Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Test Suite Failed To Run - Unknown option: .preset

See original GitHub issue

Error Description: When running jest for a simple unit test of javascript code I get the error Test suite failed to run Unknown option: .preset

Below are the files to reproduce the error: package.json { "name": "RelocationTrackerApp", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "jest", "start-debug": "webpack-dev-server --open --config webpack.dev.js", "build-release": "webpack --config webpack.prod.js" }, "keywords": [], "author": "", "license": "ISC", "devDependencies": { "@babel/core": "^7.9.0", "@babel/preset-env": "^7.9.5", "@babel/preset-react": "^7.9.4", "@testing-library/react": "^10.0.3", "babel-jest": "^25.5.1", "babel-loader": "^8.1.0", "jest": "^25.5.0", "react-test-renderer": "^16.13.1", "webpack": "^4.42.1", "webpack-cli": "^3.3.11", "webpack-dev-server": "^3.10.3", "webpack-merge": "^4.2.2" }, "dependencies": { "react": "^16.13.1", "react-bootstrap": "^1.0.1", "react-dom": "^16.13.1", "react-router-dom": "^5.1.2" } }

.babelrc { "preset": ["@babel/preset-env", "@babel/preset-react"] }

sum.test.js ` const sum = require(‘./sum’);

test(‘properly ads two numbers’, () => { expect(sum(1, 2)).toBe(3) }) `

Below is the actual error: tests/sum.test.js ● Test suite failed to run

Unknown option: .preset. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.

  at throwUnknownError (node_modules/@babel/core/lib/config/validation/options.js:123:27)
  at node_modules/@babel/core/lib/config/validation/options.js:108:5
      at Array.forEach (<anonymous>)
  at validateNested (node_modules/@babel/core/lib/config/validation/options.js:84:21)
  at validate (node_modules/@babel/core/lib/config/validation/options.js:75:10)
  at node_modules/@babel/core/lib/config/config-chain.js:174:34
  at cachedFunction (node_modules/@babel/core/lib/config/caching.js:62:27)
      at cachedFunction.next (<anonymous>)
  at evaluateSync (node_modules/gensync/index.js:244:28)
  at sync (node_modules/gensync/index.js:84:14)