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Why am I not seeing a TypeScript error here?

I would expect the following code (inside an arbitrary Class) to show a TypeScript error in VSCode. But it doesn't. Why?

protected someMethod (someArg?: boolean) {

  this.doSomething(someArg)

}

protected doSomething (mustBePassedBoolean: boolean) {

  /* ... */

}

The tooltip doesn't even acknowledge that someArg should be boolean|undefined:

enter image description here

I'm guessing this must be an eslint configuration error because the same thing in TypeScript playground acts as I would expect. But I'm not seeing any eslint configuration errors in the VSCode console.

Any advice on troubleshooting VS Code eslint problems like this?

Edit

It's worth noting that I am seeing some expected TypeScript errors, in the same file. As far as I can tell this seems to only happen with vars I would expect to be cast as |undefined.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/yBvh1Lu
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