🤖 config(babel): Setup test environment.

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  - https://github.com/aureooms/rejuvenate/blob/1fe650dc2407c6c6395828a28777fe8137a3bd2f/src/transforms/babel:setup-env-test.js
Please contact the author of the transform if you believe there was an error.

package.json

@@ -129,6 +129,12 @@
       "test": {
         "sourceMaps": "inline",
         "presets": [
+          [
+            "@babel/preset-env",
+            {
+              "targets": "current node"
+            }
+          ],
           "babel-preset-power-assert"
         ],
         "plugins": [