1.Test/xr/node_modules/browserslist

Browserslist

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The config to share target browsers and Node.js versions between different front-end tools. It is used in:

• Autoprefixer
• Babel
• postcss-preset-env
• eslint-plugin-compat
• stylelint-no-unsupported-browser-features
• postcss-normalize
• obsolete-webpack-plugin

All tools will find target browsers automatically, when you add the following to package.json:

  "browserslist": [
    "defaults and fully supports es6-module",
    "maintained node versions"
  ]

Or in .browserslistrc config:

# Browsers that we support

defaults and fully supports es6-module
maintained node versions

Developers set their version lists using queries like last 2 versions to be free from updating versions manually. Browserslist will use caniuse-lite with Can I Use data for this queries.

You can check how config works at our playground: browsersl.ist

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Docs

Read full docs here.