hast-util-to-html
hast utility to serialize to HTML.
Install
This package is ESM only:
Node 12+ is needed to use it and it must be imported instead of required.
npm:
npm install hast-util-to-htmlUse
import {h} from 'hastscript'
import {toHtml} from 'hast-util-to-html'
var tree = h('.alpha', [
'bravo ',
h('b', 'charlie'),
' delta ',
h('a.echo', {download: true}, 'foxtrot')
])
console.log(toHtml(tree))Yields:
<div class="alpha">bravo <b>charlie</b> delta <a class="echo" download>foxtrot</a></div>API
This package exports the following identifiers: toHtml.
There is no default export.
toHtml(tree[, options])
Serialize the given hast tree (or list of nodes).
options.space
Whether the root of the tree is in the 'html' or 'svg'
space (enum, 'svg' or 'html', default: 'html').
If an svg element is found in the HTML space, toHtml automatically switches
to the SVG space when entering the element, and switches back when exiting.
options.entities
Configuration for stringify-entities (Object, default:
{}).
Do not use escapeOnly, attribute, or subset (toHtml already passes
those, so they won’t work).
However, useNamedReferences, useShortestReferences, and
omitOptionalSemicolons are all fine.
options.voids
Tag names of elements to serialize without closing tag
(Array.<string>, default: html-void-elements).
Not used in the SVG space.
options.upperDoctype
Use a <!DOCTYPE… instead of <!doctype….
Useless except for XHTML (boolean, default: false).
options.quote
Preferred quote to use ('"' or '\'', default: '"').
options.quoteSmart
Use the other quote if that results in less bytes (boolean, default: false).
options.preferUnquoted
Leave attributes unquoted if that results in less bytes (boolean, default:
false).
Not used in the SVG space.
options.omitOptionalTags
Omit optional opening and closing tags (boolean, default: false).
For example, in <ol><li>one</li><li>two</li></ol>, both </li>
closing tags can be omitted.
The first because it’s followed by another li, the last because it’s followed
by nothing.
Not used in the SVG space.
options.collapseEmptyAttributes
Collapse empty attributes: get class instead of class="" (boolean,
default: false).
Note: boolean attributes, such as hidden, are always collapsed.
Not used in the SVG space.
options.closeSelfClosing
Close self-closing nodes with an extra slash (/): <img /> instead of
<img> (boolean, default: false).
See tightSelfClosing to control whether a space is used before the slash.
Not used in the SVG space.
options.closeEmptyElements
Close SVG elements without any content with slash (/) on the opening tag
instead of an end tag: <circle /> instead of <circle></circle> (boolean,
default: false).
See tightSelfClosing to control whether a space is used before the slash.
Not used in the HTML space.
options.tightSelfClosing
Do not use an extra space when closing self-closing elements: <img/> instead
of <img /> (boolean, default: false).
Note: Only used if closeSelfClosing: true or closeEmptyElements: true.
options.tightCommaSeparatedLists
Join known comma-separated attribute values with just a comma (,), instead of
padding them on the right as well (,·, where · represents a space)
(boolean, default: false).
options.tightAttributes
Join attributes together, without whitespace, if possible: get
class="a b"title="c d" instead of class="a b" title="c d" to save bytes
(boolean, default: false).
Note: creates invalid (but working) markup.
Not used in the SVG space.
options.tightDoctype
Drop unneeded spaces in doctypes: <!doctypehtml> instead of <!doctype html>
to save bytes (boolean, default: false).
Note: creates invalid (but working) markup.
options.bogusComments
Use “bogus comments” instead of comments to save byes: <?charlie> instead of
<!--charlie--> (boolean, default: false).
Note: creates invalid (but working) markup.
options.allowParseErrors
Do not encode characters which cause parse errors (even though they work), to
save bytes (boolean, default: false).
Note: creates invalid (but working) markup.
Not used in the SVG space.
options.allowDangerousCharacters
Do not encode some characters which cause XSS vulnerabilities in older browsers
(boolean, default: false).
Note: Only set this if you completely trust the content.
options.allowDangerousHtml
Allow raw nodes and insert them as raw HTML.
When falsey, encodes raw nodes (boolean, default: false).
Note: Only set this if you completely trust the content.
Security
Use of hast-util-to-html can open you up to a
cross-site scripting (XSS) attack if the hast tree is unsafe.
Use hast-util-santize to make the hast tree safe.
Related
hast-util-sanitize— Sanitize hast nodesrehype-stringify— Wrapper around this project for rehype
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.