Next.js: next export adds all hot-update files

[iamstarkov]

Bug report

all in a title; details are below

Describe the bug

if you develop next.js site for awhile and then run next export in the out folder you will get a lot of hot-update files in an out folder, which are required only for development and redundant for prod

That makes now deployment pretty slow, I unexpectedly got 248 files to deploy for my next-js based version of a blog.

To Reproduce

curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/basic-export
cd basic-export/
atom . # or vim .
yarn
yarn dev
# open http://localhost:3000
# change ./pages/index.js few times
# make sure to get few hot updates
# stop
yarn build
yarn export
tree out/ | grep hot
tree out/ | grep hot | wc -l # 16

full log

~/projects/oss
☯ curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/basic-export
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1766k    0 1766k    0     0   849k      0 --:--:--  0:00:02 --:--:--  849k

~/projects/oss
☯ cd basic-export/

~/projects/oss/basic-export
☯ atom .

~/projects/oss/basic-export
☯ yarn
yarn install v1.9.4
info No lockfile found.
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 📃  Building fresh packages...
success Saved lockfile.
✨  Done in 15.50s.

~/projects/oss/basic-export
☯ yarn dev
yarn run v1.9.4
$ next
✔ success server compiled in 163ms
✔ success client compiled in 838ms


 DONE  Compiled successfully in 1658ms                                                        16:06:03

> Ready on http://localhost:3000


 WAIT  Compiling...                                                                           16:06:03

✔ success client compiled in 64ms


 DONE  Compiled successfully in 122ms                                                         16:06:03

> Building page: /


 WAIT  Compiling...                                                                           16:06:46

✔ success server compiled in 1s 190ms
✔ success client compiled in 1s 344ms


 DONE  Compiled successfully in 1377ms                                                        16:06:48



 WAIT  Compiling...                                                                           16:07:27

✔ success server compiled in 236ms
✔ success client compiled in 224ms


 DONE  Compiled successfully in 304ms                                                         16:07:27



 WAIT  Compiling...                                                                           16:07:31

✔ success client compiled in 164ms


 DONE  Compiled successfully in 192ms                                                         16:07:32

✔ success server compiled in 227ms


 WAIT  Compiling...                                                                           16:07:37

✔ success client compiled in 124ms


 DONE  Compiled successfully in 154ms                                                         16:07:37

✔ success server compiled in 198ms


 WAIT  Compiling...                                                                           16:07:38

✔ success client compiled in 200ms


 DONE  Compiled successfully in 225ms                                                         16:07:39

✔ success server compiled in 263ms


 WAIT  Compiling...                                                                           16:07:40

✔ success client compiled in 195ms


 DONE  Compiled successfully in 220ms                                                         16:07:40

✔ success server compiled in 265ms
^C
got signal SIGINT, exiting

~/projects/oss/basic-export
☯ yarn build
yarn run v1.9.4
$ next build
[16:08:18] Compiling client
[16:08:18] Compiling server
[16:08:19] Compiled server in 969ms
[16:08:23] Compiled client in 5s
✨  Done in 7.03s.

~/projects/oss/basic-export
☯ yarn export
yarn run v1.9.4
$ next export
> using build directory: /Users/vlasta/projects/oss/basic-export/.next
  copying "static build" directory
> No "exportPathMap" found in "next.config.js". Generating map from "./pages"
> exporting path: /about
> exporting path: /about2
> exporting path: /day
> exporting path: /index
> exporting path: /404
> exporting path: /

Export successful
✨  Done in 0.64s.

~/projects/oss/basic-export
☯ tree out/ | grep hot
│           ├── 23406fc088aa2cd5d5cc.hot-update.json
│           ├── 63ab2713fe0a0c0ca18a.hot-update.json
│           ├── 8a557812ce01101491df.hot-update.json
│           ├── 9fba8f1c8050faa909b4.hot-update.json
│           ├── a06dadb8d20686abb97f.hot-update.json
│           ├── b2b8fb449294bf75a044.hot-update.json
│                       ├── index.js.23406fc088aa2cd5d5cc.hot-update.js
│                       ├── index.js.23406fc088aa2cd5d5cc.hot-update.js.map
│                       ├── index.js.63ab2713fe0a0c0ca18a.hot-update.js
│                       ├── index.js.63ab2713fe0a0c0ca18a.hot-update.js.map
│                       ├── index.js.8a557812ce01101491df.hot-update.js
│                       ├── index.js.8a557812ce01101491df.hot-update.js.map
│                       ├── index.js.9fba8f1c8050faa909b4.hot-update.js
│                       ├── index.js.9fba8f1c8050faa909b4.hot-update.js.map
│                       ├── index.js.b2b8fb449294bf75a044.hot-update.js
│                       └── index.js.b2b8fb449294bf75a044.hot-update.js.map

~/projects/oss/basic-export
☯ tree out/ | grep hot | wc -l
      16

Expected behavior

out folder should not have dev-only files, like hot-update files

Screenshots

System information

• OS: macOS 10.14 (18A391)
• Version of Next.js: 7.0.2

[iamstarkov]

Workaround is to adjust export script:

// package.json
  scripts: {
    "export": "rm -rf .next out && next build && next export"
  }

[andersonleite]

PR
https://github.com/zeit/next.js/pull/6003

[timneutkens]

Closing this in favor of #6009