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module: fix require in node repl #30835

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@ZYSzys ZYSzys commented Dec 7, 2019

Fixes: #30808

In REPL, module.filename is null, and for relative path modules, we shouldn't look up relative modules from node_modules.

> module.filename
null
>
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@ZYSzys ZYSzys requested a review from bmeck December 7, 2019 13:24
@ZYSzys ZYSzys added module Issues and PRs related to the module subsystem. repl Issues and PRs related to the REPL subsystem. labels Dec 7, 2019
@ZYSzys ZYSzys removed the request for review from bmeck December 7, 2019 13:24
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// from realpath(__filename) but with eval there is no filename
const mainPaths = ['.'].concat(Module._nodeModulePaths('.'), modulePaths);
// from realpath(__filename) but in REPL there is no filename
const mainPaths = ['.'];
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With --eval, parent has both id and filename set now, so I think this edge case wasn't for --eval anymore but for REPL mode.

> node --eval 'console.log(module)'
Module {
  id: '[eval]',
  path: '.',
  exports: {},
  parent: undefined,
  filename: '/Users/zyszys/Projects/nodejs/node/[eval]',
  loaded: false,
  children: [],
  paths: [
    '/Users/zyszys/Projects/nodejs/node/node_modules',
    '/Users/zyszys/Projects/nodejs/node_modules',
    '/Users/zyszys/Projects/node_modules',
    '/Users/zyszys/node_modules',
    '/Users/node_modules',
    '/node_modules'
  ]
}

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This does seem correct. It would still be good to get another review from e.g. @devsnek or @guybedford though.

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Can you confirm that node --eval 'require("pkg")' where the file system looks like:

/path/to/cwd/
/path/to/node_modules/pkg/index.js

and the node process is running in the /path/to/cwd/ folder?

If we are cutting off those node_modules lookups that seems odd to me.

Edit: Misunderstood this was a relative code path, all seems good.

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Seems good. Missed that this code path is specifically for relative modules (seems I incorrectly expected that resolveLookupPaths would never even apply to relative paths in the first place).

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ZYSzys added a commit that referenced this pull request Dec 10, 2019
Fixes: #30808

PR-URL: #30835
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Guy Bedford <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
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ZYSzys commented Dec 10, 2019

Landed in 7629fb2.

@ZYSzys ZYSzys closed this Dec 10, 2019
@ZYSzys ZYSzys deleted the repl-require branch December 10, 2019 04:06
targos pushed a commit that referenced this pull request Dec 10, 2019
Fixes: #30808

PR-URL: #30835
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Guy Bedford <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Dec 13, 2019
targos pushed a commit that referenced this pull request Jan 14, 2020
Fixes: #30808

PR-URL: #30835
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Guy Bedford <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
BethGriggs pushed a commit that referenced this pull request Feb 6, 2020
Fixes: #30808

PR-URL: #30835
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Guy Bedford <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
@MylesBorins MylesBorins mentioned this pull request Feb 8, 2020
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Surprising require('./file') behavior when ran from REPL
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