keep pre-compiled acorn as external

packages/next/compiled/acorn/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2012-2020 by various contributors (see AUTHORS)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

packages/next/compiled/acorn/package.json

@@ -0,0 +1 @@
+{"name":"acorn","main":"acorn.js","license":"MIT"}

packages/next/taskfile.js

@@ -135,6 +135,15 @@ export async function ncc_node_fetch(task, opts) {
     .target('compiled/node-fetch')
 }
 
+// eslint-disable-next-line camelcase
+externals['acorn'] = 'next/dist/compiled/acorn'
+export async function ncc_acorn(task, opts) {
+  await task
+    .source(opts.src || relative(__dirname, require.resolve('acorn')))
+    .ncc({ packageName: 'acorn', externals })
+    .target('compiled/acorn')
+}
+
 // eslint-disable-next-line camelcase
 export async function ncc_next__react_dev_overlay(task, opts) {
   const overlayExternals = {
@@ -1578,6 +1587,7 @@ export async function ncc(task, opts) {
         'ncc_get_orientation',
         'ncc_hapi_accept',
         'ncc_node_fetch',
+        'ncc_acorn',
         'ncc_amphtml_validator',
         'ncc_arg',
         'ncc_async_retry',

packages/next/types/misc.d.ts

@@ -76,6 +76,10 @@ declare module 'next/dist/compiled/get-orientation' {
   export = m
 }
 
+declare module 'next/dist/compiled/acorn' {
+  import m from 'acorn'
+  export = m
+}
 declare module 'next/dist/compiled/amphtml-validator' {
   import m from 'amphtml-validator'
   export = m