.babelrc

{
  "presets": [["@babel/env"], "@babel/preset-typescript"],
  "plugins": [
    "@babel/plugin-transform-runtime",
    "@babel/proposal-class-properties",
    "@babel/proposal-object-rest-spread",
    ["@babel/plugin-proposal-nullish-coalescing-operator"],
    ["@babel/plugin-proposal-optional-chaining"]
  ]
}