.babelrc

{
  "env": {
    "development": {
      "presets": ["@babel/preset-env", "@babel/react", "@babel/typescript"],
      "plugins": ["@babel/proposal-class-properties", "@babel/proposal-object-rest-spread"]
    },
    "es": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "modules": "commonjs",
            "targets": {
              "esmodules": true
            }
          }
        ],
        "@babel/react",
        "@babel/typescript"
      ],
      "plugins": [
        "@babel/proposal-class-properties",
        "@babel/proposal-object-rest-spread",
        "@babel/plugin-proposal-optional-chaining"
      ],
      "ignore": ["**/__tests__", "**/*.test.ts", "**/*.d.ts"]
    },
    "umd": {
      "presets": [["@babel/preset-env", { "modules": "umd" }], "@babel/react", "@babel/typescript"],
      "plugins": [
        "@babel/proposal-class-properties",
        "@babel/proposal-object-rest-spread",
        "@babel/plugin-proposal-optional-chaining"
      ],
      "ignore": ["**/__tests__", "__tests__", "**/*.test.ts", "**/*.d.ts"]
    },
    "test": {
      "presets": ["@babel/preset-env", "@babel/react", "@babel/typescript"],
      "plugins": [
        "@babel/proposal-class-properties",
        "@babel/proposal-object-rest-spread",
        "@babel/plugin-proposal-optional-chaining",
        "@babel/plugin-proposal-nullish-coalescing-operator"
      ]
    }
  }
}