test: improve failure message for the Babel plugin (#2269)

packages/babel-plugin-orbit-components/package.json

@@ -33,6 +33,6 @@
   "scripts": {
     "generateTestFile": "node scripts/generateImports.js",
     "build": "babel __fixtures__/index.js --out-file dist/index.js --root-mode upward",
-    "test": "yarn generateTestFile && yarn build && node dist/index.js"
+    "test": "yarn generateTestFile && yarn build && node scripts/testRequire.js"
   }
 }

packages/babel-plugin-orbit-components/scripts/testRequire.js

@@ -0,0 +1,19 @@
+// @noflow
+
+// to avoid an ESLint issue with --report-unused-disable-directives
+const path = "../dist";
+
+try {
+  // eslint-disable-next-line global-require, import/no-dynamic-require
+  require(path);
+} catch (err) {
+  const match = err.message.match(/Cannot find module '([^']*\/(\w+))'/);
+  if (match) {
+    console.error(
+      `\n@kiwicom/babel-plugin-orbit-components did not correctly transform the import path for the module "${match[2]}", "${match[1]}" doesn't exist. Make sure to configure it properly.\n`,
+    );
+  } else {
+    console.error(err);
+  }
+  process.exit(1);
+}