strapi/packages/core/upload/.eslintrc

{
  "root": true,
  "overrides": [
    {
      "files": ["admin/**/*"],
      "extends": ["custom/front"],
      "rules": {
        "import/extensions": "off"
      }
    },
    {
      "files": ["**/*"],
      "excludedFiles": ["admin/**/*"],
      "extends": ["custom/back"]
    }
  ]
}