Fix

.babelrc

@@ -0,0 +1,7 @@
+{
+  "env": {
+    "test": {
+      "plugins": ["istanbul"]
+    }
+  }
+}

cypress.config.ts

@@ -2,6 +2,8 @@
 import installCoverageTask from "@cypress/code-coverage/task";
 import { defineConfig } from "cypress";
 import { devServer } from "cypress-rspack-dev-server";
+import { version as reactVersion } from "react";
+import { merge } from "webpack-merge";
 
 export default defineConfig({
   viewportWidth: 1280,
@@ -25,12 +27,18 @@ export default defineConfig({
       return devServer({
         ...devServerConfig,
         framework: "react",
-        rspackConfig: {
-          ...require("./rspack.config").default,
+        rspackConfig: merge(require("./rspack.config").default, {
           experiments: {
             lazyCompilation: !devServerConfig.cypressConfig.isTextTerminal,
           },
-        },
+          resolve: {
+            alias: {
+              "cypress/react18": reactVersion.startsWith("18")
+                ? "cypress/react18"
+                : "cypress/react",
+            },
+          },
+        }),
       });
     },
     specPattern: "packages/**/src/**/*.cy.{js,ts,jsx,tsx}",

rspack.config.ts

@@ -15,6 +15,10 @@ export default defineConfig({
         test: /\.css$/,
         use: ["style-loader", "css-loader", "postcss-loader"],
       },
+      {
+        test: /packages\/.*\/src\/.*\.[tj]sx?$/,
+        use: ["babel-loader"],
+      },
       {
         test: /\.(j|t)s$/,
         exclude: [/[\\/]node_modules[\\/]/],

yarn.lock

@@ -5949,6 +5949,7 @@ __metadata:
     sass: "npm:^1.52.3"
     storybook: "npm:^8.2.4"
     stylelint: "npm:^16.0.0"
+    swc-plugin-coverage-instrument: "npm:^0.0.24"
     typescript: "npm:4.6.4"
     vite: "npm:^4.4.9"
     vite-plugin-istanbul: "npm:^6.0.0"
@@ -27582,6 +27583,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"swc-plugin-coverage-instrument@npm:^0.0.24":
+  version: 0.0.24
+  resolution: "swc-plugin-coverage-instrument@npm:0.0.24"
+  checksum: 10/7eeb04408430d79ee8ec7a628955e7680d62c89f49a002fa482e5bed73c0d01fa8d262303ff93a6e3efdae7667b1eaa984a4b07aa32b56f48d7e154a3645de97
+  languageName: node
+  linkType: hard
+
 "swr@npm:^2.1.2":
   version: 2.1.5
   resolution: "swr@npm:2.1.5"