An install script is code tied to the process of setting up software. The term has no single meaning. In PowerShell, it can mean a script file you download with Install-Script. In npm, Composer and similar tools, it usually means a hook that runs commands automatically while a package is being installed. The two are different, and the difference matters for security.
Two meanings of “install script”
When someone uses the phrase, ask whether the script is being installed or run during installation.
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- A script installed as a file. The script is the thing you are acquiring. It is copied into place, and you decide when to run it.
- A script executed by a package manager during installation. The script is a side effect of installing something else. It is a hook that triggers at a defined point in the install process, often without you reading it first.
Each tool defines its own behavior, defaults and controls, so name the platform and the command when you use the term.
What an install script does
Install-time hooks automate setup that a package cannot do by simply copying files. npm’s security guidance describes uses such as configuration and compiling binary dependencies (npm security post). Typical jobs include:
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- Compiling native code for the machine it is installed on.
- Writing configuration or generating files.
- Preparing the project after dependencies are in place.
Examples by platform
| Tool | What “install script” refers to | Runs automatically? |
|---|---|---|
| npm | Lifecycle scripts preinstall, install and postinstall in a package’s metadata |
Historically yes; current versions add approval controls (see below) |
| PowerShell | A script file fetched by the Install-Script cmdlet |
No. It is copied to an installation location, not executed by the install step |
| Composer (PHP) | Scripts bound to events such as pre-install-cmd and post-install-cmd |
Runs when the bound event fires |
npm lifecycle scripts
npm’s scripts documentation explains the order in which lifecycle scripts run. It also advises package authors to consider package metadata or other mechanisms before adding an install or preinstall hook, because such hooks are often unnecessary.
npm now documents ways to control these hooks for dependencies. The npm install-scripts command and the allowScripts policy manage which scripts are approved, and the npm install documentation describes how unapproved scripts are handled and how to enforce a strict policy. These details depend on npm version and configuration, so read the documentation that matches your installed CLI (the links above are for npm CLI v11).
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PowerShell Install-Script
Microsoft describes Install-Script as getting a script from a repository, verifying that it is a valid PowerShell script, and copying it to an installation location. Here the “install script” is the payload. It is not a hook that runs on someone else’s install.
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Composer scripts can be PHP callbacks or executable commands. They attach to named events, including pre-install-cmd and post-install-cmd.
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Why automatic execution is a security issue
A hook is ordinary code running with your account’s access at the moment you install. A malicious package can therefore run code just by being installed, before you ever import or use it. npm’s security post puts it plainly: “You should not execute any software downloaded from the Internet if you do not trust it, including software downloaded from npm.” (npm)
The EU’s cybersecurity agency ENISA reaches a similar conclusion in its Technical Advisory for Secure Use of Package Managers. It recommends inspecting lifecycle scripts and preventing or restricting installation scripts to reduce attack surface.
How to handle install scripts safely
- Identify the source. Find which package supplies the hook, not just which top-level dependency you asked for.
- Read what it does. Check the commands in the package metadata and any files they call.
- Ask whether it is needed. See whether the package works without the hook.
- Use the tool’s policy controls. For npm, that means the allow, deny and approval features above. Do not switch off every restriction without understanding what you are giving up.
- Confirm version behavior. Defaults differ between tools and between versions of the same tool.
Comparing two install-script mechanisms
To judge any tool, check these points:
- Is the script only copied into place, or is it executed automatically?
- Which lifecycle event triggers it?
- What permissions and environment does it get?
- Is execution allowed, denied or sandboxed by default?
- What review and logging controls does the package manager offer?
The sources cited here support timing, policy and inspection as the key concerns. Permissions and sandboxing vary by platform, so check each tool’s own documentation rather than assuming npm’s behavior applies.
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