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

node_modules/micromark-extension-gfm-footnote/dev/lib/html.js

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+/**
+ * @import {HtmlOptions as Options} from 'micromark-extension-gfm-footnote'
+ * @import {HtmlExtension} from 'micromark-util-types'
+ */
+
+import {ok as assert} from 'devlop'
+import {normalizeIdentifier} from 'micromark-util-normalize-identifier'
+import {sanitizeUri} from 'micromark-util-sanitize-uri'
+
+const own = {}.hasOwnProperty
+
+/** @type {Options} */
+const emptyOptions = {}
+
+/**
+ * Generate the default label that GitHub uses on backreferences.
+ *
+ * @param {number} referenceIndex
+ *   Index of the definition in the order that they are first referenced,
+ *   0-indexed.
+ * @param {number} rereferenceIndex
+ *   Index of calls to the same definition, 0-indexed.
+ * @returns {string}
+ *   Default label.
+ */
+export function defaultBackLabel(referenceIndex, rereferenceIndex) {
+  return (
+    'Back to reference ' +
+    (referenceIndex + 1) +
+    (rereferenceIndex > 1 ? '-' + rereferenceIndex : '')
+  )
+}
+
+/**
+ * Create an extension for `micromark` to support GFM footnotes when
+ * serializing to HTML.
+ *
+ * @param {Options | null | undefined} [options={}]
+ *   Configuration (optional).
+ * @returns {HtmlExtension}
+ *   Extension for `micromark` that can be passed in `htmlExtensions` to
+ *   support GFM footnotes when serializing to HTML.
+ */
+export function gfmFootnoteHtml(options) {
+  const config = options || emptyOptions
+  const label = config.label || 'Footnotes'
+  const labelTagName = config.labelTagName || 'h2'
+  const labelAttributes =
+    config.labelAttributes === null || config.labelAttributes === undefined
+      ? 'class="sr-only"'
+      : config.labelAttributes
+  const backLabel = config.backLabel || defaultBackLabel
+  const clobberPrefix =
+    config.clobberPrefix === null || config.clobberPrefix === undefined
+      ? 'user-content-'
+      : config.clobberPrefix
+  return {
+    enter: {
+      gfmFootnoteDefinition() {
+        const stack = this.getData('tightStack')
+        stack.push(false)
+      },
+      gfmFootnoteDefinitionLabelString() {
+        this.buffer()
+      },
+      gfmFootnoteCallString() {
+        this.buffer()
+      }
+    },
+    exit: {
+      gfmFootnoteDefinition() {
+        let definitions = this.getData('gfmFootnoteDefinitions')
+        const footnoteStack = this.getData('gfmFootnoteDefinitionStack')
+        assert(footnoteStack, 'expected `footnoteStack`')
+        const tightStack = this.getData('tightStack')
+        const current = footnoteStack.pop()
+        const value = this.resume()
+
+        assert(current, 'expected to be in a footnote')
+
+        if (!definitions) {
+          this.setData('gfmFootnoteDefinitions', (definitions = {}))
+        }
+
+        if (!own.call(definitions, current)) definitions[current] = value
+
+        tightStack.pop()
+        this.setData('slurpOneLineEnding', true)
+        // “Hack” to prevent a line ending from showing up if we’re in a definition in
+        // an empty list item.
+        this.setData('lastWasTag')
+      },
+      gfmFootnoteDefinitionLabelString(token) {
+        let footnoteStack = this.getData('gfmFootnoteDefinitionStack')
+
+        if (!footnoteStack) {
+          this.setData('gfmFootnoteDefinitionStack', (footnoteStack = []))
+        }
+
+        footnoteStack.push(normalizeIdentifier(this.sliceSerialize(token)))
+        this.resume() // Drop the label.
+        this.buffer() // Get ready for a value.
+      },
+      gfmFootnoteCallString(token) {
+        let calls = this.getData('gfmFootnoteCallOrder')
+        let counts = this.getData('gfmFootnoteCallCounts')
+        const id = normalizeIdentifier(this.sliceSerialize(token))
+        /** @type {number} */
+        let counter
+
+        this.resume()
+
+        if (!calls) this.setData('gfmFootnoteCallOrder', (calls = []))
+        if (!counts) this.setData('gfmFootnoteCallCounts', (counts = {}))
+
+        const index = calls.indexOf(id)
+        const safeId = sanitizeUri(id.toLowerCase())
+
+        if (index === -1) {
+          calls.push(id)
+          counts[id] = 1
+          counter = calls.length
+        } else {
+          counts[id]++
+          counter = index + 1
+        }
+
+        const reuseCounter = counts[id]
+
+        this.tag(
+          '<sup><a href="#' +
+            clobberPrefix +
+            'fn-' +
+            safeId +
+            '" id="' +
+            clobberPrefix +
+            'fnref-' +
+            safeId +
+            (reuseCounter > 1 ? '-' + reuseCounter : '') +
+            '" data-footnote-ref="" aria-describedby="footnote-label">' +
+            String(counter) +
+            '</a></sup>'
+        )
+      },
+      null() {
+        const calls = this.getData('gfmFootnoteCallOrder') || []
+        const counts = this.getData('gfmFootnoteCallCounts') || {}
+        const definitions = this.getData('gfmFootnoteDefinitions') || {}
+        let index = -1
+
+        if (calls.length > 0) {
+          this.lineEndingIfNeeded()
+          this.tag(
+            '<section data-footnotes="" class="footnotes"><' +
+              labelTagName +
+              ' id="footnote-label"' +
+              (labelAttributes ? ' ' + labelAttributes : '') +
+              '>'
+          )
+          this.raw(this.encode(label))
+          this.tag('</' + labelTagName + '>')
+          this.lineEndingIfNeeded()
+          this.tag('<ol>')
+        }
+
+        while (++index < calls.length) {
+          // Called definitions are always defined.
+          const id = calls[index]
+          const safeId = sanitizeUri(id.toLowerCase())
+          let referenceIndex = 0
+          /** @type {Array<string>} */
+          const references = []
+
+          while (++referenceIndex <= counts[id]) {
+            references.push(
+              '<a href="#' +
+                clobberPrefix +
+                'fnref-' +
+                safeId +
+                (referenceIndex > 1 ? '-' + referenceIndex : '') +
+                '" data-footnote-backref="" aria-label="' +
+                this.encode(
+                  typeof backLabel === 'string'
+                    ? backLabel
+                    : backLabel(index, referenceIndex)
+                ) +
+                '" class="data-footnote-backref">↩' +
+                (referenceIndex > 1
+                  ? '<sup>' + referenceIndex + '</sup>'
+                  : '') +
+                '</a>'
+            )
+          }
+
+          const reference = references.join(' ')
+          let injected = false
+
+          this.lineEndingIfNeeded()
+          this.tag('<li id="' + clobberPrefix + 'fn-' + safeId + '">')
+          this.lineEndingIfNeeded()
+          this.tag(
+            definitions[id].replace(/<\/p>(?:\r?\n|\r)?$/, function ($0) {
+              injected = true
+              return ' ' + reference + $0
+            })
+          )
+
+          if (!injected) {
+            this.lineEndingIfNeeded()
+            this.tag(reference)
+          }
+
+          this.lineEndingIfNeeded()
+          this.tag('</li>')
+        }
+
+        if (calls.length > 0) {
+          this.lineEndingIfNeeded()
+          this.tag('</ol>')
+          this.lineEndingIfNeeded()
+          this.tag('</section>')
+        }
+      }
+    }
+  }
+}