Improve code quality and write tests

node_modules/@babel/plugin-proposal-unicode-property-regex/src/index.js

@@ -0,0 +1,32 @@
+import { declare } from "@babel/helper-plugin-utils";
+import rewritePattern from "regexpu-core";
+import * as regex from "@babel/helper-regex";
+
+export default declare((api, options) => {
+  api.assertVersion(7);
+
+  const { useUnicodeFlag = true } = options;
+  if (typeof useUnicodeFlag !== "boolean") {
+    throw new Error(".useUnicodeFlag must be a boolean, or undefined");
+  }
+
+  return {
+    name: "proposal-unicode-property-regex",
+
+    visitor: {
+      RegExpLiteral(path) {
+        const node = path.node;
+        if (!regex.is(node, "u")) {
+          return;
+        }
+        node.pattern = rewritePattern(node.pattern, node.flags, {
+          unicodePropertyEscape: true,
+          useUnicodeFlag,
+        });
+        if (!useUnicodeFlag) {
+          regex.pullFlag(node, "u");
+        }
+      },
+    },
+  };
+});