babel.config.js

module.exports = function (api) {
  api.cache(false);

  return {
    "presets": [
      ["@babel/env", {
        "targets": {
          "node": "6.10"
        },
        "useBuiltIns": "entry",
        "loose": true
      }]
    ],
    "plugins": [
      "@babel/plugin-proposal-export-default-from",
      "@babel/plugin-proposal-logical-assignment-operators",
      ["@babel/plugin-proposal-optional-chaining", { "loose": false }],
      ["@babel/plugin-proposal-pipeline-operator", { "proposal": "minimal" }],
      ["@babel/plugin-proposal-nullish-coalescing-operator", { "loose": false }],
      "@babel/plugin-proposal-do-expressions",
  
      ["@babel/plugin-proposal-decorators", { "legacy": true }],
      "@babel/plugin-proposal-function-sent",
      "@babel/plugin-proposal-export-namespace-from",
      "@babel/plugin-proposal-numeric-separator",
      "@babel/plugin-proposal-throw-expressions",
  
      "@babel/plugin-syntax-dynamic-import",
      "@babel/plugin-syntax-import-meta",
      ["@babel/plugin-proposal-class-properties", { "loose": false }],
      "@babel/plugin-proposal-json-strings",
  
      "@babel/plugin-transform-flow-strip-types"
    ]
  };  
}