README
rehype-infer-reading-time-meta
rehype plugin to infer the estimated reading time of a document.
Contents
- What is this?
- When should I use this?
- Install
- Use
- API
- Types
- Compatibility
- Security
- Related
- Contribute
- License
What is this?
This package is a unified (rehype) plugin to infer the estimated reading time of a document. The estimation takes readability, calibrated relative to the target audience, into account.
unified is a project that transforms content with abstract syntax trees (ASTs). rehype adds support for HTML to unified. vfile is the virtual file interface used in unified. hast is the HTML AST that rehype uses. This is a rehype plugin that inspects hast and adds metadata to vfiles.
When should I use this?
This plugin is particularly useful in combination with
rehype-meta
.
When both are used together and documents are shared, the estimated reading time
is shown on Slack or certain other services.
Install
This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:
npm install rehype-infer-reading-time-meta
In Deno with Skypack:
import rehypeInferReadingTimeMeta from 'https://cdn.skypack.dev/rehype-infer-reading-time-meta@1?dts'
In browsers with Skypack:
<script type="module">
import rehypeInferReadingTimeMeta from 'https://cdn.skypack.dev/rehype-infer-reading-time-meta@1?min'
</script>
Use
Say our module example.js
looks as follows:
import {unified} from 'unified'
import rehypeParse from 'rehype-parse'
import rehypeInferReadingTimeMeta from 'rehype-infer-reading-time-meta'
import rehypeDocument from 'rehype-document'
import rehypeMeta from 'rehype-meta'
import rehypeFormat from 'rehype-format'
import rehypeStringify from 'rehype-stringify'
main()
async function main() {
const file = await unified()
.use(rehypeParse, {fragment: true})
.use(rehypeInferReadingTimeMeta)
.use(rehypeDocument)
.use(rehypeMeta, {twitter: true})
.use(rehypeFormat)
.use(rehypeStringify)
.process(
'<h1>Build</h1><p><strong>We provide the building blocks</strong>: from tiny, focussed, modular utilities to plugins that combine them to perform bigger tasks. And much, much more. You can build on unified, mixing and matching building blocks together, to make all kinds of interesting new things.</p>'
)
console.log(String(file))
}
Now running node example.js
yields:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="twitter:card" content="summary">
<meta name="twitter:label1" content="Reading time">
<meta name="twitter:data1" content="1 minute">
</head>
<body>
<h1>Build</h1>
<p><strong>We provide the building blocks</strong>: from tiny, focussed, modular utilities to plugins that combine them to perform bigger tasks. And much, much more. You can build on unified, mixing and matching building blocks together, to make all kinds of interesting new things.</p>
</body>
</html>
API
This package exports no identifiers.
The default export is rehypeInferReadingTimeMeta
.
unified().use(rehypeInferReadingTimeMeta, options?)
Infer the estimated reading time from a document as file metadata.
The reading time is inferred not just on words per minute, but also takes
readability into account.
The result is stored on file.data.meta.readingTime
.
options
Configuration (optional).
options.age
Target age group (number
or [number, number]
, default: [16, 18]
).
This is the age your target audience was still in school.
Set it to 18 if you expect all readers to have finished high school, 21 if you
expect your readers to all be college graduates, etc.
Can be two numbers in an array to get two estimates.
options.mainSelector
CSS selector to body of content (string
, optional, example: 'main'
).
Useful to exclude other things, such as the head, ads, styles, scripts, and
other random stuff, by focussing on one element.
Types
This package is fully typed with TypeScript.
The extra type Options
is exported.
Compatibility
Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.
This plugin works with rehype-parse
version 3+, rehype-stringify
version 3+,
rehype
version 4+, and unified
version 6+.
Security
Use of rehype-infer-reading-time-meta
is safe.
Related
rehype-document
— wrap a fragment in a documentrehype-meta
— add metadata to the head of a documentunified-infer-git-meta
— infer file metadata from Gitrehype-infer-title-meta
— infer file metadata from the title of a documentrehype-infer-description-meta
— infer file metadata from the description of a document
Contribute
See contributing.md
in rehypejs/.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.