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frontend/node_modules/react-markdown/lib/uri-transformer.js

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+const protocols = ['http', 'https', 'mailto', 'tel']
+
+/**
+ * @param {string} uri
+ * @returns {string}
+ */
+export function uriTransformer(uri) {
+  const url = (uri || '').trim()
+  const first = url.charAt(0)
+
+  if (first === '#' || first === '/') {
+    return url
+  }
+
+  const colon = url.indexOf(':')
+  if (colon === -1) {
+    return url
+  }
+
+  let index = -1
+
+  while (++index < protocols.length) {
+    const protocol = protocols[index]
+
+    if (
+      colon === protocol.length &&
+      url.slice(0, protocol.length).toLowerCase() === protocol
+    ) {
+      return url
+    }
+  }
+
+  index = url.indexOf('?')
+  if (index !== -1 && colon > index) {
+    return url
+  }
+
+  index = url.indexOf('#')
+  if (index !== -1 && colon > index) {
+    return url
+  }
+
+  // eslint-disable-next-line no-script-url
+  return 'javascript:void(0)'
+}