repl: move completion logic to internal module by dario-piotrowicz · Pull Request #59889 · nodejs/node · GitHub

This PR moves the repl completion logic into its own internal module, my reasoning for proposing this change is that the repl completion logic currently occupies a big chunk of the repl module and it's hard to tell which functions are relevant to it and which are not.

So, also given the fact that the completion logic is pretty self contained, I believe that isolating it will lead to a better, more maintainable and more understandable code structure.

This is also consistent with the repl history which has its own internal module (and also the await module).

Later I am also planning to do other code restructuring/cleanups, but for this PR, in order to make it easy to review I tried to minimize as much as possible code changes and just tried to move things over the new internal completion module. So in this PR I basically only moved code from lib/repl.js to lib/internal/repl/completion.js, with the only exception being that I moved shared logic into the lib/internal/repl/utils.js (and imported it in the other 2 modules).

Codecov Report

❌ Patch coverage is 94.87472% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.53%. Comparing base (ed94bc4) to head (8663bb6).
⚠️ Report is 508 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/repl/completion.js	94.75%	38 Missing and 4 partials ⚠️
lib/internal/repl/utils.js	95.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #59889   +/-   ##
=======================================
  Coverage   88.52%   88.53%           
=======================================
  Files         703      704    +1     
  Lines      207825   207917   +92     
  Branches    40011    40014    +3     
=======================================
+ Hits       183982   184072   +90     
+ Misses      15864    15860    -4     
- Partials     7979     7985    +6

Files with missing lines	Coverage Δ
lib/repl.js	94.12% <100.00%> (-0.15%)	⬇️
lib/internal/repl/utils.js	96.37% <95.00%> (-0.11%)	⬇️
lib/internal/repl/completion.js	94.75% <94.75%> (ø)

... and 31 files with indirect coverage changes

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CI: https://ci.nodejs.org/job/node-test-pull-request/69245/

LGTM with a comment

It seems fine for this to just be it's own property that gets re-exported instead of being nested here and then accessed again in the public module (I am a bit confused what this is wrapping to get named a "wrapper")

I am using a wrapper here because the _builtinLibs value can be updated by users in the setters here: https://github.com/nodejs/node/blob/446cedcfb73300d32047c776d8ca7af92b803a48/lib/repl.js#L1399-L1429

And I wanted to make sure that all modules do get the potentially updated value in such case, that's why I used a wrapper to make sure that all get the same object and the _builtinLibs fields (updated or not) is shared among them.

Is this the wrong approach? do you see a better/simpler way to achieve this?

PS: note that the setters are deprecated to this should also be temporary, once those are removed in the future the wrapper can be removed anyways

friendly ping @joyeecheung 😊

Is this actually used here? If not maybe it can just be left in the public module?

Or you can just export methods for get/set it in this module, and let the public module's accessors forward to them? I think that more typically done for values kept in a module's singleton

Is this actually used here? If not maybe it can just be left in the public module?

it's used both in the public one and in a few places in the completion module (you can search for replBuiltinLibsWrapper._builtinLibs in the lib/internal/repl/completion.js file)

that's why I moved it here

Or you can just export methods for get/set it in this module, and let the public module's accessors forward to them? I think that more typically done for values kept in a module's singleton

right, good call, that does sound a bit cleaner actually 😃

Does this look ok to you? 🙂
1baac2f

I see, it might be useful to add a comment there about why this has to be accessed like this to maintain liveness in case someone tries to use it from a cached access.

done: 167ecc0 🙂

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- Loading data for nodejs/node/pull/59889
✔  Done loading data for nodejs/node/pull/59889
----------------------------------- PR info ------------------------------------
Title      repl: move completion logic to internal module (#59889)
Author     Dario Piotrowicz <dario.piotrowicz@gmail.com> (@dario-piotrowicz)
Branch     dario-piotrowicz:dario/repl-completion -> nodejs:main
Labels     repl, author ready, needs-ci, commit-queue-squash
Commits    3
 - repl: move completion logic to internal module
 - fixup! repl: move completion logic to internal module
 - fixup! repl: move completion logic to internal module
Committers 1
 - Dario Piotrowicz <dario.piotrowicz@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/59889
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/59889
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
--------------------------------------------------------------------------------
   ⚠  Commits were pushed since the last approving review:
   ⚠  - repl: move completion logic to internal module
   ⚠  - fixup! repl: move completion logic to internal module
   ⚠  - fixup! repl: move completion logic to internal module
   ℹ  This PR was created on Sun, 14 Sep 2025 23:27:29 GMT
   ✔  Approvals: 2
   ✔  - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/59889#pullrequestreview-3224294119
   ✔  - Joyee Cheung (@joyeecheung) (TSC): https://github.com/nodejs/node/pull/59889#pullrequestreview-3245397051
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2025-09-16T08:48:44Z: https://ci.nodejs.org/job/node-test-pull-request/69245/
   ⚠  Commits were pushed after the last Full PR CI run:
   ⚠  - repl: move completion logic to internal module
   ⚠  - fixup! repl: move completion logic to internal module
   ⚠  - fixup! repl: move completion logic to internal module
- Querying data for job/node-test-pull-request/69245/
   ✔  Last Jenkins CI successful
--------------------------------------------------------------------------------
   ✔  Aborted `git node land` session in /home/runner/work/node/node/.ncu

https://github.com/nodejs/node/actions/runs/18061998550

@jasnell @joyeecheung would you mind re-approving the PR after the latest commits so that commit-queue can succeed? 🙂🙏

remove replBuiltinLibsWrapper

add comment to `getReplBuiltinLibs` and `setReplyBuiltinLibs` functions

CI: https://ci.nodejs.org/job/node-test-pull-request/69592/

CI: https://ci.nodejs.org/job/node-test-pull-request/69599/

CI: https://ci.nodejs.org/job/node-test-pull-request/69603/

CI: https://ci.nodejs.org/job/node-test-pull-request/69608/

Landed in 200fe9e

This needs a backport to land on v24.x

PR-URL: nodejs#59889 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

PR-URL: #59889 Backport-PR-URL: #61046 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

nodejs-github-bot added needs-ci PRs that need a full CI run. repl Issues and PRs related to the REPL subsystem. labels Sep 14, 2025

dario-piotrowicz force-pushed the dario/repl-completion branch 4 times, most recently from 0db4da2 to 446cedc Compare September 14, 2025 23:54

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dario-piotrowicz added 3 commits October 5, 2025 17:03

repl: move completion logic to internal module

71b8416

fixup! repl: move completion logic to internal module

9516b3f

remove replBuiltinLibsWrapper

fixup! repl: move completion logic to internal module

8663bb6

add comment to `getReplBuiltinLibs` and `setReplyBuiltinLibs` functions

dario-piotrowicz force-pushed the dario/repl-completion branch from 167ecc0 to 8663bb6 Compare October 5, 2025 16:04

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nodejs-github-bot merged commit 200fe9e into nodejs:main Oct 8, 2025
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RafaelGSS mentioned this pull request Oct 13, 2025

2025-10-15, Version 25.0.0 (Current) #59896

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targos added backport-requested-v24.x PRs awaiting manual backport to the v24.x-staging branch. and removed backport-open-v24.x Indicate that the PR has an open backport labels Nov 18, 2025

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[v24.x backport] repl: move completion logic to internal module #61046

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aduh95 mentioned this pull request Feb 6, 2026

2026-02-10, Version 24.13.1 'Krypton' (LTS) #61661

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+                new SafeSet(vm.runInNewContext('Object.getOwnPropertyNames(globalThis)'));
+              const replBuiltinLibsWrapper = {
+                _builtinLibs: ArrayPrototypeFilter(

repl: move completion logic to internal module by dario-piotrowicz · Pull Request #59889 · nodejs/node · GitHub

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repl: move completion logic to internal module - #59889

repl: move completion logic to internal module#59889nodejs-github-bot merged 3 commits intonodejs:mainnodejs/node:mainfrom dario-piotrowicz:dario/repl-completiondario-piotrowicz/node:dario/repl-completionCopy head branch name to clipboard

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repl: move completion logic to internal module#59889
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