Rename Markdown util getHeaders() to getHeadings() (#4031)

* Renamed getHeaders() to getHeadings(), according to RFC #208.

* chore: update changeset

* fix: expose MarkdownHeading type from `astro`

Co-authored-by: Félix Sanz <me@felixsanz.com>
Co-authored-by: Nate Moore <nate@astro.build>

.changeset/young-radios-call.md

@@ -0,0 +1,6 @@
+---
+'astro': patch
+'@astrojs/markdown-remark': minor
+---
+
+**BREAKING** Renamed Markdown utility function `getHeaders()` to `getHeadings()`.

examples/docs/src/components/PageContent/PageContent.astro

@@ -4,14 +4,14 @@ import TableOfContents from "../RightSidebar/TableOfContents.tsx";
 
 const { content, githubEditUrl } = Astro.props;
 const title = content.title;
-const headers = content.astro.headers;
+const headings = content.astro.headings;
 ---
 
 <article id="article" class="content">
 	<section class="main-section">
 		<h1 class="content-title" id="overview">{title}</h1>
 		<nav class="block sm:hidden">
-			<TableOfContents client:media="(max-width: 50em)" {headers} />
+			<TableOfContents client:media="(max-width: 50em)" {headings} />
 		</nav>
 		<slot />
 	</section>

examples/docs/src/components/RightSidebar/MoreMenu.astro

@@ -8,7 +8,7 @@ const showMoreSection = CONFIG.COMMUNITY_INVITE_URL || editHref;
 {showMoreSection && <h2 class="heading">More</h2>}
 <ul>
 	{editHref && (
-		<li class={`header-link depth-2`}>
+		<li class={`heading-link depth-2`}>
 			<a class="edit-on-github" href={editHref} target="_blank">
 				<svg
 					aria-hidden="true"
@@ -32,7 +32,7 @@ const showMoreSection = CONFIG.COMMUNITY_INVITE_URL || editHref;
 		</li>
 	)}
 	{CONFIG.COMMUNITY_INVITE_URL && (
-		<li class={`header-link depth-2`}>
+		<li class={`heading-link depth-2`}>
 			<a href={CONFIG.COMMUNITY_INVITE_URL} target="_blank">
 				<svg
 					aria-hidden="true"

examples/docs/src/components/RightSidebar/RightSidebar.astro

@@ -2,12 +2,12 @@
 import TableOfContents from "./TableOfContents.tsx";
 import MoreMenu from "./MoreMenu.astro";
 const { content, githubEditUrl } = Astro.props;
-const headers = content.astro.headers;
+const headings = content.astro.headings;
 ---
 
 <nav class="sidebar-nav" aria-labelledby="grid-right">
 	<div class="sidebar-nav-inner">
-		<TableOfContents client:media="(min-width: 50em)" {headers} />
+		<TableOfContents client:media="(min-width: 50em)" {headings} />
 		<MoreMenu editHref={githubEditUrl} />
 	</div>
 </nav>

examples/docs/src/components/RightSidebar/TableOfContents.tsx

@@ -1,11 +1,11 @@
 import type { FunctionalComponent } from 'preact';
 import { h, Fragment } from 'preact';
 import { useState, useEffect, useRef } from 'preact/hooks';
+import { MarkdownHeading } from 'astro';
 
-const TableOfContents: FunctionalComponent<{ headers: any[] }> = ({ headers = [] }) => {
+const TableOfContents: FunctionalComponent<{ headings: MarkdownHeading[] }> = ({ headings = [] }) => {
 	const itemOffsets = useRef([]);
 	const [activeId, setActiveId] = useState<string>(undefined);
-
 	useEffect(() => {
 		const getItemOffsets = () => {
 			const titles = document.querySelectorAll('article :is(h1, h2, h3, h4)');
@@ -27,18 +27,18 @@ const TableOfContents: FunctionalComponent<{ headers: any[] }> = ({ headers = []
 		<>
 			<h2 class="heading">On this page</h2>
 			<ul>
-				<li class={`header-link depth-2 ${activeId === 'overview' ? 'active' : ''}`.trim()}>
+				<li class={`heading-link depth-2 ${activeId === 'overview' ? 'active' : ''}`.trim()}>
 					<a href="#overview">Overview</a>
 				</li>
-				{headers
+				{headings
 					.filter(({ depth }) => depth > 1 && depth < 4)
-					.map((header) => (
+					.map((heading) => (
 						<li
-							class={`header-link depth-${header.depth} ${
-								activeId === header.slug ? 'active' : ''
+							class={`heading-link depth-${heading.depth} ${
+								activeId === heading.slug ? 'active' : ''
 							}`.trim()}
 						>
-							<a href={`#${header.slug}`}>{header.text}</a>
+							<a href={`#${heading.slug}`}>{heading.text}</a>
 						</li>
 					))}
 			</ul>

examples/docs/src/styles/index.css

@@ -311,42 +311,42 @@ h2.heading {
 	margin-bottom: 0.5rem;
 }
 
-.header-link {
+.heading-link {
 	font-size: 1rem;
 	padding: 0.1rem 0 0.1rem 1rem;
 	border-left: 4px solid var(--theme-divider);
 }
 
-.header-link:hover,
-.header-link:focus {
+.heading-link:hover,
+.heading-link:focus {
 	border-left-color: var(--theme-accent);
 	color: var(--theme-accent);
 }
-.header-link:focus-within {
+.heading-link:focus-within {
 	color: var(--theme-text-light);
 	border-left-color: hsla(var(--color-gray-40), 1);
 }
-.header-link svg {
+.heading-link svg {
 	opacity: 0.6;
 }
-.header-link:hover svg {
+.heading-link:hover svg {
 	opacity: 0.8;
 }
-.header-link a {
+.heading-link a {
 	display: inline-flex;
 	gap: 0.5em;
 	width: 100%;
 	padding: 0.15em 0 0.15em 0;
 }
 
-.header-link.depth-3 {
+.heading-link.depth-3 {
 	padding-left: 2rem;
 }
-.header-link.depth-4 {
+.heading-link.depth-4 {
 	padding-left: 3rem;
 }
 
-.header-link a {
+.heading-link a {
 	font: inherit;
 	color: inherit;
 	text-decoration: none;

packages/astro/env.d.ts

@@ -18,7 +18,9 @@ declare module '*.md' {
 	export const frontmatter: MD['frontmatter'];
 	export const file: MD['file'];
 	export const url: MD['url'];
-	export const getHeaders: MD['getHeaders'];
+	export const getHeadings: MD['getHeadings'];
+	/** @deprecated Renamed to `getHeadings()` */
+	export const getHeaders: () => void;
 	export const Content: MD['Content'];
 	export const rawContent: MD['rawContent'];
 	export const compiledContent: MD['compiledContent'];

packages/astro/src/@types/astro.ts

@@ -1,5 +1,5 @@
 import type {
-	MarkdownHeader,
+	MarkdownHeading,
 	MarkdownMetadata,
 	MarkdownRenderingResult,
 	RehypePlugins,
@@ -16,6 +16,14 @@ import type { AstroConfigSchema } from '../core/config';
 import type { ViteConfigWithSSR } from '../core/create-vite';
 import type { AstroComponentFactory, Metadata } from '../runtime/server';
 export type { SSRManifest } from '../core/app/types';
+export type {
+	MarkdownHeading,
+	MarkdownMetadata,
+	MarkdownRenderingResult,
+	RehypePlugins,
+	RemarkPlugins,
+	ShikiConfig,
+} from '@astrojs/markdown-remark';
 
 export interface AstroBuiltinProps {
 	'client:load'?: boolean;
@@ -783,7 +791,9 @@ export interface MarkdownInstance<T extends Record<string, any>> {
 	rawContent(): string;
 	/** Markdown file compiled to valid Astro syntax. Queryable with most HTML parsing libraries */
 	compiledContent(): Promise<string>;
-	getHeaders(): Promise<MarkdownHeader[]>;
+	getHeadings(): Promise<MarkdownHeading[]>;
+	/** @deprecated Renamed to `getHeadings()` */
+	getHeaders(): void;
 	default: () => Promise<{
 		metadata: MarkdownMetadata;
 		frontmatter: MarkdownContent<T>;

packages/astro/src/vite-plugin-markdown/index.ts

@@ -123,8 +123,12 @@ export default function markdown({ config }: AstroPluginOptions): Plugin {
 							return load().then((m) => m.default(...args));
 						}
 						Content.isAstroComponentFactory = true;
+						export function getHeadings() {
+							return load().then((m) => m.metadata.headings);
+						}
 						export function getHeaders() {
-							return load().then((m) => m.metadata.headers);
+							console.warn('getHeaders() have been deprecated. Use getHeadings() function instead.');
+							return load().then((m) => m.metadata.headings);
 						};`,
 					map: null,
 				};

packages/markdown/remark/src/index.ts

@@ -1,7 +1,7 @@
 import type { MarkdownRenderingOptions, MarkdownRenderingResult } from './types';
 
 import { loadPlugins } from './load-plugins.js';
-import createCollectHeaders from './rehype-collect-headers.js';
+import createCollectHeadings from './rehype-collect-headings.js';
 import rehypeEscape from './rehype-escape.js';
 import rehypeExpressions from './rehype-expressions.js';
 import rehypeIslands from './rehype-islands.js';
@@ -41,7 +41,7 @@ export async function renderMarkdown(
 	} = opts;
 	const input = new VFile({ value: content, path: fileURL });
 	const scopedClassName = opts.$?.scopedClassName;
-	const { headers, rehypeCollectHeaders } = createCollectHeaders();
+	const { headings, rehypeCollectHeadings } = createCollectHeadings();
 
 	let parser = unified()
 		.use(markdown)
@@ -94,8 +94,8 @@ export async function renderMarkdown(
 	parser
 		.use(
 			isAstroFlavoredMd
-				? [rehypeJsx, rehypeExpressions, rehypeEscape, rehypeIslands, rehypeCollectHeaders]
-				: [rehypeCollectHeaders, rehypeRaw]
+				? [rehypeJsx, rehypeExpressions, rehypeEscape, rehypeIslands, rehypeCollectHeadings]
+				: [rehypeCollectHeadings, rehypeRaw]
 		)
 		.use(rehypeStringify, { allowDangerousHtml: true });
 
@@ -113,7 +113,7 @@ export async function renderMarkdown(
 	}
 
 	return {
-		metadata: { headers, source: content, html: result.toString() },
+		metadata: { headings, source: content, html: result.toString() },
 		code: result.toString(),
 	};
 }

packages/markdown/remark/src/rehype-collect-headings.ts

@@ -2,13 +2,13 @@ import Slugger from 'github-slugger';
 import { toHtml } from 'hast-util-to-html';
 import { visit } from 'unist-util-visit';
 
-import type { MarkdownHeader, RehypePlugin } from './types.js';
+import type { MarkdownHeading, RehypePlugin } from './types.js';
 
-export default function createCollectHeaders() {
-	const headers: MarkdownHeader[] = [];
+export default function createCollectHeadings() {
+	const headings: MarkdownHeading[] = [];
 	const slugger = new Slugger();
 
-	function rehypeCollectHeaders(): ReturnType<RehypePlugin> {
+	function rehypeCollectHeadings(): ReturnType<RehypePlugin> {
 		return function (tree) {
 			visit(tree, (node) => {
 				if (node.type !== 'element') return;
@@ -61,13 +61,13 @@ export default function createCollectHeaders() {
 					}
 				}
 
-				headers.push({ depth, slug: node.properties.id, text });
+				headings.push({ depth, slug: node.properties.id, text });
 			});
 		};
 	}
 
 	return {
-		headers,
-		rehypeCollectHeaders,
+		headings,
+		rehypeCollectHeadings,
 	};
 }

packages/markdown/remark/src/types.ts

@@ -44,14 +44,14 @@ export interface MarkdownRenderingOptions extends AstroMarkdownOptions {
 	isAstroFlavoredMd?: boolean;
 }
 
-export interface MarkdownHeader {
+export interface MarkdownHeading {
 	depth: number;
 	slug: string;
 	text: string;
 }
 
 export interface MarkdownMetadata {
-	headers: MarkdownHeader[];
+	headings: MarkdownHeading[];
 	source: string;
 	html: string;
 }