.babelrc

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "modules": false
      }
    ],
    "@babel/preset-react",
    "@babel/preset-flow"
  ],
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    "@babel/plugin-proposal-do-expressions",
    "@babel/plugin-proposal-export-default-from",
    "@babel/plugin-proposal-export-namespace-from",
    "@babel/plugin-proposal-function-sent",
    "@babel/plugin-proposal-json-strings",
    "@babel/plugin-proposal-logical-assignment-operators",
    "@babel/plugin-proposal-nullish-coalescing-operator",
    "@babel/plugin-proposal-numeric-separator",
    "@babel/plugin-proposal-optional-chaining",
    [
      "@babel/plugin-proposal-pipeline-operator",
      {
        "proposal": "minimal"
      }
    ],
    "@babel/plugin-proposal-throw-expressions",
    "@babel/plugin-syntax-dynamic-import",
    "@babel/plugin-syntax-import-meta"
  ],
  "env": {
    "production": {
      "plugins": [
        "array-includes",
        "@babel/plugin-transform-flow-strip-types",
        "@babel/plugin-transform-object-assign"
      ]
    },
    "commonjs": {
      "plugins": [
        [
          "@babel/plugin-transform-modules-commonjs",
          {
            "loose": true
          }
        ],
        "@babel/plugin-transform-flow-strip-types",
        "@babel/plugin-transform-object-assign",
        "array-includes"
      ]
    },
    "test": {
      "plugins": [
        "@babel/plugin-transform-modules-commonjs"
      ],
      "sourceMaps": "both"
    }
  }
}