Support Babel 8 in plugins and presets

[nicolo-ribaudo]

Summary

The only remaining blocker for the Babel 8 stable release is to make sure that it works for major Babel consumers. This PR is the first step towards making Jest ready for it. It updates babel-plugin-jest-hoist, babel-preset-jest and babel-jest to support running with Babel 8 in addition to supporting Babel 7.

Test plan

Tests updated to run both with Babel 7 and Babel 8.

Unfortunately, while the Babel plugins/presets maintained in this repo work reasonably well with Babel 8, Babel 8 itself cannot be loaded inside Jest-run tests, because it's written in ESM. Or maybe it's possible, but not the way that Jest is configured in this repo.

As a workaround, I'm loading the Babel 8 ESM packages using Node.js' native require, rather than Jest's sandboxed version.

Most of the diff in tests is indentation changes. I suggest disabling whitespace diff when reviewing.

(fyi @JLHwung @liuxingbaoyu)

[netlify]

✅ Deploy Preview for jestjs ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	1813d34
🔍 Latest deploy log	https://app.netlify.com/projects/jestjs/deploys/688b84ebfa9bfa0008d79e32
😎 Deploy Preview	https://deploy-preview-15750--jestjs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[pkg-pr-new]

Open in StackBlitz

babel-jest

npm i https://pkg.pr.new/babel-jest@15750

babel-plugin-jest-hoist

npm i https://pkg.pr.new/babel-plugin-jest-hoist@15750

babel-preset-jest

npm i https://pkg.pr.new/babel-preset-jest@15750

create-jest

npm i https://pkg.pr.new/create-jest@15750

@jest/diff-sequences

npm i https://pkg.pr.new/@jest/diff-sequences@15750

expect

npm i https://pkg.pr.new/expect@15750

@jest/expect-utils

npm i https://pkg.pr.new/@jest/expect-utils@15750

jest

npm i https://pkg.pr.new/jest@15750

jest-changed-files

npm i https://pkg.pr.new/jest-changed-files@15750

jest-circus

npm i https://pkg.pr.new/jest-circus@15750

jest-cli

npm i https://pkg.pr.new/jest-cli@15750

jest-config

npm i https://pkg.pr.new/jest-config@15750

@jest/console

npm i https://pkg.pr.new/@jest/console@15750

@jest/core

npm i https://pkg.pr.new/@jest/core@15750

@jest/create-cache-key-function

npm i https://pkg.pr.new/@jest/create-cache-key-function@15750

jest-diff

npm i https://pkg.pr.new/jest-diff@15750

jest-docblock

npm i https://pkg.pr.new/jest-docblock@15750

jest-each

npm i https://pkg.pr.new/jest-each@15750

@jest/environment

npm i https://pkg.pr.new/@jest/environment@15750

jest-environment-jsdom

npm i https://pkg.pr.new/jest-environment-jsdom@15750

@jest/environment-jsdom-abstract

npm i https://pkg.pr.new/@jest/environment-jsdom-abstract@15750

jest-environment-node

npm i https://pkg.pr.new/jest-environment-node@15750

@jest/expect

npm i https://pkg.pr.new/@jest/expect@15750

@jest/fake-timers

npm i https://pkg.pr.new/@jest/fake-timers@15750

@jest/get-type

npm i https://pkg.pr.new/@jest/get-type@15750

@jest/globals

npm i https://pkg.pr.new/@jest/globals@15750

jest-haste-map

npm i https://pkg.pr.new/jest-haste-map@15750

jest-jasmine2

npm i https://pkg.pr.new/jest-jasmine2@15750

jest-leak-detector

npm i https://pkg.pr.new/jest-leak-detector@15750

jest-matcher-utils

npm i https://pkg.pr.new/jest-matcher-utils@15750

jest-message-util

npm i https://pkg.pr.new/jest-message-util@15750

jest-mock

npm i https://pkg.pr.new/jest-mock@15750

@jest/pattern

npm i https://pkg.pr.new/@jest/pattern@15750

jest-phabricator

npm i https://pkg.pr.new/jest-phabricator@15750

jest-regex-util

npm i https://pkg.pr.new/jest-regex-util@15750

@jest/reporters

npm i https://pkg.pr.new/@jest/reporters@15750

jest-resolve

npm i https://pkg.pr.new/jest-resolve@15750

jest-resolve-dependencies

npm i https://pkg.pr.new/jest-resolve-dependencies@15750

jest-runner

npm i https://pkg.pr.new/jest-runner@15750

jest-runtime

npm i https://pkg.pr.new/jest-runtime@15750

@jest/schemas

npm i https://pkg.pr.new/@jest/schemas@15750

jest-snapshot

npm i https://pkg.pr.new/jest-snapshot@15750

@jest/snapshot-utils

npm i https://pkg.pr.new/@jest/snapshot-utils@15750

@jest/source-map

npm i https://pkg.pr.new/@jest/source-map@15750

@jest/test-result

npm i https://pkg.pr.new/@jest/test-result@15750

@jest/test-sequencer

npm i https://pkg.pr.new/@jest/test-sequencer@15750

@jest/transform

npm i https://pkg.pr.new/@jest/transform@15750

@jest/types

npm i https://pkg.pr.new/@jest/types@15750

jest-util

npm i https://pkg.pr.new/jest-util@15750

jest-validate

npm i https://pkg.pr.new/jest-validate@15750

jest-watcher

npm i https://pkg.pr.new/jest-watcher@15750

jest-worker

npm i https://pkg.pr.new/jest-worker@15750

pretty-format

npm i https://pkg.pr.new/pretty-format@15750

commit: 1813d34

[nicolo-ribaudo]

Ok I give up. @cpojer / @SimenB do you know how to solve that "› 12 obsolete snapshots found" error in Node.js 18, which I assume is due to those tests being skipped in Node.js 18?

[cpojer]

I assume we'll release this as a major, and we'll drop Node 18 next so don't worry about those.

[nicolo-ribaudo]

Oh I was planning to go with this PR first just allowing users to use Babel 8, and then a separate one (major) upgrading the whole repo to it. I'll do the whole upgrade immediately then.