nodejs / nodejs/node

--disallow-code-generation-from-strings does not work as documented

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Dominant language
JavaScript
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Description

Doc: https://nodejs.org/docs/latest/api/cli.html#--disallow-code-generation-from-strings

It is advertised to cover built-in language features, but it doesn't cover data imports

No Node.js modules are directly imported here

// run with node and node --disallow-code-generation-from-strings
const payload = 'console.log("evaluated code from string")'
try { eval(payload) } catch (e) { console.log(e.message) }
try { new Function(payload)() } catch (e) { console.log(e.message) }
try { await import('data:text/javascript,' + payload) } catch (e) { console.log(e.message) }

Output:

% node --disallow-code-generation-from-strings 1.js
Code generation from strings disallowed for this context
Code generation from strings disallowed for this context
evaluated code from string

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Run the issue's 1.js reproduction with Node.js and with --disallow-code-generation-from-strings, then compare the eval, new Function, and data import results with the CLI documentation linked in the issue. Trace the handling of this option for data imports; done means the observed behavior matches the documented coverage, with regression coverage for all three cases.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, node.js
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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