next-gitinfo

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Contents

• Motivation
• Installation
• Usage

- withGitInfo - useCurrentPageGitInfo

• How it works

There are lots of reasons to want to know when and why a page was changed. Perhaps your Next site serves a Wiki, updateable through Git. Maybe you want to create a /version page to keep track of what has been deployed in each environment. Maybe you use Markdown files for your blog articles, and want to show the last time that an article was updated.
No matter what your reason, having access to the Git information for a specific page in your Next.js page can be extremely valuable, though getting access to that info is a serious pain-in-the-butt.
This library provides Git information for every page in your Next app to be used however you see fit. It also provides hooks to easily access that information in each page.

npm install --save-dev next-gitinfo
# or
yarn add --dev next-gitinfo

withGitInfo

The withGitInfo library extends your Next config to include Git information in your builds. To use it, you must install it in your next.config.js file:

// Module imports
const withGitInfo = require('next-gitinfo')

module.exports = withGitInfo()

Alternatively, if you already have other Next configuration, you can pass it directly into withGitInfo:

// Module imports
const withGitInfo = require('next-gitinfo')

module.exports = withGitInfo({
	env: {},
	webpack: config => {
		return config
	},
})

Restarting your Next server will yield a new process.env.gitInfo variable that is available across your entire application.

// pages/version.js

export default VersionPage() {
	return (
		<pre>
			{JSON.stringify(process.env.gitInfo, null, 2)}
		</pre>
	)
}

useCurrentPageGitInfo

The useCurrentPageGitInfo hook allows you to retrieve the git info for the current page. This even works for dynamic pages.

// pages/index.js
import { useCurrentPageGitInfo } from 'next-gitinfo/hooks'

export default VersionPage() {
	const gitInfo = useCurrentPageGitInfo()
	return (
		<pre>
			{JSON.stringify(gitInfo, null, 2)}
		</pre>
	)
}

When starting your Next app, the withGitInfo library walks your pages/ directory. For each page file that it finds, it will get a raw Git commit and parse that commit into a readable object. That object is then injected into the app as process.env.gitInfo.
To get Git info for current page, the useCurrentPageGitInfo hook uses the Next.js router to determine the page currently being viewed, then pulls the data from process.env.gitInfo.pages for that page.
NOTE: withGitInfo only runs at compile time. This means that if you commit a file, process.env.gitInfo will not be updated until you restart the Next server.