Files
bun.sh/docs/pm/lifecycle.mdx
robobun 0c42b46af3 docs: remove outdated version mentions (1.0.x and 1.1.x) (#24570)
## Summary

Remove outdated version mentions (1.0.x and 1.1.x) from documentation
for better consistency. These versions are over a year old - you should
be using a recent version of bun :).

## What changed

**Removed version mentions from:**
- `docs/pm/lifecycle.mdx` - v1.0.16 (trusted dependencies)
- `docs/bundler/executables.mdx` - v1.0.23, v1.1.25, v1.1.30 (various
features)
- `docs/guides/install/jfrog-artifactory.mdx` - v1.0.3+ (env var
comment)
- `docs/guides/install/azure-artifacts.mdx` - v1.0.3+ (env var comment)
- `docs/runtime/workers.mdx` - v1.1.13, v1.1.35 (blob URLs, preload)
- `docs/runtime/networking/dns.mdx` - v1.1.9 (DNS caching)
- `docs/guides/runtime/import-html.mdx` - v1.1.5
- `docs/guides/runtime/define-constant.mdx` - v1.1.5
- `docs/runtime/sqlite.mdx` - v1.1.31

**Kept version mentions in:**
- All 1.2.x versions (still recent, less than a year old)
- Benchmark version numbers (e.g., S3 performance comparison with
v1.1.44)
- `docs/guides/install/yarnlock.mdx` (bun.lock introduction context)
- `docs/project/building-windows.mdx` (build requirements)
- `docs/runtime/http/websockets.mdx` (performance benchmarks)

## Why

The docs lack consistency around version mentions - we don't document
every feature's version, so keeping scattered old version numbers looks
inconsistent. These changes represent a small percentage of features
added recently, and users on ancient versions have bigger problems than
needing to know exactly when a feature landed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: RiskyMH <git@riskymh.dev>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
2025-11-12 10:44:52 +11:00

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---
title: "Lifecycle scripts"
description: "How Bun handles package lifecycle scripts securely"
---
Packages on `npm` can define _lifecycle scripts_ in their `package.json`. Some of the most common are below, but there are [many others](https://docs.npmjs.com/cli/v10/using-npm/scripts).
- `preinstall`: Runs before the package is installed
- `postinstall`: Runs after the package is installed
- `preuninstall`: Runs before the package is uninstalled
- `prepublishOnly`: Runs before the package is published
These scripts are arbitrary shell commands that the package manager is expected to read and execute at the appropriate time. But executing arbitrary scripts represents a potential security risk, so—unlike other `npm` clients—Bun does not execute arbitrary lifecycle scripts by default.
---
## `postinstall`
The `postinstall` script is particularly important. It's widely used to build or install platform-specific binaries for packages that are implemented as [native Node.js add-ons](https://nodejs.org/api/addons.html). For example, `node-sass` is a popular package that uses `postinstall` to build a native binary for Sass.
```json package.json icon="file-json"
{
"name": "my-app",
"version": "1.0.0",
"dependencies": {
"node-sass": "^6.0.1"
}
}
```
---
## `trustedDependencies`
Instead of executing arbitrary scripts, Bun uses a "default-secure" approach. You can add certain packages to an allow list, and Bun will execute lifecycle scripts for those packages. To tell Bun to allow lifecycle scripts for a particular package, add the package name to `trustedDependencies` array in your `package.json`.
```json package.json icon="file-json"
{
"name": "my-app",
"version": "1.0.0",
"trustedDependencies": ["node-sass"] // [!code ++]
}
```
Once added to `trustedDependencies`, install/re-install the package. Bun will read this field and run lifecycle scripts for `my-trusted-package`.
The top 500 npm packages with lifecycle scripts are allowed by default. You can see the full list [here](https://github.com/oven-sh/bun/blob/main/src/install/default-trusted-dependencies.txt).
---
## `--ignore-scripts`
To disable lifecycle scripts for all packages, use the `--ignore-scripts` flag.
```bash terminal icon="terminal"
bun install --ignore-scripts
```