Typescript InertiaConfig sharedPageProps not merging in usePage return type

[UltraWelfare]

From the docs:
I pasted the example to /types/global.d.ts and usePage typing breaks completely. I figured out that it's missing import '@inertiajs/core' in order for TS to acknowledge it as a module. Once I added that import, the usePage type is back but it doesn't seem to merge the sharedPageProps

My modified global.d.ts:

import '@inertiajs/core';

declare module '@inertiajs/core' {
    export interface InertiaConfig {
        sharedPageProps: {
            name: string;
            auth: { id: number; first_name: string; last_name: string } | null;
        };
        flashDataType: {
            success?: string;
            error?: string;
        };
        errorValueType: string[];
    }
}

The flash is correctly inferred (which also means that the module augmentation is working correctly):

However the props do not contain the name and auth shared props:

I tried to follow the source code of the types and I don't see any clear indication of what's happening.. Could it be an IDE issue?

I'm using the latest PhpStorm 2025.3.2

[UltraWelfare]

Seems like an IDE issue. After writing the shared prop it correctly finds out the type... There has to be a problem on the auto completion part of the IDE (PhpStorm - WebStorm). I'll leave the discussion open just in case someone else happens to fall on the same issue

I've opened a relevant issue in their tracker:
https://youtrack.jetbrains.com/issue/WEB-76564/No-autocompletion-on-declaration-merging-with-an-external-package.