Snowpack issue

package.json

{
  "name": "anything",
  "version": "0.1.0",
  "dependencies": {
    "@mapbox/mapbox-sdk": "^0.10.0",
    "@mapbox/polyline": "^1.1.0",
    "@material-ui/core": "^4.8.2",
    "@material-ui/icons": "^4.5.1",
    "@turf/circle": "^6.2.0-alpha.1",
    "@turf/distance": "^6.2.0-alpha.1",
    "@turf/helpers": "^6.2.0-alpha.1",
    "@turf/nearest-point": "^6.0.1",
    "@turf/points-within-polygon": "^6.2.0-alpha.1",
    "@types/mapbox__mapbox-sdk": "^0.6.2",
    "@types/nouislider": "^9.0.5",
    "@types/reflexbox": "^4.0.1",
    "@welldone-software/why-did-you-render": "^6.0.4",
    "antd": "^3.25.1",
    "autocompleter": "^5.2.0",
    "baseui": "^9.95.1",
    "bb26": "^2.0.1",
    "idb": "^5.0.2",
    "lodash.difference": "^4.5.0",
    "loglevel": "^1.6.7",
    "mapbox-gl": "1.5.0",
    "nouislider": "^14.0.3",
    "react": "^16.13.x",
    "react-dom": "^16.13.x",
    "react-icons": "^3.8.0",
    "react-swipeable": "^5.5.1",
    "redux": "^4.0.5",
    "reflexbox": "^4.0.6",
    "styletron-engine-atomic": "^1.4.4",
    "styletron-react": "^5.2.6",
    "ts-polyfill": "^3.8.2"
  },
  "scripts": {
    "start": "snowpack dev",
    "build": "snowpack build",
    "clean": "rm -rf build",
  },
  "browserslist": [
    ">0.2% or last 4 versions",
    "not dead",
    "not ie <= 11"
  ],
  "devDependencies": {
    "@snowpack/plugin-dotenv": "^2.0.5",
    "@snowpack/plugin-react-refresh": "^2.3.9",
    "@snowpack/plugin-typescript": "^1.1.1",
    "@snowpack/plugin-webpack": "^2.2.0",
    "@snowpack/web-test-runner-plugin": "^0.1.5",
    "@types/geojson": "^7946.0.7",
    "@types/jest": "26.0.8",
    "@types/lodash": "^4.14.158",
    "@types/lodash.difference": "^4.5.6",
    "@types/mapbox__polyline": "^1.0.0",
    "@types/react": "16.9.44",
    "@types/react-dom": "16.9.8",
    "@types/snowpack-env": "^2.3.3",
    "@types/styletron-engine-atomic": "^1.1.0",
    "@types/styletron-react": "^5.0.2",
    "@types/styletron-standard": "^2.0.1",
    "@typescript-eslint/eslint-plugin": "^3.7.1",
    "@typescript-eslint/parser": "^3.7.1",
    "@typescript-eslint/typescript-estree": "^3.7.1",
    "eslint": "^6.6.0",
    "eslint-config-airbnb": "^18.2.0",
    "eslint-config-airbnb-typescript": "^9.0.0",
    "eslint-import-resolver-typescript": "^2.2.0",
    "eslint-plugin-import": "^2.22.0",
    "eslint-plugin-jsx-a11y": "^6.3.1",
    "eslint-plugin-react": "^7.20.5",
    "eslint-plugin-react-hooks": "^4.0.8",
    "react-docgen-typescript": "^1.20.1",
    "react-snap": "^1.23.0",
    "snowpack": "^2.18.5",
    "source-map-explorer": "^2.4.2",
    "typescript": "3.9.7"
  },
  "reactSnap": {
    "puppeteerArgs": [
      "--no-sandbox",
      "--disable-setuid-sandbox"
    ]
  }
}

snowpack.config.js

/** @type {import("snowpack").SnowpackUserConfig } */
module.exports = {
  mount: {
    public: '/',
    src: '/_dist_',
  },
  plugins: [
    '@snowpack/plugin-webpack',
    '@snowpack/plugin-react-refresh',
    '@snowpack/plugin-dotenv',
    '@snowpack/plugin-typescript',
  ],
  install: [
  ],
  installOptions: {
    env: { NODE_ENV: 'production' },
  },
  devOptions: {
  },
  buildOptions: {
  },
  proxy: {
  },
  alias: {
    src: './src',
  },
};

tsconfig.json

{
  "compilerOptions": {
    "target": "ES5",
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": false, // turn on after dev
    "noUnusedParameters": false, // prod: true
    "jsx": "preserve",
    "lib": [
      "DOM",
      "DOM.Iterable",
      "ESNext"
    ],
    "baseUrl": ".",
    "paths": {
      "src": ["src"] // this mapping is relative to "baseUrl"
    }
  },
  "include": [
    "src",
    ".eslintrc.js",
    "snowpack.config.js",
  ]
}