Error in server file of NextJS due to Typescript issue

My current setup includes the following package versions:

  • next v8.1.1-canary.42
  • @types/next v8.0.5

server.js

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

tsconfig.json

{
  "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"]
}

An error occurs in TypeScript with the message:

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

I am puzzled by this Typescript error. Can someone provide insight into why this error is happening and whether any manual adjustments to Next types are required?

javascripttypescriptnext.js

Answer №1

Your code is functional with next version 8.1.0 and @types/next version 8.0.0, but encounters issues with the experimental version 8.1.1-canary.42. This suggests that there may have been some incompatible modifications made in the newer release causing discrepancies in the existing .d.ts files. The volunteer-maintained @types/* packages tend to lag behind in updates, especially for pre-released software versions.

Have you considered upgrading to the latest stable version of next (v8.1.0)?

If not, another approach could be to analyze the changes between versions and generate your own set of .d.ts files tailored to your specific needs.

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