JEST: Test faster by removing barrels (#1645)

test/jest/config/babelTransform.js

@@ -0,0 +1,16 @@
+const babelJest = require("babel-jest").default;
+
+module.exports = {
+  process(sourceText, sourcePath, options) {
+    const alias = options?.config?.moduleNameMapper;
+    const extensions = options.config.moduleFileExtensions;
+    const babelTransformer = babelJest.createTransformer({
+      presets: [["@babel/preset-react"], ["@babel/preset-env"], ["@babel/preset-typescript"]],
+      plugins: [["transform-barrels", { executorName: "jest", alias: alias, extensions: extensions }]],
+      babelrc: false,
+      configFile: false,
+    });
+
+    return babelTransformer.process(sourceText, sourcePath, options);
+  },
+};