What could be the reason for the absence of a TypeScript error in this situation?

Why is it that the code below (inside an arbitrary Class) does not show a TypeScript error in VSCode as expected?

protected someMethod (someArg?: boolean) {

  this.doSomething(someArg)

}

protected doSomething (mustBePassedBoolean: boolean) {

  /* ... */

}

The tooltip does not recognize that someArg should be of type boolean|undefined:

https://i.stack.imgur.com/0lmTI.png

I suspect this may be due to a misconfiguration in eslint, given that the same code in the TypeScript playground behaves as expected. However, I am unable to identify any eslint configuration errors in the VSCode console.

Are there any suggestions on troubleshooting eslint issues like this in VS Code?

Edit

It's important to note that I am encountering some anticipated TypeScript errors in the same file. It appears this issue only arises with variables that are expected to be assigned as |undefined.

Answer №1

To ensure strict type checking in your TypeScript project, consider adding the following to your tsconfig file:
"strict": true,
https://www.typescriptlang.org/tsconfig#strict

If you prefer not to enforce strict typing globally, but only on function parameters, you can use:

"strictFunctionTypes ": true,

https://www.typescriptlang.org/tsconfig#strictFunctionTypes

Additionally, you may want to enable strict null checks by setting:

"strictNullChecks ": true,

https://www.typescriptlang.org/tsconfig#strictNullChecks

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