PR #17599 broke `yarn test-build-devtools`. (b6c423daadaa35da3f34048628df9635505eecb1 is not broken,  0cf22a56a18790ef34c71bef14f64695c0498619 is broken)
```
    Configuration error:
    
    Could not locate module shared/consoleWithStackDev mapped as:
    /Users/bvaughn/Documents/git/react/build/node_modules/shared/consoleWithStackDev.
    
    Please check your configuration for these entries:
    {
      "moduleNameMapper": {
        "/^shared\/([^\/]+)$/": "/Users/bvaughn/Documents/git/react/build/node_modules/shared/$1"
      },
      "resolver": null
    }
```
module.exports = Object.assign({}, baseConfig, {
  
  moduleNameMapper,
  
  testPathIgnorePatterns: ['/node_modules/', '-test.internal.js$'],
  
  transformIgnorePatterns: ['/node_modules/', '<rootDir>/build/'],
  testRegex: 'packages/react-devtools-shared/src/__tests__/[^]+.test.js$',
  snapshotSerializers: [
    require.resolve(
      '../../packages/react-devtools-shared/src/__tests__/inspectedElementSerializer.js'
    ),
    require.resolve(
      '../../packages/react-devtools-shared/src/__tests__/storeSerializer.js'
    ),
  ],
  setupFiles: [
    ...baseConfig.setupFiles,
    require.resolve('./setupTests.build.js'),
    require.resolve(
      '../../packages/react-devtools-shared/src/__tests__/setupEnv.js'
    ),
  ],
  setupFilesAfterEnv: [
    require.resolve(
      '../../packages/react-devtools-shared/src/__tests__/setupTests.js'
    ),
  ],
});