customHeadingId()

import { customHeadingId } from "@unifast/node";

Signature

function customHeadingId(): UnifastPlugin

Parameters

None.

Usage

import { compile, customHeadingId } from "@unifast/node";

const md = `# Introduction {#intro}`;

const result = compile(md, {
  plugins: [customHeadingId()],
});
// The heading gets id="intro" instead of the auto-generated slug

Examples

Custom ID

Use the {#custom-id} syntax at the end of a heading to assign a specific id attribute. The brace block is removed from the rendered text:

import { compile, customHeadingId } from "@unifast/node";

const md = `## Getting Started {#getting-started}`;

const result = compile(md, { plugins: [customHeadingId()] });
console.log(result.output);
// <h2 id="getting-started">Getting Started</h2>

Heading without custom ID

Headings without the {#...} syntax are left unchanged. They use the default slug generated from the heading text:

import { compile, customHeadingId } from "@unifast/node";

const md = `## Getting Started`;

const result = compile(md, { plugins: [customHeadingId()] });
console.log(result.output);
// <h2 id="getting-started">Getting Started</h2>

Classes and arbitrary attributes

The brace syntax also supports .class and key=value notation:

import { compile, customHeadingId } from "@unifast/node";

const md = `## API Reference {#api .docs data-level=2}`;

const result = compile(md, { plugins: [customHeadingId()] });
console.log(result.output);
// <h2 id="api" class="docs" data-level="2">API Reference</h2>