"Package validation is the process of verifying that your library is correctly structured, configured, and ready to be consumed by others before you publish it. It's not about checking whether your logic works. That's what tests are for. It's about making sure your package metadata, entry points, module formats, and published files all line up so that consumers can install and use it without unexpected runtime errors."
"You spin up a new Node.js project with npm init -y and start coding. To keep things simple, imagine your package exposes a small function that returns a custom greeting message: export const green = (name) => `Welcome, ${name ?? "stranger"}!`; That's pretty straightforward JavaScript using ESM modules. You follow the usual publishing steps and push the package to the npm registry or GitHub Packages. But the moment others install it and try to use it, things start breaking in ways you didn't see."
"Why did that happen? Figuring out what went wrong gets a lot harder once the package is large or has multiple build outputs. What looks fine locally can still fail for consumers, and even experienced developers can miss small packaging details that end up shipping a broken release."
Publishing and maintaining packages requires careful validation because small packaging oversights can break thousands of dependent projects. Package validation verifies that library metadata, entry points, module formats, and published files align so consumers can install and use the package without runtime errors. Tests cover logic but not packaging shape or distribution artifacts. Local development can hide issues that only appear after publishing, especially when packages produce multiple build outputs or use different module formats. Running pre-publish checks against package.json, built outputs, and registry publishing behavior reduces the risk of shipping broken releases.
Read at LogRocket Blog
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