fix: add regenerate-unicode-properties to dynamicRequireTargets

Gulpfile.mjs

@@ -237,6 +237,19 @@ function buildBabel(exclude) {
     .pipe(gulp.dest(base));
 }
 
+/**
+ * Resolve a nested dependency starting from the given file
+ */
+function resolveChain(baseUrl, ...packages) {
+  const require = createRequire(baseUrl);
+
+  return packages.reduce(
+    (base, pkg) =>
+      require.resolve(pkg + "/package.json", { paths: [path.dirname(base)] }),
+    fileURLToPath(baseUrl)
+  );
+}
+
 // If this build is part of a pull request, include the pull request number in
 // the version number.
 let versionSuffix = "";
@@ -292,6 +305,15 @@ function buildRollup(packages, targetBrowsers) {
               "packages/babel-compat-data/*.js",
               "packages/*/src/**/*.cjs",
             ],
+            dynamicRequireTargets: [
+              // https://github.com/mathiasbynens/regexpu-core/blob/ffd8fff2e31f4597f6fdfee75d5ac1c5c8111ec3/rewrite-pattern.js#L48
+              resolveChain(
+                import.meta.url,
+                "./packages/babel-helper-create-regexp-features-plugin",
+                "regexpu-core",
+                "regenerate-unicode-properties"
+              ) + "/../**",
+            ],
           }),
           rollupBabel({
             envName: babelEnvName,

packages/babel-standalone/test/babel.js

@@ -217,6 +217,13 @@
           }),
         ).not.toThrow();
       });
+      it("#12815 - unicode property letter short alias should be transformed", () => {
+        expect(() =>
+          Babel.transform("/\\p{L}/u", {
+            plugins: ["proposal-unicode-property-regex"],
+          }),
+        ).not.toThrow();
+      });
     });
   },
 );