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hast-util-to-text

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hast utility to get the plain-text value of a node.

Contents

What is this?

This package is a utility that takes a hast node and gets its plain-text value. It is like the DOMs Node#innerText, which is a bit nicer than Node#textContent, because this turns <br> elements into line breaks and uses '\t' (tabs) between table cells.

There are some small deviations from the spec, because the DOM has knowledge of associated CSS, and can take into account that elements have display: none or text-transform association with them, and this utility can’t do that.

When should I use this?

This is a small utility that is useful when you want a plain-text version of a node that is close to how it’s “visible” to users.

This utility is similar to hast-util-to-string, which is simpler, and more like the Node#textContent algorithm discussed above.

There is also a package hast-util-from-text, which sort of does the inverse: it takes a string, sets that as text on the node, while turning line endings into <br>s

Install

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

npm install hast-util-to-text

In Deno with esm.sh:

import {toText} from 'https://esm.sh/hast-util-to-text@4'

In browsers with esm.sh:

<script type="module">
  import {toText} from 'https://esm.sh/hast-util-to-text@4?bundle'
</script>

Use

import {h} from 'hastscript'
import {toText} from 'hast-util-to-text'

const tree = h('div', [
  h('h1', {hidden: true}, 'Alpha.'),
  h('article', [
    h('p', ['Bravo', h('br'), 'charlie.']),
    h('p', 'Delta echo \t foxtrot.')
  ])
])

console.log(toText(tree))

Yields:

Bravo
charlie.

Delta echo foxtrot.

API

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

toText(tree[, options])

Get the plain-text value of a node.

Parameters
Returns

Serialized tree (string).

Algorithm
Notes

👉 Note: the algorithm acts as if tree is being rendered, and as if we’re a CSS-supporting user agent, with scripting enabled.

Options

Configuration (TypeScript type).

Fields

Whitespace

Valid and useful whitespace values (from CSS) (TypeScript type).

Type
type Whitespace = 'normal' | 'nowrap' | 'pre' | 'pre-wrap'

Types

This package is fully typed with TypeScript. It exports the additional types Options and Whitespace.

Compatibility

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, hast-util-to-text@^4, compatible with Node.js 16.

Security

hast-util-to-text does not change the syntax tree so there are no openings for cross-site scripting (XSS) attacks.

Related

Contribute

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, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer

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