.babelrc

{
    "presets": [
        "@babel/preset-typescript",
        "@babel/preset-env",
        "@babel/preset-react"
    ],
    "plugins": [
        ["@babel/plugin-proposal-decorators", { "legacy": true }],
        ["@babel/plugin-proposal-class-properties", { "loose": true }],
        ["@babel/plugin-proposal-private-methods", { "loose": true }],
        ["@babel/plugin-transform-runtime", { "loose": true }],
        ["@babel/plugin-proposal-private-property-in-object", { "loose": true }]
    ],
    "env": {
      "production": {
        "compact": true,
        "comments": false,
        "minified": true
      },
      "test": {
        "plugins": [
          ["istanbul", {
            "exclude": [
              // exclude from karma reporter
              "tests/**/*"
            ]
          }]
        ]
      }
    }
}