import next from 'next';
const app = next({ dev: isDevelopment });

{
  "compilerOptions": {
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "alwaysStrict": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "jsx": "preserve",
    "lib": ["dom", "es2017"],
    "module": "commonjs",
    "moduleResolution": "node",
    "noEmit": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "removeComments": true,
    "resolveJsonModule": true,
    "sourceMap": true,
    "strict": true,
    "target": "esnext"
  },
  "exclude": ["node_modules"]
}

Cannot invoke an expression whose type lacks a call signature. Type 'typeof import(".../node_modules/next/types/index")' has no compatible call signatures.