How to correctly configure eslint-plugin-import in Next.js 15 with TypeScript and path aliases?

I'm working with a Next.js 15 project using TypeScript, and I'm trying to properly configure eslint-plugin-import to work with path aliases (like @/), as well as import sorting and unresolved path detection.

I’ve already done the following:

• I created a tsconfig.json with this paths setup:

  {
    "compilerOptions": {
      "baseUrl": ".",
      "paths": {
        "@/*": ["src/*"]
      }
    }
  }
  

• I installed all required packages:

  npm install --save-dev eslint eslint-plugin-import eslint-import-resolver-typescript
  

  import importPlugin from 'eslint-plugin-import';
  
  export default [
    {
      files: ['**/*.{js,ts,jsx,tsx}'],
      plugins: {
        import: importPlugin,
      },
      settings: {
        'import/resolver': {
          typescript: {
            project: './tsconfig.json',
          },
          node: {
            extensions: ['.js', '.jsx', '.ts', '.tsx'],
          },
        },
      },
      rules: {
        'import/no-unresolved': 'error',
        'import/order': [
          'error',
          {
            groups: ['builtin', 'external', 'internal'],
            pathGroups: [
              {
                pattern: '@/**',
                group: 'internal',
                position: 'after',
              },
            ],
            'newlines-between': 'always',
            alphabetize: { order: 'asc', caseInsensitive: true },
          },
        ],
      },
    },
  ];
  

Even after all of this:

• ESLint does not report unresolved imports when I write something like import x from '@/not-existing-file'.

• The import/order rule doesn't recognize path groups correctly.

• Aliases like @/components/Button sometimes trigger import/no-unresolved.

I expect

• import/no-unresolved to correctly validate all imports including aliases.

• import/order to correctly group and sort imports (especially @/** under "internal").

What are the correct steps to fully configure eslint-plugin-import in a Next.js 15 project using flat config, TypeScript, and path aliases?