Move left pane entirely to React

ts/util/cleanSearchTerm.ts

@@ -0,0 +1,24 @@
+export function cleanSearchTerm(searchTerm: string) {
+  const lowercase = searchTerm.toLowerCase();
+  const withoutSpecialCharacters = lowercase.replace(
+    /([!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~])/g,
+    ' '
+  );
+  const whiteSpaceNormalized = withoutSpecialCharacters.replace(/\s+/g, ' ');
+  const byToken = whiteSpaceNormalized.split(' ');
+  const withoutSpecialTokens = byToken.filter(
+    token =>
+      token &&
+      token !== 'and' &&
+      token !== 'or' &&
+      token !== 'not' &&
+      token !== ')' &&
+      token !== '(' &&
+      token !== '+' &&
+      token !== ',' &&
+      token !== 'near'
+  );
+  const withWildcards = withoutSpecialTokens.map(token => `${token}*`);
+
+  return withWildcards.join(' ').trim();
+}