Jest configuration setupFilesAfterEnv option was not found

Question

I'm trying to make Jest work again on a project developped 1 year ago and not maintained.

I have an error with path of setupFilesAfterEnvor transform.

• the error i get when i run "yarn test"

  $ jest __testsv2__ --config=./jest.config.js
  ● Validation Error:
  
  Module <rootDir>/jest/setup.js in the setupFilesAfterEnv option was not found.
         <rootDir> is: /Users/alain/dev/ddf/release
  
  Configuration Documentation:
  https://jestjs.io/docs/configuration.html
  
  error Command failed with exit code 1.
  

• my filesystem, in /Users/alain/dev/ddf/release/ i have

    babel.config.js
    jest.config.js
    /jest
      /setup
      setup.js ( so  full path is : /Users/alain/dev/ddf/release/jest/setup.js ) 
      staticFileAssetTransform.js ( so full path is : /Users/alain/dev/ddf/release/jest/staticFileAssetTransform.js )     
  

• My package.json

  { ...
   "scripts": {
        "test": "jest __testsv2__ --config=./jest.config.js"
        ...
    }
  }
  

• babel.config.js

  module.exports = function(api) {
     api.cache(false);
     const presets = ['@babel/preset-env', '@babel/preset-react'];    
     const plugins = [['@babel/proposal-object-rest-spread'],];
  
     return {
       presets,    plugins,   sourceMaps: "inline",
       ignore: [(process.env.NODE_ENV !== 'test' ?  "**/*.test.js" : null)    ].filter(n => n)
     };
   };
  

• jest.config.js

   module.exports = {
    resolver: 'browser-resolve',
    clearMocks: true,
    moduleNameMapper: {    '\\.(css|less|styl|md)$': 'identity-obj-proxy'    },
    // A list of paths to modules that run some code to configure or set up the testing framework before each test
    // setupFilesAfterEnv: ['./jest/setup.js'], // don't work too
    setupFilesAfterEnv: ['<rootDir>/jest/setup.js'], 
  
  
    // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
    testPathIgnorePatterns: ['/node_modules/', '/__gql_mocks__/'],
  
    // A map from regular expressions to paths to transformers
    transform: {
      '^.+\\.js$': './jest/babelRootModeUpwardTransform.js',
      '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': '<rootDir>/jest/staticFileAssetTransform.js',
    },
  };
  

Answer 1

For those coming here, make sure you prefix the path with <rootDir>

Like this:

setupFilesAfterEnv: ['<rootDir>/node_modules/@hirez_io/observer-spy/dist/setup-auto-unsubscribe.js']