babel.config.json

{
  "presets": [],
  "plugins": [],
  "env": {
    "commonjsNode": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "10"
            },
            "modules": "commonjs"
          }
        ]
      ]
    },
    "esmNode": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "10"
            },
            "modules": false
          }
        ]
      ]
    },
    "commonjsBrowser": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "chrome": "49",
              "edge": "15",
              "firefox": "53",
              "safari": "11"
            },
            "bugfixes": true,
            "modules": "commonjs"
          }
        ]
      ]
    },
    "esmBrowser": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "chrome": "49",
              "edge": "15",
              "firefox": "53",
              "safari": "11"
            },
            "bugfixes": true,
            "modules": false
          }
        ]
      ]
    }
  }
}