unified plugin to infer some `meta` from Git

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unified plugin to infer file metadata from Git of a document.


*   [`unified().use(unifiedInferGitMeta, options?)`](#unifieduseunifiedinfergitmeta-options)

What is this?

This package is a unified
plugin to infer when content was first published, last modified, and who contributed to it, from Git.
unified is a project that transforms content with abstract syntax trees (ASTs). vfile is the virtual file interface used in unified. This is a unified plugin that extracts metadata from Git and exposes it on the vfile.

When should I use this?

This plugin is particularly useful in combination with rehype-metarehype-meta. When both are used together, output such as the following is generated:
<meta name="copyright" content="© 2019 Jane">
<meta name="author" content="Jane">
<!-- … -->
<meta property="article:published_time" content="2019-12-02T10:00:00.000Z">
<meta property="article:modified_time" content="2019-12-03T19:13:00.000Z">


This package is ESM onlyesm. In Node.js (version 12.20+, 14.14+, 16.0+, or 18.0+), install with npm:
npm install unified-infer-git-meta

In Deno with esm.shesmsh:
import unifiedInferGitMeta from 'https://esm.sh/unified-infer-git-meta@1'

In browsers with esm.shesmsh:
<script type="module">
  import unifiedInferGitMeta from 'https://esm.sh/unified-infer-git-meta@1?bundle'


Say our module example.js looks as follows:
import {read} from 'to-vfile'
import {unified} from 'unified'
import remarkParse from 'remark-parse'
import unifiedInferGitMeta from 'unified-infer-git-meta'
import remarkRehype from 'remark-rehype'
import rehypeDocument from 'rehype-document'
import rehypeMeta from 'rehype-meta'
import rehypeFormat from 'rehype-format'
import rehypeStringify from 'rehype-stringify'

const file = await unified()
  .use(rehypeMeta, {
    // Published and modified are only added if these two are also defined:
    og: true,
    type: 'article'
  .process(await read('readme.md'))


…now running node example.js yields:
  meta: {
    published: new Date('2021-09-09T11:12:34.000Z'),
    modified: new Date('2021-09-09T11:23:45.000Z'),
    author: 'Titus Wormer'

<!doctype html>
<html lang="en">
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="author" content="Titus Wormer">
    <meta property="og:type" content="article">
    <meta property="article:published_time" content="2021-09-09T11:12:34.000Z">
    <meta property="article:modified_time" content="2021-09-09T11:23:45.000Z">


This package exports no identifiers. The default export is unifiedInferGitMeta.

unified().use(unifiedInferGitMeta, options?)

Infer some metadata from a document tracked with Git. Infer some meta from Git.
This plugin sets file.data.meta.publishedmeta-published to the date a file was first committed, file.data.meta.modifiedmeta-modified to the date a file was last committed, and file.data.meta.authormeta-author to an abbreviated list of top authors of the file.
Configuration (optional).
Locale(s) to use to join authors and sort their names (string or Array<string>, default: 'en').
Maximum number of authors to include (number, default: 3). Set to -1 to not limit authors.
Text to use to label more authors when abbreviating (string, default: 'others').
Alternative format function to use ((authors: Array<string>) => string). Is given a list of abbreviated author names. If the list of authors had to be abbreviated, the last author is instead replaced by authorRest. Set limit: -1 to receive all author names.


This package is fully typed with TypeScript. The additional types Format and Options are exported.
It also registers the file.data.meta fields with vfile. If you’re working with the file, make sure to import this plugin somewhere in your types, as that registers the new fields on the file.
 * @typedef {import('unified-infer-git-meta')}

import {VFile} from 'vfile'

const file = new VFile()

console.log(file.data.meta.published) //=> TS now knows that this is a `Date?`.


Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, 16.0+, and 18.0+. Our projects sometimes work with older versions, but this is not guaranteed.


— add metadata to the head of a document
— infer file metadata from the title of a document
— infer file metadata from the description of a document
— infer file metadata from the reading time of a document


See contributing.mdcontributing in unifiedjs/.githubhealth for ways to get started. See support.mdsupport for ways to get help.
This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.


MITlicense © Titus Wormerauthor