Project: syntax-tree/unist-util-find-before

Package: unist-util-find-before@3.0.0

  1. Dependents: 0
  2. unist utility to find a node before another node
  1. util 147
  2. utility 143
  3. unist 131
  4. unist-util 25
  5. node 23
  6. find 11
  7. before 2


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unist utility to find a node before another node.


What is this?

This is a tiny utility that you can use to find a node before another node or before an index in a parent.

When should I use this?

This is super tiny. You can of course do it yourself. But this helps when integrating with the rest of unified and unist.


This package is ESM only. In Node.js (version 14.14+ and 16.0+), install with npm:

npm install unist-util-find-before

In Deno with esm.sh:

import {findBefore} from 'https://esm.sh/unist-util-find-before@3'

In browsers with esm.sh:

<script type="module">
  import {findBefore} from 'https://esm.sh/unist-util-find-before@3?bundle'


import {u} from 'unist-builder'
import {findBefore} from 'unist-util-find-before'

const tree = u('tree', [
  u('leaf', 'leaf 1'),
  u('parent', [u('leaf', 'leaf 2'), u('leaf', 'leaf 3')]),
  u('leaf', 'leaf 4'),
  u('parent', [u('leaf', 'leaf 5')]),
  u('leaf', 'leaf 6'),
  u('leaf', 'leaf 7')

const empty = tree.children[5]

console.log(findBefore(tree, empty, 'parent'))


{type: 'parent', children: [{type: 'leaf', value: 'leaf 5'}]}


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

findBefore(parent, node|index[, test])

Find the first node in parent before another node or before an index, that passes test.


Child of parent (Node) or null.


This package is fully typed with TypeScript. It exports no additional types (types for the test are in unist-util-is).


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


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