Improve code quality and write tests

node_modules/@babel/plugin-transform-dotall-regex/src/index.js

@@ -0,0 +1,25 @@
+import { declare } from "@babel/helper-plugin-utils";
+import rewritePattern from "regexpu-core";
+import * as regex from "@babel/helper-regex";
+
+export default declare(api => {
+  api.assertVersion(7);
+
+  return {
+    name: "transform-dotall-regex",
+
+    visitor: {
+      RegExpLiteral(path) {
+        const node = path.node;
+        if (!regex.is(node, "s")) {
+          return;
+        }
+        node.pattern = rewritePattern(node.pattern, node.flags, {
+          dotAllFlag: true,
+          useUnicodeFlag: regex.is(node, "u"),
+        });
+        regex.pullFlag(node, "s");
+      },
+    },
+  };
+});