repl: support --loader option in builtin REPL #33437

targos · 2020-05-16T14:34:05Z

I'll try to write a test if there are no objections to the change.

/cc @nodejs/modules-active-members

targos · 2020-05-16T14:38:20Z

With the example from the issue:

$ echo 'console.log("hooks executing")' > hooks.mjs
$ ./node --loader ./hooks.mjs
(node:1190852) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
hooks executing
Welcome to Node.js v15.0.0-pre.
Type ".help" for more information.

With a wrong path:

$ ./node --loader ./hooks.js
(node:1190903) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
internal/main/repl.js:70
    internalBinding('errors').triggerUncaughtException(
                              ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/home/mzasso/git/nodejs/node/hooks.js' imported from /home/mzasso/git/nodejs/node/
    at finalizeResolution (internal/modules/esm/resolve.js:284:11)
    at moduleResolve (internal/modules/esm/resolve.js:662:10)
    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:752:11)
    at Loader.resolve (internal/modules/esm/loader.js:97:40)
    at Loader.getModuleJob (internal/modules/esm/loader.js:242:28)
    at Loader.import (internal/modules/esm/loader.js:177:28)
    at internal/process/esm_loader.js:55:31
    at Object.initializeLoader (internal/process/esm_loader.js:60:5)
    at internal/main/repl.js:37:13 {
  code: 'ERR_MODULE_NOT_FOUND'

With error in the loader code:

$ echo 'throw new Error("test")' > hooks.mjs
$ ./node --loader ./hooks.mjs
(node:1190987) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
file:///home/mzasso/git/nodejs/node/hooks.mjs:1
throw new Error("test")
      ^

Error: test
    at file:///home/mzasso/git/nodejs/node/hooks.mjs:1:7
    at ModuleJob.run (internal/modules/esm/module_job.js:138:23)
    at async Loader.import (internal/modules/esm/loader.js:178:24)
    at async internal/process/esm_loader.js:55:9

lib/internal/main/repl.js

BridgeAR

I am fine with adding this feature. It would be good in general to support esm better in the REPL.

lib/internal/main/repl.js

devsnek · 2020-05-16T22:20:43Z

Maybe this is too heavy for this pr, but refactoring internal/process/esm_loader to gate exposing the loader instance behind a function which also ensures the loader is properly initialized would be nice.

BridgeAR · 2020-05-27T23:40:57Z

Ping @targos

targos · 2020-05-29T18:13:12Z

Updated with a different approach. PTAL.

devsnek · 2020-05-29T18:16:17Z

lib/internal/process/esm_loader.js

+
+exports.loadESM = async function loadESM(callback) {
+  try {
+    await initializeLoader();


should probably gate this on ESMLoader being undefined

do you mean add something like assert(ESMLoader === undefined) ?

yeah that works.

I can't. There's a default loader defined above, and removing it breaks things.

BridgeAR

LGTM

nodejs-github-bot · 2020-05-31T09:36:07Z

CI: https://ci.nodejs.org/job/node-test-pull-request/31669/

nodejs-github-bot · 2020-06-06T10:37:29Z

CI: https://ci.nodejs.org/job/node-test-pull-request/31748/

nodejs-github-bot · 2020-06-16T07:52:45Z

CI: https://ci.nodejs.org/job/node-test-pull-request/31883/

nodejs-github-bot · 2020-06-16T07:52:46Z

CI: https://ci.nodejs.org/job/node-test-pull-request/31884/

Fixes: nodejs#33435

nodejs-github-bot · 2020-07-14T08:08:05Z

CI: https://ci.nodejs.org/job/node-test-pull-request/32325/

nodejs-github-bot · 2020-07-14T08:57:35Z

CI: https://ci.nodejs.org/job/node-test-pull-request/32326/

Fixes: #33435 PR-URL: #33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

targos · 2020-07-14T13:21:45Z

Landed in 05539c1

Fixes: #33435 PR-URL: #33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

codebytere · 2020-09-27T17:29:13Z

@targos could you please backport this to v12.x?

Fixes: nodejs#33435 PR-URL: nodejs#33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Fixes: #33435 PR-URL: #33437 Backport-PR-URL: #35394 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

targos mentioned this pull request May 16, 2020

node --loader for REPL (without entrypoint) does not execute loader #33435

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targos force-pushed the repl-loader branch from a42fbf0 to 4f00b09 Compare May 29, 2020 18:10

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BridgeAR force-pushed the master branch 2 times, most recently from 8ae28ff to 2935f72 Compare May 31, 2020 12:18

This was referenced Jun 4, 2020

CI Relability 2020-06-04 JaneaSystems/nodejs-reliability#3

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targos force-pushed the repl-loader branch from 4f00b09 to fd16758 Compare June 16, 2020 07:52

repl: support --loader option in builtin REPL

dc45738

Fixes: nodejs#33435

targos force-pushed the repl-loader branch from fd16758 to dc45738 Compare July 14, 2020 08:05

targos added a commit that referenced this pull request Jul 14, 2020

repl: support --loader option in builtin REPL

05539c1

Fixes: #33435 PR-URL: #33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

targos closed this Jul 14, 2020

targos deleted the repl-loader branch July 14, 2020 13:21

MylesBorins pushed a commit that referenced this pull request Jul 14, 2020

repl: support --loader option in builtin REPL

e5da23e

Fixes: #33435 PR-URL: #33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

MylesBorins mentioned this pull request Jul 14, 2020

v14.6.0 proposal #34371

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CI Relability 2020-07-15 JaneaSystems/nodejs-reliability#38

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MylesBorins pushed a commit that referenced this pull request Jul 16, 2020

repl: support --loader option in builtin REPL

73d6792

Fixes: #33435 PR-URL: #33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

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cjihrig pushed a commit that referenced this pull request Jul 23, 2020

repl: support --loader option in builtin REPL

7ca70e4

Fixes: #33435 PR-URL: #33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

codebytere added the backport-requested-v12.x label Sep 27, 2020

targos added backport-open-v12.x and removed backport-requested-v12.x labels Sep 28, 2020

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repl: support --loader option in builtin REPL

ee7cae2

Fixes: nodejs#33435 PR-URL: nodejs#33437 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

targos mentioned this pull request Sep 28, 2020

[v12.x backport] repl: support --loader option in builtin REPL #35394

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addaleax pushed a commit that referenced this pull request Sep 28, 2020

repl: support --loader option in builtin REPL

b7be751

Fixes: #33435 PR-URL: #33437 Backport-PR-URL: #35394 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

codebytere mentioned this pull request Oct 4, 2020

v12.19.0 proposal #35401

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repl: support --loader option in builtin REPL #33437

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repl: support --loader option in builtin REPL #33437

repl: support --loader option in builtin REPL #33437

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