-plugin':
     'next/dist/build/webpack/plugins/terser-webpack-plugin',
+
+  /**
+   * TODO: add @swc/helpers as once ncc replaces ts-loader
+   * with swc-loader and externalHelpers becomes an option:
+   * https://github.com/vercel/ncc/pull/926/
+   */
 }
 // eslint-disable-next-line camelcase
 externals['node-html-parser'] = 'next/dist/compiled/node-html-parser'
@@ -1956,7 +1962,7 @@ export async function shared(task, opts) {
     .source(
       opts.src || 'shared/**/!(amp|config|constants|dynamic|head).+(js|ts|tsx)'
     )
-    .swc('server', { dev: opts.dev })
+    .swc('client', { dev: opts.dev })
     .target('dist/shared')
   notify('Compiled shared files')
 }
@@ -1966,7 +1972,7 @@ export async function shared_re_exported(task, opts) {
     .source(
       opts.src || 'shared/**/{amp,config,constants,dynamic,head}.+(js|ts|tsx)'
     )
-    .swc('server', { dev: opts.dev, interopClientDefaultExport: true })
+    .swc('client', { dev: opts.dev, interopClientDefaultExport: true })
     .target('dist/shared')
   notify('Compiled shared re-exported files')
 }