module: CJS handle deleted directory relative require #42384

bmeck · 2022-03-17T21:03:14Z

This makes sure the following code works:

const fs = require('fs');
const path = require('path');
const dir = path.join(__dirname, 'delete_me');
fs.mkdirSync(dir, {
    recursive: true
});
const barPath = path.join(dir, 'bar.cjs');
fs.writeFileSync(barPath, `
    module.exports = () => require('../foo.cjs')
`);
const bar = require(barPath);
fs.rmSync(dir, {recursive: true});
require('assert').strict.equal(bar(), exports);

I found this while fixing up some policy stuff and realizing baseURL wouldn't work if synchronized to disk exactly right for things like, https://github.com/bmeck/local-fs-https-imports , due to an over eager optimization in the code.

nodejs-github-bot · 2022-03-17T21:03:17Z

Review requested:

@nodejs/modules

bmeck · 2022-03-17T21:13:37Z

we could also not use normalized form in the further parts of the PR if people are worried about compat

lib/internal/policy/manifest.js

nodejs-github-bot · 2022-10-28T12:38:50Z

CI: https://ci.nodejs.org/job/node-test-pull-request/47524/

nodejs-github-bot · 2022-10-29T12:00:15Z

CI: https://ci.nodejs.org/job/node-test-pull-request/47550/

nodejs-github-bot · 2022-10-29T20:25:09Z

CI: https://ci.nodejs.org/job/node-test-pull-request/47561/

ljharb · 2022-10-29T21:02:40Z

lib/internal/modules/cjs/loader.js

-    trailingSlash = RegExpPrototypeExec(trailingSlashRegex, request) !== null;
-  }
+  const trailingSlash = request.length > 0 &&
+    (StringPrototypeCharCodeAt(request, request.length - 1) === CHAR_FORWARD_SLASH || (


Is there a reason to use charcode instead of:

Suggested change

(StringPrototypeCharCodeAt(request, request.length - 1) === CHAR_FORWARD_SLASH || (

(request[request.length - 1] === '/' || (

?

I believe charcode comparison is faster

in recent v8? I’d love to see benchmarks for that!

Same here, I'd be up for landing this as is, and open a new PR to run benchmarks and see if that changes something.

Totally agree, perf changes should be done separately with benchmarks - i was thinking the simple string comparison was simpler than the charCode, and thus the better choice absent said benchmarks.

anonrig · 2022-10-29T22:54:03Z

lib/internal/modules/cjs/loader.js

-    CHAR_FORWARD_SLASH;
-  if (!trailingSlash) {
-    trailingSlash = RegExpPrototypeExec(trailingSlashRegex, request) !== null;
+  const trailingSlash = request.length > 0 &&


I believe storing request.length in a separate variable will result in faster code execution since the next 30~40 lines call request.length

Historically caching length lookups caused a huge perf hit, since it defeats a JIT optimization - not sure if that’s still true, but i doubt caching the length can beat the JIT.

I'd be up for landing this as is, and open a new PR to run benchmarks and see if that changes something.

nodejs-github-bot · 2022-10-31T19:54:00Z

Landed in ccd81e8

PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

PR-URL: nodejs#42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

nodejs/node#42384

* chore: bump node in DEPS to v18.13.0 * child_process: validate arguments for null bytes nodejs/node#44782 * bootstrap: merge main thread and worker thread initializations nodejs/node#44869 * module: ensure relative requires work from deleted directories nodejs/node#42384 * src: add support for externally shared js builtins nodejs/node#44000 * lib: disambiguate `native module` to `binding` nodejs/node#45673 * test: convert test-debugger-pid to async/await nodejs/node#45179 * deps: upgrade to libuv 1.44.2 nodejs/node#42340 * src: fix cppgc incompatibility in v8 nodejs/node#43521 * src: use qualified `std::move` call in node_http2 nodejs/node#45555 * build: fix env.h for cpp20 nodejs/node#45516 * test: remove experimental-wasm-threads flag nodejs/node#45074 * src: iwyu in cleanup_queue.cc nodejs/node#44983 * src: add missing include for `std::all_of` nodejs/node#45541 * deps: update ICU to 72.1 nodejs/node#45068 * chore: fixup patch indices * chore: remove errant semicolons - nodejs/node#44179 - nodejs/node#44193 * src: add support for externally shared js builtins nodejs/node#44376 * chore: add missing GN filenames * deps: update nghttp2 to 1.51.0 nodejs/node#45537 * chore: disable more Node.js snapshot tests The Snapshot feature is currently disabled * chore: disable ICU timezone tests Node.js uses a different version of ICU than Electron so they will often be out of sync. * chore: disable threadpool event tracing test Event tracing is not enabled in embedded Node.js * chore: fixup patch indices * chore: comments from review Co-authored-by: electron-roller[bot] <84116207+electron-roller[bot]@users.noreply.github.com> Co-authored-by: Shelley Vohr <[email protected]>

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bmeck changed the title ~~CJS handle deleted directory relative require~~ module: CJS handle deleted directory relative require Mar 18, 2022

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CI Reliability 2022-10-29 nodejs/reliability#414

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do not use regexes in module loader

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module: ensure relative requires work from deleted directories

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PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

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module: ensure relative requires work from deleted directories

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PR-URL: nodejs#42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

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module: ensure relative requires work from deleted directories

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PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

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module: ensure relative requires work from deleted directories

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PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

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v18.13.0 release proposal #46025

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module: ensure relative requires work from deleted directories

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PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

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module: ensure relative requires work from deleted directories

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PR-URL: #42384 Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>

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module: CJS handle deleted directory relative require #42384

module: CJS handle deleted directory relative require #42384

bmeck commented Mar 17, 2022 •

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nodejs-github-bot commented Oct 31, 2022

	(StringPrototypeCharCodeAt(request, request.length - 1) === CHAR_FORWARD_SLASH \|\| (
	(request[request.length - 1] === '/' \|\| (

module: CJS handle deleted directory relative require #42384

module: CJS handle deleted directory relative require #42384

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bmeck commented Mar 17, 2022 • edited Loading

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bmeck commented Mar 17, 2022 •

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