.babelrc

{
    "env": {
      "production": {
        "presets": [["@babel/preset-env", {
          "targets": {
            "browsers": [
              ">0.25%",
              "not op_mini all"
            ]
          }
        }],  "@babel/preset-react", "@babel/preset-flow"],
        "plugins": [
          "@babel/plugin-syntax-dynamic-import",
          "@babel/plugin-proposal-object-rest-spread",
          "@babel/plugin-proposal-class-properties",
        ]
      },
      "development": {
        "presets": [["@babel/preset-env", {
          "targets": {
            "browsers": [
              ">0.25%",
              "not op_mini all"
            ]
          }
        }],  "@babel/preset-react", "@babel/preset-flow"],
        "plugins": [
          "@babel/plugin-syntax-dynamic-import",
          "@babel/plugin-proposal-object-rest-spread",
          "@babel/plugin-proposal-class-properties",
        ]
      },
      "test": {
        "presets": ["@babel/preset-env",  "@babel/preset-react", "@babel/preset-flow"],
        "plugins": ["@babel/plugin-proposal-object-rest-spread", "@babel/plugin-proposal-class-properties"]
      }
    }
  }