planning

node_modules/micromark/lib/util/normalize-identifier.js

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+'use strict'
+
+var values = require('../character/values.js')
+
+function normalizeIdentifier(value) {
+  return (
+    value
+      // Collapse Markdown whitespace.
+      .replace(/[\t\n\r ]+/g, values.space)
+      // Trim.
+      .replace(/^ | $/g, '')
+      // Some characters are considered “uppercase”, but if their lowercase
+      // counterpart is uppercased will result in a different uppercase
+      // character.
+      // Hence, to get that form, we perform both lower- and uppercase.
+      // Upper case makes sure keys will not interact with default prototypal
+      // methods: no object method is uppercase.
+      .toLowerCase()
+      .toUpperCase()
+  )
+}
+
+module.exports = normalizeIdentifier