Error encountered with Typescript implementation of Passport JS Google OAuth 2.0 Strategy

Currently in the process of migrating a passport JS Google OAuth2 strategy from JavaScript to TypeScript, encountering a TypeScript compile error. The clientID and ClientSecret fields are showing no overload matching the call. Despite both options being defined as string in the interface.

The detailed error message is as below:

TSError: ⨯ Unable to compile TypeScript: middleware/passport.google.ts:12:5 - error TS2769: No overload matches this call. The last overload gave the following error. Type 'string | undefined' is not assignable to type 'string'. Type 'undefined' is not assignable to type 'string'. Type 'string | undefined' is not assignable to type 'string'. Type 'undefined' is not assignable to type 'string'.

An actual image showing the issue can be viewed here:

https://i.sstatic.net/Mbode.jpg

Refer to the interface here for more clarity:

https://i.sstatic.net/ntklG.jpg

Any suggestions or solutions?

typescriptpassport.jspassport-google-oauth

Answer №1

After some investigation, I was able to find a solution to this issue that may be helpful for others facing the same problem. The problem lies in the fact that 'dotenv' is initially undefined, but there are two potential fixes:

  1. To address the undefined values for clientID and clientSecret, you can set default strings like this:

    const clientID: string = process.env.GOOGLE_CLIENT_ID ?? 'someDefaultString'
 const clientSecret: string = process.env.GOOGLE_CLIENT_SECRET ?? 'someDefaultString'

  2. An alternative approach is to modify the passport-google-oauth20 index.d.ts file located at \node_modules\@types\passport-google-oauth20\index.d.ts:

    clientID: string | undefined;
clientSecret: string | undefined;

In my case, I chose the first option as I prefer not to make direct changes to node modules.

Answer №2

To utilize the as string method, follow these steps:

clientApiKey : process.env.GOOGLE_CLIENT_API_KEY as string

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