Refactor routing in App component to enhance navigation and improve error handling by integrating dynamic routes and updating the NotFound route.

node_modules/mdast-util-gfm-footnote/index.d.ts

@@ -0,0 +1,34 @@
+export {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from './lib/index.js'
+
+export interface ToMarkdownOptions {
+  // To do: next major: change default.
+  /**
+   * Use a blank line for the first line of footnote definitions
+   * (`boolean`, default: `false`).
+   */
+  firstLineBlank?: boolean | null | undefined
+}
+
+declare module 'mdast-util-to-markdown' {
+  interface ConstructNameMap {
+    /**
+     * Footnote definition.
+     *
+     * ```markdown
+     * > | [^a]: B.
+     *     ^^^^^^^^
+     * ```
+     */
+    footnoteDefinition: 'footnoteDefinition'
+
+    /**
+     * Footnote reference.
+     *
+     * ```markdown
+     * > | A[^b].
+     *      ^^^^
+     * ```
+     */
+    footnoteReference: 'footnoteReference'
+  }
+}

node_modules/mdast-util-gfm-footnote/index.js

@@ -0,0 +1,2 @@
+// Note: extra types exported from `index.d.ts`.
+export {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from './lib/index.js'

node_modules/mdast-util-gfm-footnote/lib/index.d.ts

@@ -0,0 +1,22 @@
+/**
+ * Create an extension for `mdast-util-from-markdown` to enable GFM footnotes
+ * in markdown.
+ *
+ * @returns {FromMarkdownExtension}
+ *   Extension for `mdast-util-from-markdown`.
+ */
+export function gfmFootnoteFromMarkdown(): FromMarkdownExtension;
+/**
+ * Create an extension for `mdast-util-to-markdown` to enable GFM footnotes
+ * in markdown.
+ *
+ * @param {ToMarkdownOptions | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {ToMarkdownExtension}
+ *   Extension for `mdast-util-to-markdown`.
+ */
+export function gfmFootnoteToMarkdown(options?: ToMarkdownOptions | null | undefined): ToMarkdownExtension;
+import type { Extension as FromMarkdownExtension } from 'mdast-util-from-markdown';
+import type { ToMarkdownOptions } from 'mdast-util-gfm-footnote';
+import type { Options as ToMarkdownExtension } from 'mdast-util-to-markdown';
+//# sourceMappingURL=index.d.ts.map

node_modules/mdast-util-gfm-footnote/lib/index.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["index.js"],"names":[],"mappings":"AA0HA;;;;;;GAMG;AACH,2CAHa,qBAAqB,CAkBjC;AAED;;;;;;;;GAQG;AACH,gDALW,iBAAiB,GAAG,IAAI,GAAG,SAAS,GAElC,mBAAmB,CAiD/B;wDApMS,0BAA0B;uCACA,yBAAyB;oDAKnD,wBAAwB"}

node_modules/mdast-util-gfm-footnote/lib/index.js

@@ -0,0 +1,212 @@
+/**
+ * @import {
+ *   CompileContext,
+ *   Extension as FromMarkdownExtension,
+ *   Handle as FromMarkdownHandle
+ * } from 'mdast-util-from-markdown'
+ * @import {ToMarkdownOptions} from 'mdast-util-gfm-footnote'
+ * @import {
+ *   Handle as ToMarkdownHandle,
+ *   Map,
+ *   Options as ToMarkdownExtension
+ * } from 'mdast-util-to-markdown'
+ * @import {FootnoteDefinition, FootnoteReference} from 'mdast'
+ */
+
+import {ok as assert} from 'devlop'
+import {normalizeIdentifier} from 'micromark-util-normalize-identifier'
+
+footnoteReference.peek = footnoteReferencePeek
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function enterFootnoteCallString() {
+  this.buffer()
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function enterFootnoteCall(token) {
+  this.enter({type: 'footnoteReference', identifier: '', label: ''}, token)
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function enterFootnoteDefinitionLabelString() {
+  this.buffer()
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function enterFootnoteDefinition(token) {
+  this.enter(
+    {type: 'footnoteDefinition', identifier: '', label: '', children: []},
+    token
+  )
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function exitFootnoteCallString(token) {
+  const label = this.resume()
+  const node = this.stack[this.stack.length - 1]
+  assert(node.type === 'footnoteReference')
+  node.identifier = normalizeIdentifier(
+    this.sliceSerialize(token)
+  ).toLowerCase()
+  node.label = label
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function exitFootnoteCall(token) {
+  this.exit(token)
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function exitFootnoteDefinitionLabelString(token) {
+  const label = this.resume()
+  const node = this.stack[this.stack.length - 1]
+  assert(node.type === 'footnoteDefinition')
+  node.identifier = normalizeIdentifier(
+    this.sliceSerialize(token)
+  ).toLowerCase()
+  node.label = label
+}
+
+/**
+ * @this {CompileContext}
+ * @type {FromMarkdownHandle}
+ */
+function exitFootnoteDefinition(token) {
+  this.exit(token)
+}
+
+/** @type {ToMarkdownHandle} */
+function footnoteReferencePeek() {
+  return '['
+}
+
+/**
+ * @type {ToMarkdownHandle}
+ * @param {FootnoteReference} node
+ */
+function footnoteReference(node, _, state, info) {
+  const tracker = state.createTracker(info)
+  let value = tracker.move('[^')
+  const exit = state.enter('footnoteReference')
+  const subexit = state.enter('reference')
+  value += tracker.move(
+    state.safe(state.associationId(node), {after: ']', before: value})
+  )
+  subexit()
+  exit()
+  value += tracker.move(']')
+  return value
+}
+
+/**
+ * Create an extension for `mdast-util-from-markdown` to enable GFM footnotes
+ * in markdown.
+ *
+ * @returns {FromMarkdownExtension}
+ *   Extension for `mdast-util-from-markdown`.
+ */
+export function gfmFootnoteFromMarkdown() {
+  return {
+    enter: {
+      gfmFootnoteCallString: enterFootnoteCallString,
+      gfmFootnoteCall: enterFootnoteCall,
+      gfmFootnoteDefinitionLabelString: enterFootnoteDefinitionLabelString,
+      gfmFootnoteDefinition: enterFootnoteDefinition
+    },
+    exit: {
+      gfmFootnoteCallString: exitFootnoteCallString,
+      gfmFootnoteCall: exitFootnoteCall,
+      gfmFootnoteDefinitionLabelString: exitFootnoteDefinitionLabelString,
+      gfmFootnoteDefinition: exitFootnoteDefinition
+    }
+  }
+}
+
+/**
+ * Create an extension for `mdast-util-to-markdown` to enable GFM footnotes
+ * in markdown.
+ *
+ * @param {ToMarkdownOptions | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {ToMarkdownExtension}
+ *   Extension for `mdast-util-to-markdown`.
+ */
+export function gfmFootnoteToMarkdown(options) {
+  // To do: next major: change default.
+  let firstLineBlank = false
+
+  if (options && options.firstLineBlank) {
+    firstLineBlank = true
+  }
+
+  return {
+    handlers: {footnoteDefinition, footnoteReference},
+    // This is on by default already.
+    unsafe: [{character: '[', inConstruct: ['label', 'phrasing', 'reference']}]
+  }
+
+  /**
+   * @type {ToMarkdownHandle}
+   * @param {FootnoteDefinition} node
+   */
+  function footnoteDefinition(node, _, state, info) {
+    const tracker = state.createTracker(info)
+    let value = tracker.move('[^')
+    const exit = state.enter('footnoteDefinition')
+    const subexit = state.enter('label')
+    value += tracker.move(
+      state.safe(state.associationId(node), {before: value, after: ']'})
+    )
+    subexit()
+
+    value += tracker.move(']:')
+
+    if (node.children && node.children.length > 0) {
+      tracker.shift(4)
+
+      value += tracker.move(
+        (firstLineBlank ? '\n' : ' ') +
+          state.indentLines(
+            state.containerFlow(node, tracker.current()),
+            firstLineBlank ? mapAll : mapExceptFirst
+          )
+      )
+    }
+
+    exit()
+
+    return value
+  }
+}
+
+/** @type {Map} */
+function mapExceptFirst(line, index, blank) {
+  return index === 0 ? line : mapAll(line, index, blank)
+}
+
+/** @type {Map} */
+function mapAll(line, index, blank) {
+  return (blank ? '' : '    ') + line
+}

node_modules/mdast-util-gfm-footnote/license

@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) Titus Wormer <tituswormer@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/mdast-util-gfm-footnote/package.json

@@ -0,0 +1,111 @@
+{
+  "author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
+  "bugs": "https://github.com/syntax-tree/mdast-util-gfm-footnote/issues",
+  "contributors": [
+    "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
+  ],
+  "dependencies": {
+    "@types/mdast": "^4.0.0",
+    "devlop": "^1.1.0",
+    "mdast-util-from-markdown": "^2.0.0",
+    "mdast-util-to-markdown": "^2.0.0",
+    "micromark-util-normalize-identifier": "^2.0.0"
+  },
+  "description": "mdast extension to parse and serialize GFM footnotes",
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "c8": "^10.0.0",
+    "micromark-extension-gfm-footnote": "^2.0.0",
+    "prettier": "^3.0.0",
+    "remark-cli": "^12.0.0",
+    "remark-preset-wooorm": "^11.0.0",
+    "type-coverage": "^2.0.0",
+    "typescript": "^5.0.0",
+    "xo": "^0.60.0"
+  },
+  "exports": "./index.js",
+  "files": [
+    "index.d.ts",
+    "index.js",
+    "lib/"
+  ],
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/unified"
+  },
+  "keywords": [
+    "footnote",
+    "gfm",
+    "markdown",
+    "markup",
+    "mdast-util",
+    "mdast",
+    "note",
+    "unist",
+    "utility",
+    "util"
+  ],
+  "license": "MIT",
+  "name": "mdast-util-gfm-footnote",
+  "prettier": {
+    "bracketSpacing": false,
+    "semi": false,
+    "singleQuote": true,
+    "tabWidth": 2,
+    "trailingComma": "none",
+    "useTabs": false
+  },
+  "remarkConfig": {
+    "plugins": [
+      "remark-preset-wooorm"
+    ]
+  },
+  "repository": "syntax-tree/mdast-util-gfm-footnote",
+  "scripts": {
+    "build": "tsc --build --clean && tsc --build && type-coverage",
+    "format": "remark --frail --output --quiet -- . && prettier --log-level warn --write -- . && xo --fix",
+    "test-api-dev": "node --conditions development test.js",
+    "test-api-prod": "node --conditions production test.js",
+    "test-api": "npm run test-api-dev && npm run test-api-prod",
+    "test-coverage": "c8 --100 --reporter lcov npm run test-api",
+    "test": "npm run build && npm run format && npm run test-coverage"
+  },
+  "sideEffects": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "strict": true
+  },
+  "type": "module",
+  "version": "2.1.0",
+  "xo": {
+    "overrides": [
+      {
+        "files": [
+          "**/*.d.ts"
+        ],
+        "rules": {
+          "@typescript-eslint/array-type": [
+            "error",
+            {
+              "default": "generic"
+            }
+          ],
+          "@typescript-eslint/ban-types": [
+            "error",
+            {
+              "extendDefaults": true
+            }
+          ],
+          "@typescript-eslint/consistent-type-definitions": [
+            "error",
+            "interface"
+          ]
+        }
+      }
+    ],
+    "prettier": true,
+    "rules": {
+      "unicorn/prefer-at": "off"
+    }
+  }
+}

node_modules/mdast-util-gfm-footnote/readme.md

@@ -0,0 +1,494 @@
+# mdast-util-gfm-footnote
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+[![Sponsors][sponsors-badge]][collective]
+[![Backers][backers-badge]][collective]
+[![Chat][chat-badge]][chat]
+
+[mdast][] extensions to parse and serialize [GFM][] footnotes.
+
+## Contents
+
+* [What is this?](#what-is-this)
+* [When to use this](#when-to-use-this)
+* [Install](#install)
+* [Use](#use)
+* [API](#api)
+  * [`gfmFootnoteFromMarkdown()`](#gfmfootnotefrommarkdown)
+  * [`gfmFootnoteToMarkdown(options?)`](#gfmfootnotetomarkdownoptions)
+  * [`ToMarkdownOptions`](#tomarkdownoptions)
+* [HTML](#html)
+* [Syntax](#syntax)
+* [Syntax tree](#syntax-tree)
+  * [Nodes](#nodes)
+  * [Content model](#content-model)
+* [Types](#types)
+* [Compatibility](#compatibility)
+* [Related](#related)
+* [Contribute](#contribute)
+* [License](#license)
+
+## What is this?
+
+This package contains two extensions that add support for GFM footnote syntax
+in markdown to [mdast][].
+These extensions plug into
+[`mdast-util-from-markdown`][mdast-util-from-markdown] (to support parsing
+footnotes in markdown into a syntax tree) and
+[`mdast-util-to-markdown`][mdast-util-to-markdown] (to support serializing
+footnotes in syntax trees to markdown).
+
+GFM footnotes were [announced September 30, 2021][post] but are not specified.
+Their implementation on github.com is currently buggy.
+The bugs have been reported on [`cmark-gfm`][cmark-gfm].
+
+## When to use this
+
+You can use these extensions when you are working with
+`mdast-util-from-markdown` and `mdast-util-to-markdown` already.
+
+When working with `mdast-util-from-markdown`, you must combine this package
+with [`micromark-extension-gfm-footnote`][micromark-extension-gfm-footnote].
+
+When you don’t need a syntax tree, you can use [`micromark`][micromark]
+directly with `micromark-extension-gfm-footnote`.
+
+When you are working with syntax trees and want all of GFM, use
+[`mdast-util-gfm`][mdast-util-gfm] instead.
+
+All these packages are used [`remark-gfm`][remark-gfm], which
+focusses on making it easier to transform content by abstracting these
+internals away.
+
+This utility does not handle how markdown is turned to HTML.
+That’s done by [`mdast-util-to-hast`][mdast-util-to-hast].
+If your content is not in English, you should configure that utility.
+
+## Install
+
+This package is [ESM only][esm].
+In Node.js (version 16+), install with [npm][]:
+
+```sh
+npm install mdast-util-gfm-footnote
+```
+
+In Deno with [`esm.sh`][esmsh]:
+
+```js
+import {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from 'https://esm.sh/mdast-util-gfm-footnote@2'
+```
+
+In browsers with [`esm.sh`][esmsh]:
+
+```html
+<script type="module">
+  import {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from 'https://esm.sh/mdast-util-gfm-footnote@2?bundle'
+</script>
+```
+
+## Use
+
+Say our document `example.md` contains:
+
+```markdown
+In the Solar System, Mercury[^mercury] and Venus[^venus] have very small tilts.
+
+[^mercury]:
+    **Mercury** is the first planet from the Sun and the smallest
+    in the Solar System.
+
+[^venus]:
+    **Venus** is the second planet from
+    the Sun.
+```
+
+…and our module `example.js` looks as follows:
+
+```js
+import fs from 'node:fs/promises'
+import {fromMarkdown} from 'mdast-util-from-markdown'
+import {
+  gfmFootnoteFromMarkdown,
+  gfmFootnoteToMarkdown
+} from 'mdast-util-gfm-footnote'
+import {toMarkdown} from 'mdast-util-to-markdown'
+import {gfmFootnote} from 'micromark-extension-gfm-footnote'
+
+const value = await fs.readFile('example.md', 'utf8')
+
+const tree = fromMarkdown(value, {
+  extensions: [gfmFootnote()],
+  mdastExtensions: [gfmFootnoteFromMarkdown()]
+})
+
+console.log(tree)
+
+const result = toMarkdown(tree, {
+  extensions: [gfmFootnoteToMarkdown({firstLineBlank: true})]
+})
+
+console.log(result)
+```
+
+…now running `node example.js` yields (positional info removed for brevity):
+
+```js
+{
+  type: 'root',
+  children: [
+    {
+      type: 'paragraph',
+      children: [
+        {type: 'text', value: 'In the Solar System, Mercury'},
+        {type: 'footnoteReference', identifier: 'mercury', label: 'mercury'},
+        {type: 'text', value: ' and Venus'},
+        {type: 'footnoteReference', identifier: 'venus', label: 'venus'},
+        {type: 'text', value: ' have very small tilts.'}
+      ]
+    },
+    {
+      type: 'footnoteDefinition',
+      identifier: 'mercury',
+      label: 'mercury',
+      children: [
+        {
+          type: 'paragraph',
+          children: [
+            {type: 'strong', children: [{type: 'text', value: 'Mercury'}]},
+            {
+              type: 'text',
+              value:
+                ' is the first planet from the Sun and the smallest\n' +
+                'in the Solar System.'
+            }
+          ]
+        }
+      ]
+    },
+    {
+      type: 'footnoteDefinition',
+      identifier: 'venus',
+      label: 'venus',
+      children: [
+        {
+          type: 'paragraph',
+          children: [
+            {type: 'strong', children: [{type: 'text', value: 'Venus'}]},
+            {type: 'text', value: ' is the second planet from\nthe Sun.'}
+          ]
+        }
+      ]
+    }
+  ]
+}
+```
+
+```markdown
+In the Solar System, Mercury[^mercury] and Venus[^venus] have very small tilts.
+
+[^mercury]:
+    **Mercury** is the first planet from the Sun and the smallest
+    in the Solar System.
+
+[^venus]:
+    **Venus** is the second planet from
+    the Sun.
+```
+
+## API
+
+This package exports the identifiers
+[`gfmFootnoteFromMarkdown`][api-gfmfootnotefrommarkdown] and
+[`gfmFootnoteToMarkdown`][api-gfmfootnotetomarkdown].
+There is no default export.
+It exports the type [`ToMarkdownOptions`][api-to-markdown-options].
+
+### `gfmFootnoteFromMarkdown()`
+
+Create an extension for
+[`mdast-util-from-markdown`][mdast-util-from-markdown]
+to enable GFM footnotes in markdown.
+
+###### Returns
+
+Extension for `mdast-util-from-markdown`
+([`FromMarkdownExtension`][frommarkdownextension]).
+
+### `gfmFootnoteToMarkdown(options?)`
+
+Create an extension for
+[`mdast-util-to-markdown`][mdast-util-to-markdown]
+to enable GFM footnotes in markdown.
+
+###### Parameters
+
+* `options` ([`ToMarkdownOptions`][api-to-markdown-options], optional)
+  — configuration
+
+###### Returns
+
+Extension for `mdast-util-to-markdown`
+([`ToMarkdownExtension`][tomarkdownextension]).
+
+### `ToMarkdownOptions`
+
+Configuration (TypeScript type).
+
+###### Fields
+
+* `firstLineBlank` (`boolean`, default: `false`)
+  — use a blank line for the first line of footnote definitions
+
+## HTML
+
+This utility does not handle how markdown is turned to HTML.
+That’s done by [`mdast-util-to-hast`][mdast-util-to-hast].
+If your content is not in English, you should configure that utility.
+
+## Syntax
+
+See [Syntax in `micromark-extension-gfm-footnote`][syntax].
+
+## Syntax tree
+
+The following interfaces are added to **[mdast][]** by this utility.
+
+### Nodes
+
+#### `FootnoteDefinition`
+
+```idl
+interface FootnoteDefinition <: Parent {
+  type: 'footnoteDefinition'
+  children: [FlowContent]
+}
+
+FootnoteDefinition includes Association
+```
+
+**FootnoteDefinition** (**[Parent][dfn-parent]**) represents content relating
+to the document that is outside its flow.
+
+**FootnoteDefinition** can be used where **[flow][dfn-flow-content]** content
+is expected.
+Its content model is also **[flow][dfn-flow-content]** content.
+
+**FootnoteDefinition** includes the mixin
+**[Association][dfn-mxn-association]**.
+
+**FootnoteDefinition** should be associated with
+**[FootnoteReferences][dfn-footnote-reference]**.
+
+For example, the following markdown:
+
+```markdown
+[^alpha]: bravo and charlie.
+```
+
+Yields:
+
+```js
+{
+  type: 'footnoteDefinition',
+  identifier: 'alpha',
+  label: 'alpha',
+  children: [{
+    type: 'paragraph',
+    children: [{type: 'text', value: 'bravo and charlie.'}]
+  }]
+}
+```
+
+#### `FootnoteReference`
+
+```idl
+interface FootnoteReference <: Node {
+  type: 'footnoteReference'
+}
+
+FootnoteReference includes Association
+```
+
+**FootnoteReference** (**[Node][dfn-node]**) represents a marker through
+association.
+
+**FootnoteReference** can be used where
+**[phrasing][dfn-phrasing-content]** content is expected.
+It has no content model.
+
+**FootnoteReference** includes the mixin **[Association][dfn-mxn-association]**.
+
+**FootnoteReference** should be associated with a
+**[FootnoteDefinition][dfn-footnote-definition]**.
+
+For example, the following markdown:
+
+```markdown
+[^alpha]
+```
+
+Yields:
+
+```js
+{
+  type: 'footnoteReference',
+  identifier: 'alpha',
+  label: 'alpha'
+}
+```
+
+### Content model
+
+#### `FlowContent` (GFM footnotes)
+
+```idl
+type FlowContentGfm = FootnoteDefinition | FlowContent
+```
+
+#### `PhrasingContent` (GFM footnotes)
+
+```idl
+type PhrasingContentGfm = FootnoteReference | PhrasingContent
+```
+
+## Types
+
+This package is fully typed with [TypeScript][].
+It does not export additional types.
+
+The `FootnoteDefinition` and `FootnoteReference` types of the mdast nodes are
+exposed from `@types/mdast`.
+
+## Compatibility
+
+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-util-gfm-footnote@^2`, compatible with Node.js 16.
+
+## Related
+
+* [`remark-gfm`][remark-gfm]
+  — remark plugin to support GFM
+* [`mdast-util-gfm`][mdast-util-gfm]
+  — same but all of GFM (autolink literals, footnotes, strikethrough, tables,
+  tasklists)
+* [`micromark-extension-gfm-footnote`][micromark-extension-gfm-footnote]
+  — micromark extension to parse GFM footnotes
+
+## Contribute
+
+See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for
+ways to get started.
+See [`support.md`][support] for ways to get help.
+
+This project has a [code of conduct][coc].
+By interacting with this repository, organization, or community you agree to
+abide by its terms.
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definitions -->
+
+[api-gfmfootnotefrommarkdown]: #gfmfootnotefrommarkdown
+
+[api-gfmfootnotetomarkdown]: #gfmfootnotetomarkdownoptions
+
+[api-to-markdown-options]: #tomarkdownoptions
+
+[author]: https://wooorm.com
+
+[backers-badge]: https://opencollective.com/unified/backers/badge.svg
+
+[build]: https://github.com/syntax-tree/mdast-util-gfm-footnote/actions
+
+[build-badge]: https://github.com/syntax-tree/mdast-util-gfm-footnote/workflows/main/badge.svg
+
+[chat]: https://github.com/syntax-tree/unist/discussions
+
+[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
+
+[cmark-gfm]: https://github.com/github/cmark-gfm
+
+[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
+
+[collective]: https://opencollective.com/unified
+
+[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
+
+[coverage]: https://codecov.io/github/syntax-tree/mdast-util-gfm-footnote
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/mdast-util-gfm-footnote.svg
+
+[dfn-flow-content]: #flowcontent-gfm-footnotes
+
+[dfn-footnote-definition]: #footnotedefinition
+
+[dfn-footnote-reference]: #footnotereference
+
+[dfn-mxn-association]: https://github.com/syntax-tree/mdast#association
+
+[dfn-node]: https://github.com/syntax-tree/unist#node
+
+[dfn-parent]: https://github.com/syntax-tree/mdast#parent
+
+[dfn-phrasing-content]: #phrasingcontent-gfm-footnotes
+
+[downloads]: https://www.npmjs.com/package/mdast-util-gfm-footnote
+
+[downloads-badge]: https://img.shields.io/npm/dm/mdast-util-gfm-footnote.svg
+
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
+[esmsh]: https://esm.sh
+
+[frommarkdownextension]: https://github.com/syntax-tree/mdast-util-from-markdown#extension
+
+[gfm]: https://github.github.com/gfm/
+
+[health]: https://github.com/syntax-tree/.github
+
+[license]: license
+
+[mdast]: https://github.com/syntax-tree/mdast
+
+[mdast-util-from-markdown]: https://github.com/syntax-tree/mdast-util-from-markdown
+
+[mdast-util-gfm]: https://github.com/syntax-tree/mdast-util-gfm
+
+[mdast-util-to-hast]: https://github.com/syntax-tree/mdast-util-to-hast
+
+[mdast-util-to-markdown]: https://github.com/syntax-tree/mdast-util-to-markdown
+
+[micromark]: https://github.com/micromark/micromark
+
+[micromark-extension-gfm-footnote]: https://github.com/micromark/micromark-extension-gfm-footnote
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[post]: https://github.blog/changelog/2021-09-30-footnotes-now-supported-in-markdown-fields/
+
+[remark-gfm]: https://github.com/remarkjs/remark-gfm
+
+[size]: https://bundlejs.com/?q=mdast-util-gfm-footnote
+
+[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=mdast-util-gfm-footnote
+
+[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
+
+[support]: https://github.com/syntax-tree/.github/blob/main/support.md
+
+[syntax]: https://github.com/micromark/micromark-extension-gfm-footnote#syntax
+
+[tomarkdownextension]: https://github.com/syntax-tree/mdast-util-to-markdown#options
+
+[typescript]: https://www.typescriptlang.org