ESLint rc config with rules for import sorting and grouping. Requires `npm i -D eslint-plugin-import` to be installed.

.eslintrc.json

{
  "extends": ["prettier", "plugin:prettier/recommended"],
  "plugins": ["prettier", "import"],
  "rules": {
    "import/order": [
      "error",
      {
        "groups": ["builtin", "external", "parent", "sibling", "index"],
        "pathGroups": [
          {
            "pattern": "@custom-lib/**",
            "group": "external",
            "position": "after"
          }
        ],
        "pathGroupsExcludedImportTypes": ["builtin"],
        "alphabetize": {
          "order": "asc"
        },
        "newlines-between": "always"
      }
    ],
    "sort-imports": [
      "error",
      {
        "allowSeparatedGroups": true,
        "ignoreDeclarationSort": true
      }
    ],
    "no-duplicate-imports": "error",
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1,
        "maxEOF": 0,
        "maxBOF": 0
      }
    ],
    "import/first": "error",
    "import/newline-after-import": "error",
    "import/no-duplicates": "error",
    "import/no-unassigned-import": "error",
    "prettier/prettier": [
      "error",
      {
        "singleQuote": false,
        "semi": false,
        "jsxSingleQuote": true
      }
    ]
  }
}