Project: syntax-tree/unist-util-source

Package: unist-util-source@4.0.1

  1. Dependents: 0
  2. unist utility to get the source of a value
  1. util 145
  2. utility 141
  3. unist 132
  4. unist-util 25
  5. node 24
  6. position 9
  7. source 3


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unist utility to get the source code of a node or position.


What is this?

This is a tiny utility that lets you get the source code of a node or position.

When should I use this?

This is super tiny utility useful when you want to display the source code of something in a file.


This package is ESM only. In Node.js (version 16+), install with npm:

npm install unist-util-source

In Deno with esm.sh:

import {source} from 'https://esm.sh/unist-util-source@5'

In browsers with esm.sh:

<script type="module">
  import {source} from 'https://esm.sh/unist-util-source@5?bundle'


Say our document example.md contains:

> + **[Hello](./example)**
>   world.

…and our module example.js looks as follows:

import {fromMarkdown} from 'mdast-util-from-markdown'
import {read} from 'to-vfile'
import {source} from 'unist-util-source'

const file = await read('example.md')
const tree = fromMarkdown(String(file))

const strong = tree.children[0].children[0].children[0].children[0].children[0]
console.log(source(file, strong))

…now running node example.js yields:



This package exports the identifier source. There is no default export.

source(file[, value])

Get the source of a node or at a position.


Source of value in doc, if available (string or undefined).


This package is fully typed with TypeScript. It exports no additional types.


Projects maintained by the unified collective are compatible with maintained versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line, unist-util-source@^5, compatible with Node.js 16.


See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organisation, or community you agree to abide by its terms.


MIT © Titus Wormer