1 | # rehype-stringify
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2 |
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3 | [![Build][build-badge]][build]
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4 | [![Coverage][coverage-badge]][coverage]
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5 | [![Downloads][downloads-badge]][downloads]
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6 | [![Size][size-badge]][size]
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7 | [![Sponsors][sponsors-badge]][collective]
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8 | [![Backers][backers-badge]][collective]
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9 | [![Chat][chat-badge]][chat]
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10 |
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11 | **[rehype][]** plugin to add support for serializing to HTML.
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12 |
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13 | ## Contents
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14 |
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15 | * [What is this?](#what-is-this)
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16 | * [When should I use this?](#when-should-i-use-this)
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17 | * [Install](#install)
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18 | * [Use](#use)
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19 | * [API](#api)
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20 | * [`unified().use(rehypeStringify[, options])`](#unifieduserehypestringify-options)
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21 | * [`CharacterReferences`](#characterreferences)
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22 | * [`Options`](#options)
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23 | * [Syntax](#syntax)
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24 | * [Syntax tree](#syntax-tree)
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25 | * [Types](#types)
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26 | * [Compatibility](#compatibility)
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27 | * [Security](#security)
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28 | * [Contribute](#contribute)
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29 | * [Sponsor](#sponsor)
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30 | * [License](#license)
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31 |
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32 | ## What is this?
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33 |
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34 | This package is a [unified][] ([rehype][]) plugin that defines how to take a
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35 | syntax tree as input and turn it into serialized HTML.
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36 | When it’s used, HTML is serialized as the final result.
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37 |
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38 | See [the monorepo readme][rehype] for info on what the rehype ecosystem is.
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39 |
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40 | ## When should I use this?
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41 |
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42 | This plugin adds support to unified for serializing HTML.
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43 | If you also need to parse HTML, you can alternatively use
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44 | [`rehype`][rehype-core], which combines unified,
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45 | [`rehype-parse`][rehype-parse], and this plugin.
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46 |
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47 | When you are in a browser, trust your content, don’t need formatting options,
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48 | and value a smaller bundle size, you can use
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49 | [`rehype-dom-stringify`][rehype-dom-stringify] instead.
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50 |
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51 | If you don’t use plugins and have access to a syntax tree, you can directly use
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52 | [`hast-util-to-html`][hast-util-to-html], which is used inside this plugin.
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53 | rehype focusses on making it easier to transform content by abstracting such
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54 | internals away.
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55 |
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56 | A different plugin, [`rehype-format`][rehype-format], improves the readability
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57 | of HTML source code as it adds insignificant but pretty whitespace between
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58 | elements.
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59 | There is also the preset [`rehype-minify`][rehype-minify] for when you want the
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60 | inverse: minified and mangled HTML.
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61 |
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62 | ## Install
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63 |
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64 | This package is [ESM only][esm].
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65 | In Node.js (version 16+), install with [npm][]:
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66 |
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67 | ```sh
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68 | npm install rehype-stringify
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69 | ```
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70 |
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71 | In Deno with [`esm.sh`][esmsh]:
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72 |
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73 | ```js
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74 | import rehypeStringify from 'https://esm.sh/rehype-stringify@10'
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75 | ```
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76 |
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77 | In browsers with [`esm.sh`][esmsh]:
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78 |
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79 | ```html
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80 | <script type="module">
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81 | import rehypeStringify from 'https://esm.sh/rehype-stringify@10?bundle'
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82 | </script>
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83 | ```
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84 |
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85 | ## Use
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86 |
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87 | Say we have the following module `example.js`:
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88 |
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89 | ```js
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90 | import remarkRehype from 'remark-rehype'
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91 | import rehypeStringify from 'rehype-stringify'
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92 | import remarkGfm from 'remark-gfm'
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93 | import remarkParse from 'remark-parse'
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94 | import {unified} from 'unified'
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95 |
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96 | const file = await unified()
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97 | .use(remarkParse)
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98 | .use(remarkGfm)
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99 | .use(remarkRehype)
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100 | .use(rehypeStringify)
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101 | .process('# Hi\n\n*Hello*, world!')
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102 |
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103 | console.log(String(file))
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104 | ```
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105 |
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106 | …running that with `node example.js` yields:
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107 |
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108 | ```html
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109 | <h1>Hi</h1>
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110 | <p><em>Hello</em>, world!</p>
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111 | ```
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112 |
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113 | ## API
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114 |
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115 | This package exports no identifiers.
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116 | The default export is [`rehypeStringify`][api-rehype-stringify].
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117 |
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118 | ### `unified().use(rehypeStringify[, options])`
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119 |
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120 | Plugin to add support for serializing to HTML.
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121 |
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122 | ###### Parameters
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123 |
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124 | * `options` ([`Options`][api-options], optional)
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125 | — configuration
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126 |
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127 | ###### Returns
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128 |
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129 | Nothing (`undefined`).
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130 |
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131 | ### `CharacterReferences`
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132 |
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133 | How to serialize character references (TypeScript type).
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134 |
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135 | > ⚠️ **Note**: `omitOptionalSemicolons` creates what HTML calls “parse errors”
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136 | > but is otherwise still valid HTML — don’t use this except when building a
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137 | > minifier.
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138 | > Omitting semicolons is possible for certain named and numeric references in
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139 | > some cases.
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140 |
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141 | > ⚠️ **Note**: `useNamedReferences` can be omitted when using
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142 | > `useShortestReferences`.
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143 |
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144 | ###### Fields
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145 |
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146 | * `useNamedReferences` (`boolean`, default: `false`)
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147 | — prefer named character references (`&`) where possible
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148 | * `omitOptionalSemicolons` (`boolean`, default: `false`)
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149 | — whether to omit semicolons when possible
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150 | * `useShortestReferences` (`boolean`, default: `false`)
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151 | — prefer the shortest possible reference, if that results in less bytes
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152 |
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153 | ### `Options`
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154 |
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155 | Configuration (TypeScript type).
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156 |
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157 | > ⚠️ **Danger**: only set `allowDangerousCharacters` and `allowDangerousHtml` if
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158 | > you completely trust the content.
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159 |
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160 | > 👉 **Note**: `allowParseErrors`, `bogusComments`, `tightAttributes`, and
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161 | > `tightDoctype`
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162 | > intentionally create parse errors in markup (how parse errors are handled is
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163 | > well defined, so this works but isn’t pretty).
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164 |
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165 | > 👉 **Note**: this is not an XML serializer.
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166 | > It supports SVG as embedded in HTML.
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167 | > It does not support the features available in XML.
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168 | > Use [`xast-util-to-xml`][xast-util-to-xml] to serialize XML.
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169 |
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170 | ###### Fields
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171 |
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172 | * `allowDangerousCharacters` (`boolean`, default: `false`)
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173 | — do not encode some characters which cause XSS vulnerabilities in older
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174 | browsers
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175 | * `allowDangerousHtml` (`boolean`, default: `false`)
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176 | — allow [`Raw`][raw] nodes and insert them as raw HTML; when `false`, `Raw`
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177 | nodes are encoded
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178 | * `allowParseErrors` (`boolean`, default: `false`)
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179 | — do not encode characters which cause parse errors (even though they
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180 | work), to save bytes; not used in the SVG space.
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181 | * `bogusComments` (`boolean`, default: `false`)
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182 | — use “bogus comments” instead of comments to save byes: `<?charlie>`
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183 | instead of `<!--charlie-->`
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184 | * `characterReferences` ([`CharacterReferences`][api-character-references],
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185 | optional)
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186 | — configure how to serialize character references
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187 | * `closeEmptyElements` (`boolean`, default: `false`)
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188 | — close SVG elements without any content with slash (`/`) on the opening
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189 | tag instead of an end tag: `<circle />` instead of `<circle></circle>`;
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190 | see `tightSelfClosing` to control whether a space is used before the slash;
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191 | not used in the HTML space
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192 | * `closeSelfClosing` (`boolean`, default: `false`)
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193 | — close self-closing nodes with an extra slash (`/`): `<img />` instead of
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194 | `<img>`; see `tightSelfClosing` to control whether a space is used before
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195 | the slash; not used in the SVG space.
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196 | * `collapseEmptyAttributes` (`boolean`, default: `false`)
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197 | — collapse empty attributes: get `class` instead of `class=""`; not used in
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198 | the SVG space; boolean attributes (such as `hidden`) are always collapsed
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199 | * `omitOptionalTags` (`boolean`, default: `false`)
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200 | — omit optional opening and closing tags; to illustrate, in
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201 | `<ol><li>one</li><li>two</li></ol>`, both `</li>` closing tags can be
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202 | omitted, the first because it’s followed by another `li`, the last because
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203 | it’s followed by nothing; not used in the SVG space
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204 | * `preferUnquoted` (`boolean`, default: `false`)
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205 | — leave attributes unquoted if that results in less bytes; not used in the
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206 | SVG space
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207 | * `quote` (`'"'` or `"'"`, default: `'"'`)
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208 | — preferred quote to use
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209 | * `quoteSmart` (`boolean`, default: `false`)
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210 | — use the other quote if that results in less bytes
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211 | * `space` (`'html'` or `'svg'`, default: `'html'`)
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212 | — which space the document is in; when an `<svg>` element is found in the
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213 | HTML space, this package already automatically switches to and from the SVG
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214 | * `tightAttributes` (`boolean`, default: `false`)
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215 | — join attributes together, without whitespace, if possible: get
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216 | `class="a b"title="c d"` instead of `class="a b" title="c d"` to save
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217 | bytes; not used in the SVG space
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218 | * `tightCommaSeparatedLists` (`boolean`, default: `false`)
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219 | — join known comma-separated attribute values with just a comma (`,`),
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220 | instead of padding them on the right as well (`,␠`, where `␠` represents a
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221 | space)
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222 | * `tightDoctype` (`boolean`, default: `false`)
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223 | — drop unneeded spaces in doctypes: `<!doctypehtml>` instead of
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224 | `<!doctype html>` to save bytes
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225 | * `tightSelfClosing` (`boolean`, default: `false`).
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226 | — do not use an extra space when closing self-closing elements: `<img/>`
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227 | instead of `<img />`; only used if `closeSelfClosing: true` or
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228 | `closeEmptyElements: true`
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229 | * `upperDoctype` (`boolean`, default: `false`).
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230 | — use a `<!DOCTYPE…` instead of `<!doctype…`; useless except for XHTML
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231 | * `voids` (`Array<string>`, default:
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232 | [`html-void-elements`][html-void-elements])
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233 | — tag names of elements to serialize without closing tag; not used in the
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234 | SVG space
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235 |
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236 | ## Syntax
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237 |
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238 | HTML is serialized according to WHATWG HTML (the living standard), which is also
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239 | followed by all browsers.
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240 |
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241 | ## Syntax tree
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242 |
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243 | The syntax tree format used in rehype is [hast][].
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244 |
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245 | ## Types
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246 |
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247 | This package is fully typed with [TypeScript][].
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248 | It exports the additional types
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249 | [`CharacterReferences`][api-character-references] and
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250 | [`Options`][api-options].
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251 |
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252 | ## Compatibility
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253 |
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254 | Projects maintained by the unified collective are compatible with maintained
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255 | versions of Node.js.
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256 |
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257 | When we cut a new major release, we drop support for unmaintained versions of
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258 | Node.
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259 | This means we try to keep the current release line, `rehype-stringify@^10`,
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260 | compatible with Node.js 16.
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261 |
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262 | ## Security
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263 |
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264 | As **rehype** works on HTML, and improper use of HTML can open you up to a
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265 | [cross-site scripting (XSS)][xss] attack, use of rehype can also be unsafe.
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266 | Use [`rehype-sanitize`][rehype-sanitize] to make the tree safe.
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267 |
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268 | Use of rehype plugins could also open you up to other attacks.
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269 | Carefully assess each plugin and the risks involved in using them.
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270 |
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271 | For info on how to submit a report, see our [security policy][security].
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272 |
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273 | ## Contribute
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274 |
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275 | See [`contributing.md`][contributing] in [`rehypejs/.github`][health] for ways
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276 | to get started.
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277 | See [`support.md`][support] for ways to get help.
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278 |
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279 | This project has a [code of conduct][coc].
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280 | By interacting with this repository, organization, or community you agree to
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281 | abide by its terms.
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282 |
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283 | ## Sponsor
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284 |
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285 | Support this effort and give back by sponsoring on [OpenCollective][collective]!
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286 |
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287 | <table>
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288 | <tr valign="middle">
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289 | <td width="20%" align="center" rowspan="2" colspan="2">
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290 | <a href="https://vercel.com">Vercel</a><br><br>
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291 | <a href="https://vercel.com"><img src="https://avatars1.githubusercontent.com/u/14985020?s=256&v=4" width="128"></a>
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292 | </td>
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293 | <td width="20%" align="center" rowspan="2" colspan="2">
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294 | <a href="https://motif.land">Motif</a><br><br>
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295 | <a href="https://motif.land"><img src="https://avatars1.githubusercontent.com/u/74457950?s=256&v=4" width="128"></a>
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296 | </td>
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297 | <td width="20%" align="center" rowspan="2" colspan="2">
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298 | <a href="https://www.hashicorp.com">HashiCorp</a><br><br>
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299 | <a href="https://www.hashicorp.com"><img src="https://avatars1.githubusercontent.com/u/761456?s=256&v=4" width="128"></a>
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300 | </td>
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301 | <td width="20%" align="center" rowspan="2" colspan="2">
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302 | <a href="https://www.gitbook.com">GitBook</a><br><br>
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303 | <a href="https://www.gitbook.com"><img src="https://avatars1.githubusercontent.com/u/7111340?s=256&v=4" width="128"></a>
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304 | </td>
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305 | <td width="20%" align="center" rowspan="2" colspan="2">
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306 | <a href="https://www.gatsbyjs.org">Gatsby</a><br><br>
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307 | <a href="https://www.gatsbyjs.org"><img src="https://avatars1.githubusercontent.com/u/12551863?s=256&v=4" width="128"></a>
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308 | </td>
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309 | </tr>
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310 | <tr valign="middle">
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311 | </tr>
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312 | <tr valign="middle">
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313 | <td width="20%" align="center" rowspan="2" colspan="2">
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314 | <a href="https://www.netlify.com">Netlify</a><br><br>
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315 |
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316 | <a href="https://www.netlify.com"><img src="https://images.opencollective.com/netlify/4087de2/logo/256.png" width="128"></a>
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317 | </td>
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318 | <td width="10%" align="center">
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319 | <a href="https://www.coinbase.com">Coinbase</a><br><br>
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320 | <a href="https://www.coinbase.com"><img src="https://avatars1.githubusercontent.com/u/1885080?s=256&v=4" width="64"></a>
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321 | </td>
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322 | <td width="10%" align="center">
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323 | <a href="https://themeisle.com">ThemeIsle</a><br><br>
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324 | <a href="https://themeisle.com"><img src="https://avatars1.githubusercontent.com/u/58979018?s=128&v=4" width="64"></a>
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325 | </td>
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326 | <td width="10%" align="center">
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327 | <a href="https://expo.io">Expo</a><br><br>
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328 | <a href="https://expo.io"><img src="https://avatars1.githubusercontent.com/u/12504344?s=128&v=4" width="64"></a>
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329 | </td>
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330 | <td width="10%" align="center">
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331 | <a href="https://boostnote.io">Boost Note</a><br><br>
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332 | <a href="https://boostnote.io"><img src="https://images.opencollective.com/boosthub/6318083/logo/128.png" width="64"></a>
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333 | </td>
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334 | <td width="10%" align="center">
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335 | <a href="https://markdown.space">Markdown Space</a><br><br>
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336 | <a href="https://markdown.space"><img src="https://images.opencollective.com/markdown-space/e1038ed/logo/128.png" width="64"></a>
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337 | </td>
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338 | <td width="10%" align="center">
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339 | <a href="https://www.holloway.com">Holloway</a><br><br>
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340 | <a href="https://www.holloway.com"><img src="https://avatars1.githubusercontent.com/u/35904294?s=128&v=4" width="64"></a>
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341 | </td>
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342 | <td width="10%"></td>
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343 | <td width="10%"></td>
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344 | </tr>
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345 | <tr valign="middle">
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346 | <td width="100%" align="center" colspan="8">
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347 | <br>
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348 | <a href="https://opencollective.com/unified"><strong>You?</strong></a>
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349 | <br><br>
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350 | </td>
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351 | </tr>
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352 | </table>
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353 |
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354 | ## License
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355 |
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356 | [MIT][license] © [Titus Wormer][author]
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357 |
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358 |
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359 |
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360 | [build-badge]: https://github.com/rehypejs/rehype/workflows/main/badge.svg
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361 |
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362 | [build]: https://github.com/rehypejs/rehype/actions
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363 |
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364 | [coverage-badge]: https://img.shields.io/codecov/c/github/rehypejs/rehype.svg
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365 |
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366 | [coverage]: https://codecov.io/github/rehypejs/rehype
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367 |
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368 | [downloads-badge]: https://img.shields.io/npm/dm/rehype-stringify.svg
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369 |
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370 | [downloads]: https://www.npmjs.com/package/rehype-stringify
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371 |
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372 | [size-badge]: https://img.shields.io/bundlejs/size/rehype-stringify
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373 |
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374 | [size]: https://bundlejs.com/?q=rehype-stringify
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375 |
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376 | [sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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377 |
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378 | [backers-badge]: https://opencollective.com/unified/backers/badge.svg
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379 |
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380 | [collective]: https://opencollective.com/unified
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381 |
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382 | [chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
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383 |
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384 | [chat]: https://github.com/rehypejs/rehype/discussions
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385 |
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386 | [health]: https://github.com/rehypejs/.github
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387 |
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388 | [security]: https://github.com/rehypejs/.github/blob/main/security.md
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389 |
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390 | [contributing]: https://github.com/rehypejs/.github/blob/main/contributing.md
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391 |
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392 | [support]: https://github.com/rehypejs/.github/blob/main/support.md
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393 |
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394 | [coc]: https://github.com/rehypejs/.github/blob/main/code-of-conduct.md
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395 |
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396 | [license]: https://github.com/rehypejs/rehype/blob/main/license
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397 |
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398 | [author]: https://wooorm.com
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399 |
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400 | [esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
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401 |
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402 | [npm]: https://docs.npmjs.com/cli/install
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403 |
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404 | [esmsh]: https://esm.sh
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405 |
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406 | [unified]: https://github.com/unifiedjs/unified
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407 |
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408 | [rehype]: https://github.com/rehypejs/rehype
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409 |
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410 | [hast]: https://github.com/syntax-tree/hast
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411 |
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412 | [xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
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413 |
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414 | [typescript]: https://www.typescriptlang.org
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415 |
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416 | [rehype-parse]: ../rehype-parse/
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417 |
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418 | [rehype-core]: ../rehype/
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419 |
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420 | [rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize
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421 |
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422 | [rehype-format]: https://github.com/rehypejs/rehype-format
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423 |
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424 | [rehype-minify]: https://github.com/rehypejs/rehype-minify
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425 |
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426 | [rehype-dom-stringify]: https://github.com/rehypejs/rehype-dom/tree/main/packages/rehype-dom-stringify
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427 |
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428 | [hast-util-to-html]: https://github.com/syntax-tree/hast-util-to-html
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429 |
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430 | [xast-util-to-xml]: https://github.com/syntax-tree/xast-util-to-xml
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431 |
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432 | [html-void-elements]: https://github.com/wooorm/html-void-elements
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433 |
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434 |
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435 |
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436 | [raw]: https://github.com/syntax-tree/mdast-util-to-hast?tab=readme-ov-file#raw
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437 |
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438 | [api-character-references]: #characterreferences
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439 |
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440 | [api-options]: #options
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441 |
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442 | [api-rehype-stringify]: #unifieduserehypestringify-options
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