rehype-remove-duplicate-attribute-values

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[rehype][] plugin to remove duplicates in attributes values.

Contents

* What is this?
* When should I use this?
* Install
* Use
* API
* unified().use(rehypeRemoveDuplicateAttributeValues)
* Example
* Syntax
* Syntax tree
* Types
* Compatibility
* Security
* Contribute
* License

What is this?

This package is a plugin that removes duplicates amongst attribute values of
unique tokens (such as class).

When should I use this?

You can use this plugin when you want to improve the transfer size of HTML
documents.

Install

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

``sh
npm install rehype-remove-duplicate-attribute-values
`

In Deno with [esm.sh][esm-sh]:

`js
import rehypeRemoveDuplicateAttributeValues from 'https://esm.sh/rehype-remove-duplicate-attribute-values@4'
`

In browsers with [esm.sh][esm-sh]:

`html

`

Use

On the API:

`js
import rehypeParse from 'rehype-parse'
import rehypeRemoveDuplicateAttributeValues from 'rehype-remove-duplicate-attribute-values'
import rehypeStringify from 'rehype-stringify'
import {read} from 'to-vfile'
import {unified} from 'unified'

const file = await unified()
.use(rehypeParse)
.use(rehypeRemoveDuplicateAttributeValues)
.use(rehypeStringify)
.process(await read('index.html'))

console.log(String(file))
`

On the CLI:

`sh
rehype input.html --use rehype-remove-duplicate-attribute-values --output output.html
`

On the CLI in a config file (here a package.json):

`diff
…
"rehype": {
"plugins": [
…
+ "rehype-remove-duplicate-attribute-values",
…
]
}
…
`

API

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

$3

Remove duplicates in attributes values.

###### Returns

Transform (Transformer).

Example

###### In

`html



`

###### Out

`html



`

Syntax

HTML is parsed according to WHATWG HTML (the living standard), which is also
followed by all browsers.

Syntax tree

The syntax tree used is [hast][].

Types

This package is fully typed with [TypeScript][].

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,
rehype-remove-duplicate-attribute-values@^4,
compatible with Node.js 16.

Security

As rehype works on HTML and improper use of HTML can open you up to a
[cross-site scripting (XSS)][xss] attack, use of rehype can also be unsafe.
Use [rehype-sanitize][rehype-sanitize] to make the tree safe.

Contribute

See [contributing.md][contributing] in [rehypejs/.github][health] for ways
to get started.
See [support.md`][support] for ways to get help.

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

License

[MIT][license] © [Titus Wormer][author]

[author]: https://wooorm.com

[build]: https://github.com/rehypejs/rehype-minify/actions

[build-badge]: https://github.com/rehypejs/rehype-minify/workflows/main/badge.svg

[chat]: https://github.com/rehypejs/rehype/discussions

[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg

[coc]: https://github.com/rehypejs/.github/blob/main/code-of-conduct.md

[contributing]: https://github.com/rehypejs/.github/blob/main/contributing.md

[coverage]: https://codecov.io/github/rehypejs/rehype-minify

[coverage-badge]: https://img.shields.io/codecov/c/github/rehypejs/rehype-minify.svg

[downloads]: https://www.npmjs.com/package/rehype-remove-duplicate-attribute-values

[downloads-badge]: https://img.shields.io/npm/dm/rehype-remove-duplicate-attribute-values.svg

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[esm-sh]: https://esm.sh

[funding]: https://opencollective.com/unified

[funding-backers-badge]: https://opencollective.com/unified/backers/badge.svg

[funding-sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg

[hast]: https://github.com/syntax-tree/hast

[health]: https://github.com/rehypejs/.github

[license]: https://github.com/rehypejs/rehype-minify/blob/main/license

[npm]: https://docs.npmjs.com/cli/install

[rehype]: https://github.com/rehypejs/rehype

[rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize

[size]: https://bundlejs.com/?q=rehype-remove-duplicate-attribute-values

[size-badge]: https://img.shields.io/bundlejs/size/rehype-remove-duplicate-attribute-values

[support]: https://github.com/rehypejs/.github/blob/main/support.md

[typescript]: https://www.typescriptlang.org

[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting