babel-7-jest

21.3.3 verified Sat Apr 25 auth: no javascript deprecated

Deprecated Jest transform plugin bridging babel-jest with @babel/core v7 before official support existed. Latest version 21.3.3, originally required @babel/core ^7.0.0-alpha/beta. Now superseded by babel-jest with babel-core@7.0.0-bridge.0. Do not use for new projects; official solution is stable and actively maintained.

Common errors

error Cannot find module '@babel/core' ↓

cause @babel/core not installed or peer dep not satisfied

fix

npm install --save-dev @babel/core@^7.0.0

error babel-7-jest is deprecated. Use babel-jest instead. ↓

cause Using deprecated package; npm warns on install

fix

Remove babel-7-jest and configure babel-jest as per official docs

Warnings

deprecated Package is deprecated; use official babel-jest with babel-core@7.0.0-bridge.0 instead. ↓

fix npm uninstall babel-7-jest && npm install --save-dev babel-jest @babel/core babel-core@7.0.0-bridge.0

breaking Requires exact @babel/core version matching peer dep (^7.0.0-alpha/beta). ↓

fix Use @babel/core ^7.0.0

gotcha Not compatible with Jest versions beyond 21.x due to API changes. ↓

fix Upgrade to official babel-jest for Jest 22+

Install

npm install babel-7-jest

yarn add babel-7-jest

pnpm add babel-7-jest

Imports

babel-7-jest
wrong
```
import babel7Jest from 'babel-7-jest'
```
correct
```
"babel-7-jest" (string in jest config)
```
Used as a transform string in Jest configuration, not imported in source code.

Quickstart

Demonstrates deprecated setup: configure Jest to use babel-7-jest transform for JavaScript files.

// package.json snippet (not runnable alone)
{
  "scripts": {
    "test": "jest"
  },
  "jest": {
    "transform": {
      ".js$": "babel-7-jest"
    }
  },
  "devDependencies": {
    "@babel/core": "^7.0.0",
    "babel-7-jest": "^21.3.3",
    "jest": "^21.0.0"
  }
}
// No JS code needed; config-based transform.