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no-scripts

**Note: This tool is still in development**

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no-scripts

Note: This tool is still in development

A CLI tool that checks your project's npm dependencies and alerts you if any of them define one of the npm lifecycle script that are automatically executed during npm install. Namely preinstall, install, postinstall, preuninstall and postuninstall.

Such scripts are typically no issue and might be required by a package to work properly. However, they can also pose a security threat as outlined here and here. The main danger being that a user is often not aware or fully in control of their execution.

This is a great tool to regularly execute in your CI so you can spot whether a dependency introduced an install script.

To further secure your system from such attacks you should consider having npm ignore all implicit scripts using the configuration command: npm config set ignore-scripts true
Note however that this disables any pre- and post-scripts, such as for example the commonly used pretest script.

Usage

no-scripts

By default, no-scripts will start by fetching the tarballs of all dependencies listed in the project's lockfile from the corresponding npm registry. It then evaluates the package.json files of every package, applying normalization using @npmcli/package-json in order to detect implicit install-scripts such as node-gyp rebuild which would be executed if a package contains *.gyp files.

Note: Local dependencies which are referenced via links or workspaces are not analyzed. You can use the --include-local option to additionally check them.

Ignore Dependencies

no-scripts --ignore esbuild

Include Local Dependencies

no-scripts --include-local

This mode operates fully offline and is therefore rather fast. However, since a malicious package that has already been installed could have altered it's own package.json during the postinstall phase, this mode might be fooled into thinking that a package has no scripts even though they were already executed. I have not yet evaluated the feasability of such an attack though.

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Package last updated on 16 Nov 2023

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