mdast utility to parse comment markers.
- What is this?
- When should I use this?
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This package is a utility that tries to parse a structured marker from a comment.
Comments are a hidden part of markdown, so they can be used as processing
instructions.
For example, this utility is used in remark-lint to control
whether lint rules are turned on or ignored, and by mdast-zone
to replace sections between two markers.
This package is ESM only. In Node.js (version 16+), install with npm:
npm install mdast-comment-markerIn Deno with esm.sh:
import {commentMarker} from 'https://esm.sh/mdast-comment-marker@3'In browsers with esm.sh:
<script type="module">
import {commentMarker} from 'https://esm.sh/mdast-comment-marker@3?bundle'
</script>import {commentMarker} from 'mdast-comment-marker'
console.log(commentMarker({type: 'html', value: '<!--foo-->'}));
console.log(commentMarker({
type: 'html',
value: '<!--foo bar baz=12.4 qux="test test" quux=\'false\'-->'
}));
console.log(commentMarker({type: 'html', value: '<!doctype html>'}));
// Also supports MDX expressions:
console.log(commentMarker({
type: 'mdxFlowExpression',
value: '/* lint disable heading-style */'
}));Yields:
{
name: 'foo',
attributes: '',
parameters: {},
node: { type: 'html', value: '<!--foo-->' }
}
{
name: 'foo',
attributes: `bar baz=12.4 qux="test test" quux='false'`,
parameters: { bar: true, baz: 12.4, qux: 'test test', quux: false },
node: {
type: 'html',
value: `<!--foo bar baz=12.4 qux="test test" quux='false'-->`
}
}
undefined
{
name: 'lint',
attributes: 'disable heading-style',
parameters: { disable: true, 'heading-style': true },
node: {
type: 'mdxFlowExpression',
value: '/* lint disable heading-style */'
}
}This package exports the identifier commentMarker.
There is no default export.
Parse a comment marker.
value(unknown) — thing to parse, typicallyNode
Info (Marker) when applicable or undefined.
Comment marker (TypeScript type).
name(string) — name of markerattributes(string) — value after nameparameters(MarkerParameters) — parsed attributesnode(Node) — reference to given node
Parameters (TypeScript type).
type MarkerParameters = Record<string, MarkerParameterValue>Value (TypeScript type).
If it looks like a number (to JavaScript), it’s cast as number.
The strings true and false are turned into their corresponding
booleans.
The empty string is also considered the true boolean.
type MarkerParameterValue = number | string | booleanThis package is fully typed with TypeScript.
This package exports the types Marker,
MarkerParameters, and
MarkerParameterValue
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, mdast-comment-marker@^3,
compatible with Node.js 16.
Use of mdast-comment-marker does not involve hast, user content, or change
the tree, so there are no openings for cross-site scripting (XSS)
attacks.
mdast-zone— change or replace a section marked by comments
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.
