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@insanitybit/bun-prewarm

v0.0.1

Published

Prewarm Bun runtime state inside a Firecracker VM before snapshotting

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Maintainers

insanitybitinsanitybit

Keywords

Readme

bun-prewarm

Prewarm Bun runtime state inside a Firecracker VM before snapshotting.

Purpose

This package warms Bun-related filesystem, binary, and runtime state so that after snapshot restore, Bun startup and first-execution latency are lower.

Installation

npm install -g @insanitybit/bun-prewarm

Usage

Run explicitly during VM snapshot build:

bun-prewarm
# then snapshot the VM

What it does

  1. Runs bun --version to fault the Bun binary into memory
  2. Executes a small JS workload under Bun to warm parsing and runtime
  3. Runs bun install --no-save to warm package manager code paths

Requirements

  • Bun must be installed and available on $PATH
  • Linux environment (Firecracker VM)
  • Node.js 18+ (for running the prewarm script itself)