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Upgrading to babel 7 - Take II #5151

Merged
merged 6 commits into from
Sep 25, 2018
Merged

Upgrading to babel 7 - Take II #5151

merged 6 commits into from
Sep 25, 2018

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dennisoelkers
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Description

Motivation and Context

This change is upgrading Babel to the most recent version. It involves bumping dependency versions and changing preset/plugin names. Due to stricter import checking, a minor issue with an import in the OutputList was noticed and fixed.

Additionally to the changes in #5129 (which were reverted in #5146), this PR also includes:

  • A rename of .babelrc to babel.config.js to enable running tests in plugins while importing modules from core (9ec6c86)
  • Configuring env preset to emit cjs modules, to allow add-module-exports to add default-less exports for CommonJS-imports (using require())

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

  • My code follows the code style of this project.
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have read the CONTRIBUTING document.
  • I have added tests to cover my changes.
  • All new and existing tests passed.

Due to a change in Babel 7 that affects resolution of babel configs[1]
(`.babelrc` is now a hierarchical config, while `babel.config.js` is
not), source files outside of the source root of jest will not be
transpiled. That means, plugins running tests were not able to
require/import source files of core.

With this change, `.babelrc` will be renamed to `babel.config.js`, so it
is still used when a plugin imports a file from core.

[1]: jestjs/jest#6053 (comment)
@dennisoelkers dennisoelkers added this to the 3.0.0 milestone Sep 25, 2018
@dennisoelkers dennisoelkers changed the title Upgrading to babel 7 take 2 Upgrading to babel 7 - Take II Sep 25, 2018
@kmerz kmerz merged commit fce7366 into master Sep 25, 2018
@kmerz kmerz deleted the upgrading-to-babel-7-take-2 branch September 25, 2018 10:04
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2 participants