Having trouble with NextJS TypeScript and the randomUUID?() function? If you're seeing the error TS2386 that says "Overload signatures must all be

In my project setup, I have a mono-repo structure utilizing Lerna for managing 2 NextJS projects and 1 shared project.

I recently attempted to integrate typescript. The NextJS projects seem to be functioning correctly (following the documentation), but I encountered an issue while compiling the other project.

Here are the package versions:

"next": "^12.0.1",
"typescript": "^4.6.2"

This is the TypeScript configuration (tsconfig.json):

{
    "compilerOptions": {
        "module": "commonjs",
        "esModuleInterop": true,
        "allowSyntheticDefaultImports": true,
        "strict": false,
        "target": "es6",
        "noImplicitAny": true,
        "moduleResolution": "node",
        "sourceMap": false,
        "outDir": "dist",
        "allowJs": true,
        "baseUrl": ".",
        "incremental": true,
        "resolveJsonModule": true,
        "isolatedModules": true,
        "jsx": "preserve"
    },
    "exclude": [
        "dist",
        "jest.*.js",
    ]
}

The encountered error message is as follows:

../../node_modules/next/types/index.d.ts:203:5
error TS2386: Overload signatures must all be optional or required.

203:5     randomUUID?(): string

Answer №1

It seems like the upcoming release of next.js 12.1.1 will address this issue as per this PR.

While waiting for the fix, you have a few options: 1) revert typescript to version 4.5.5, 2) try out the 12.1.1-canary builds of next.js, or 3) enable skipLibCheck as suggested by jsejcksn and salar-hafezi.

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