babel-jest plugin & babel 7 incompatibility

Do you want to request a feature or report a bug? Bug

What is the current behavior? babel-7-jest does work for me. babel-jest does not work for me.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

What is the expected behavior? When I run test suite using babel-7-jest:

When I run test suite using babel-jest:

 TypeError: Cannot read property 'loose' of undefined (While processing preset: "/Users/alechp/Code/servexyz/repospace/cli/node_modules/@babel/preset-env/lib/index.js")

All that is required to make these tests pass is toggle the “transform” option in Jest config from “babel-jest” to “babel-7-jest” (note: I have both installed right now for easy swapping, but I have tried executing babel-jest after having removed babel-7-jest from dependencies and clearing cache)

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

Relevant dependencies, jest configuration and babel configuration

"devDependencies": {
    "@babel/core": "^7.0.0-beta.39",
    "@babel/node": "^7.0.0-beta.39",
    "@babel/preset-env": "^7.0.0-beta.39",
    "babel-7-jest": "^21.3.3",
    "babel-jest": "^22.2.2",
    "jest": "^22.2.2"
  },
  "jest": {
    "verbose": true,
    "bail": false,
    "collectCoverage": false,
    "modulePathIgnorePatterns": ["sandbox", "node_modules"],
    "transform": {
      "^.+\\.jsx?$": "babel-jest"
    }
  },
  "babel": {
    "presets": [
      [
        "@babel/preset-env",
        {
          "targets": {
            "node": "9.3.0"
          }
        }
      ]
    ]
  }

[thymikee]

See the docs on using Jest with Babel 7: https://facebook.github.io/jest/docs/en/getting-started.html#using-babel

[wmertens]

So I installed babel-core@bridge and I still get babel-core from jest-config and jest-runtime:

$ npm ls babel-core
proj@0.0.1 /path/proj
├── babel-core@7.0.0-bridge.0
└─┬ jest-cli@23.4.1
  ├─┬ jest-config@23.4.1
  │ └─┬ babel-core@6.26.3
  │   └─┬ babel-register@6.26.0
  │     └── babel-core@6.26.3
  └─┬ jest-runtime@23.4.1
    └── babel-core@6.26.3

maybe -config and -runtime should declare babel-core as a peerDependency?