"defaults" query in .browserslistrc is not accepted by babel-preset-env

[htulipe]

Bug Report

• I would like to work on a fix!

Current Behavior
I have a . browserlistrc file that contains the defaults query. I don't have targets option defined in babel-preset-env options. With that setup, the preset includes 148 core-js imports.

If I change this setup and define the targets option to defaults I would expect the output to be the same. It is not. The preset includes 129 core-js imports.

Note that this happens only with the defaults query. If I target for instance Chrome 75, both setups work the same.

Input Code
See:
https://github.com/htulipe/bug-babel-preset-env

In lib you'll find a file compiled without the targets option and another with the option defined.

Expected behavior/code

I would expect that defining defaults in .browserslistrc or in the preset options to ouput the same result.

Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)

See sample repo

Environment

  System:
    OS: macOS 10.15.2
  Binaries:
    Node: 12.13.1 - ~/.nvm/versions/node/v12.13.1/bin/node
    Yarn: 1.21.1 - /usr/local/bin/yarn
    npm: 6.12.1 - ~/.nvm/versions/node/v12.13.1/bin/npm
  npmPackages:
    @babel/cli: ^7.7.7 => 7.7.7
    @babel/core: ^7.7.7 => 7.7.7
    @babel/preset-env: ^7.7.7 => 7.7.7

[babel-bot]

Hey @htulipe! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite."

[JLHwung]

Closing this as duplicate of #9962 , it is fixed in #10897. However we can not ship it until Babel 8 because it is a breaking change.

As a workaround, you can specify defaults again in targets.browsers. We recognize that it is not ideal but could not ship in Babel 7 because we are changing the behaviour of default options.

[["@babel/preset-env", { "targets": "defaults" }]]

@htulipe A personal thank-you for this report and the reproduction repo!

[htulipe]

Sorry I missed that @JLHwung, thanks for the link and the workaround.

For those stumbling on the same issue, I got around it by "expliciting" defaults. Meaning I put > 0.5%, last 2 versions, Firefox ESR, not dead in my .browserslist file. Works fine.