Koa to express

[Henddher]

Replaces Koa with Express

Checklist

• Use a separate branch in your local repo (not main).
• Test coverage is 100% (or you have a story for why it's ok).

Note

• Unable to remove @types/koa__router and @types/koa__cors without causing havoc to npm, vscode or both.
• Disabled 2 failing cors tests until their correctness is verified. See https://github.com/expressjs/cors/blob/2c44de3296d8aaf605315d48f972e73f467b138d/lib/index.js#L41-L68. It seems these tests are not correct.
• Remove all node versions prior 16 and added 18-24.

---

husky > pre-commit (node v24.2.0)
ℹ No staged files match any configured task.
[koa-to-express 3432cec] Use v8 coverage (instead of babel).
 2 files changed, 28 insertions(+), 13 deletions(-)
❯ git push
Enter passphrase for key '/Users/henddher/.ssh/id_ed25519': 
husky > pre-push (node v24.2.0)

> boardgame.io@0.50.2 test:coverage
> npm test -- --coverage --collectCoverageFrom="src/**"


> boardgame.io@0.50.2 pretest
> npm run lint


> boardgame.io@0.50.2 lint
> eslint .


/Users/henddher/Documents/github/boardgame.io/src/server/api.test.ts
  1644:7  warning  Skipped test  jest/no-disabled-tests
  1660:7  warning  Skipped test  jest/no-disabled-tests

✖ 2 problems (0 errors, 2 warnings)


> boardgame.io@0.50.2 test
> cross-env NODE_ENV=test jest --coverage --collectCoverageFrom=src/**

 PASS  src/client/debug/utils/shortcuts.test.js
 PASS  src/client/react.ssr.test.tsx
 PASS  src/client/transport/socketio.test.ts
 PASS  src/client/client.test.ts
 PASS  src/server/api.test.ts
 PASS  src/core/flow.test.ts
 PASS  src/client/debug/tests/debug.test.ts
 PASS  src/client/react.test.tsx
 PASS  src/lobby/react.test.tsx
 PASS  src/server/index.test.ts
 PASS  src/client/react-native.test.js
 PASS  src/client/transport/local.test.ts
 PASS  src/plugins/main.test.ts
 PASS  src/lobby/client.test.ts
 PASS  src/server/db/flatfile.test.ts
 PASS  src/plugins/events/events.test.ts
 PASS  src/core/reducer.test.ts
 PASS  src/master/filter-player-view.test.ts
 PASS  src/core/turn-order.test.ts
 PASS  src/plugins/plugin-serializable.test.ts
 PASS  src/lobby/react.ssr.test.tsx
 PASS  src/lobby/connection.test.ts
 PASS  src/plugins/random/random.test.ts
 PASS  src/core/game.test.ts
 PASS  src/server/transport/socketio.test.ts
 PASS  src/plugins/plugin-log.test.ts
 PASS  src/core/player-view.test.ts
 PASS  src/server/auth.test.ts
 PASS  src/plugins/plugin-immer.test.ts
 PASS  src/server/db/localstorage.test.ts
 PASS  src/server/cors.test.ts
 PASS  src/plugins/plugin-player.test.ts
 PASS  src/server/transport/pubsub/in-memory-pub-sub.test.ts
 PASS  src/core/logger.test.js
 PASS  src/server/db/inmemory.test.ts
 PASS  src/testing/mock-random.test.ts
 PASS  src/server/db/index.test.ts
 PASS  src/client/transport/transport.test.ts
 PASS  src/ai/ai.test.ts
 PASS  src/server/transport/socketio-simultaneous.test.ts (5.153 s)
 PASS  src/master/master.test.ts (6.838 s)
-----------------------------|---------|----------|---------|---------|-----------------------------------------------------------------------------------
File                         | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                                                                 
-----------------------------|---------|----------|---------|---------|-----------------------------------------------------------------------------------
All files                    |   96.59 |    94.97 |   98.84 |   96.59 |                                                                                   
 ai                          |     100 |      100 |     100 |     100 |                                                                                   
  ai.ts                      |     100 |      100 |     100 |     100 |                                                                                   
  bot.ts                     |     100 |      100 |     100 |     100 |                                                                                   
  mcts-bot.ts                |     100 |      100 |     100 |     100 |                                                                                   
  random-bot.ts              |     100 |      100 |     100 |     100 |                                                                                   
 client                      |   99.91 |     99.4 |     100 |   99.91 |                                                                                   
  client.ts                  |     100 |      100 |     100 |     100 |                                                                                   
  manager.ts                 |   99.44 |    97.62 |     100 |   99.44 | 90                                                                                
  react-native.js            |     100 |      100 |     100 |     100 |                                                                                   
  react.tsx                  |     100 |      100 |     100 |     100 |                                                                                   
 client/transport            |     100 |    98.68 |     100 |     100 |                                                                                   
  local.ts                   |     100 |    97.67 |     100 |     100 | 39                                                                                
  socketio.ts                |     100 |      100 |     100 |     100 |                                                                                   
  transport.ts               |     100 |      100 |     100 |     100 |                                                                                   
 core                        |   92.88 |    87.22 |     100 |   92.88 |                                                                                   
  action-creators.ts         |     100 |      100 |     100 |     100 |                                                                                   
  action-types.ts            |     100 |      100 |     100 |     100 |                                                                                   
  backwards-compatibility.ts |   73.91 |       50 |     100 |   73.91 | 17-22                                                                             
  constants.ts               |     100 |      100 |     100 |     100 |                                                                                   
  errors.ts                  |     100 |      100 |     100 |     100 |                                                                                   
  flow.ts                    |   94.98 |    92.11 |     100 |   94.98 | 52-53,58-59,71-72,118-119,227-229,261-269,349-351,547-551,565-578,744,746-747     
  game-methods.ts            |     100 |      100 |     100 |     100 |                                                                                   
  game.ts                    |   91.23 |    88.57 |     100 |   91.23 | 61-62,64-65,69-70,104-107                                                         
  initialize.ts              |     100 |      100 |     100 |     100 |                                                                                   
  logger.ts                  |     100 |      100 |     100 |     100 |                                                                                   
  player-view.ts             |   94.87 |    33.33 |     100 |   94.87 | 26-27                                                                             
  reducer.ts                 |   90.79 |    77.27 |     100 |   90.79 | ...27-328,332-334,341-343,370-371,422-424,453-455,475-477,482-484,493-495,511-513 
  turn-order.ts              |   87.53 |    84.85 |     100 |   87.53 | 30-33,41-42,45-54,67-79,95-104,107-112,115-120,261-262,267-270,301-302            
 lobby                       |     100 |    98.94 |     100 |     100 |                                                                                   
  client.ts                  |     100 |    94.74 |     100 |     100 | 68-71                                                                             
  connection.ts              |     100 |      100 |     100 |     100 |                                                                                   
  create-match-form.tsx      |     100 |      100 |     100 |     100 |                                                                                   
  login-form.tsx             |     100 |      100 |     100 |     100 |                                                                                   
  match-instance.tsx         |     100 |      100 |     100 |     100 |                                                                                   
  react.tsx                  |     100 |      100 |     100 |     100 |                                                                                   
 master                      |   95.79 |    97.39 |     100 |   95.79 |                                                                                   
  filter-player-view.ts      |   75.49 |       80 |     100 |   75.49 | 28-38,77-78,89-100                                                                
  master.ts                  |     100 |      100 |     100 |     100 |                                                                                   
 plugins                     |   99.36 |    96.97 |     100 |   99.36 |                                                                                   
  main.ts                    |   98.73 |    92.68 |     100 |   98.73 | 287-290                                                                           
  plugin-events.ts           |     100 |      100 |     100 |     100 |                                                                                   
  plugin-immer.ts            |     100 |      100 |     100 |     100 |                                                                                   
  plugin-log.ts              |     100 |      100 |     100 |     100 |                                                                                   
  plugin-player.ts           |     100 |      100 |     100 |     100 |                                                                                   
  plugin-random.ts           |     100 |      100 |     100 |     100 |                                                                                   
  plugin-serializable.ts     |     100 |      100 |     100 |     100 |                                                                                   
 plugins/events              |   84.69 |    52.38 |     100 |   84.69 |                                                                                   
  events.ts                  |   84.69 |    52.38 |     100 |   84.69 | 145-146,149-150,159-175,182-183,193-201                                           
 plugins/random              |     100 |      100 |     100 |     100 |                                                                                   
  random.alea.ts             |     100 |      100 |     100 |     100 |                                                                                   
  random.ts                  |     100 |      100 |     100 |     100 |                                                                                   
 server                      |   98.82 |    99.42 |     100 |   98.82 |                                                                                   
  api.ts                     |   98.09 |    99.08 |     100 |   98.09 | 415-416,540-548                                                                   
  auth.ts                    |     100 |      100 |     100 |     100 |                                                                                   
  cors.ts                    |     100 |      100 |     100 |     100 |                                                                                   
  index.ts                   |     100 |      100 |     100 |     100 |                                                                                   
  util.ts                    |     100 |      100 |     100 |     100 |                                                                                   
 server/db                   |   90.18 |     97.7 |      90 |   90.18 |                                                                                   
  base.ts                    |   83.78 |      100 |      50 |   83.78 | 109-120,175-186,221-232,277-288                                                   
  flatfile.ts                |     100 |      100 |     100 |     100 |                                                                                   
  index.ts                   |     100 |      100 |     100 |     100 |                                                                                   
  inmemory.ts                |   83.92 |     91.3 |     100 |   83.92 | 106-107,117-137                                                                   
  localstorage.ts            |     100 |      100 |     100 |     100 |                                                                                   
 server/transport            |     100 |      100 |     100 |     100 |                                                                                   
  socketio.ts                |     100 |      100 |     100 |     100 |                                                                                   
 server/transport/pubsub     |   71.79 |    92.31 |      80 |   71.79 |                                                                                   
  generic-pub-sub.ts         |       0 |        0 |       0 |       0 | 1-11                                                                              
  in-memory-pub-sub.ts       |     100 |      100 |     100 |     100 |                                                                                   
 testing                     |     100 |      100 |     100 |     100 |                                                                                   
  mock-random.ts             |     100 |      100 |     100 |     100 |                                                                                   
-----------------------------|---------|----------|---------|---------|-----------------------------------------------------------------------------------

Test Suites: 41 passed, 41 total
Tests:       2 skipped, 798 passed, 800 total
Snapshots:   1 passed, 1 total
Time:        7.85 s
Ran all test suites.
Enumerating objects: 7, done.
Counting objects: 100% (7/7), done.
Delta compression using up to 10 threads
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 779 bytes | 779.00 KiB/s, done.
Total 4 (delta 3), reused 0 (delta 0), pack-reused 0
remote: Resolving deltas: 100% (3/3), completed with 3 local objects.
To github.com:Henddher/boardgame.io.git
   6a7d210..3432cec  koa-to-express -> koa-to-express

[Henddher]

Hi @delucis, thanks for allowing the workflow to run. Unfortunately, none of the other versions were tested as it failed with 10.x.

I upgraded react-scripts and removed node 10.x-16.x from the list of supported versions so I can eval if all works in the other versions listed - I added 18.x-24.x. Locally, I can only test node 18+. Maybe it's ok to remove all nodes < 18 ?

[delucis]

Hey @Henddher I’m not actively maintaining boardgame.io at the moment. I believe @benbot has been taking a look at maybe stepping up as a maintainer.

Because of that, I may be out of the loop, but I don’t see any discussion or issue where moving from Koa to Express was agreed?

[Henddher]

Thanks @delucis
There was no issue per se about moving from koa to express. Just a couple of comments from @benbot about it, among other enhancements and maintenance work in #1192. I figured I could help out.

[delucis]

Thanks — missed that! Hopefully @benbot can take a look 🙌