How do I use @rollup/plugin-inject (or something similar) to inject global functions?

[StephanBijzitter]

Summary

Using Storybook 7 with @vitejs/plugin-react-swc

My problem is two-fold:
My stories (some of them) depend on files that use a globally injected function __ (using webpack) to translate variables, a very truncated example would be:

// some-file.ts
export const units = [
    {text: __('celcius'), value: '°C'},
    {text: __('fahrenheit'), value: '°F'}
] as const satisfies {
    text: string;
    value: string;
}[];

Other stories depend on Dexie to load data from indexedDB, but I want to use fake-indexeddb to make sure the stories are the same for everyone and don't depend on what data they happen to have available.

With @rollup/plugin-inject I expected every file using __ to have import {__} from '...path.../translations-shim.ts'; injected into them and the file that sets up dexie to have injected import {indexedDB} from 'fake-indexeddb' into it,

but... it doesn't seem to do anything at all. What am I doing wrong?

Additional information

    viteFinal: async (config, options) => {
        const injectPlugin = inject({
            include: ['*.ts', '*.tsx'],
            __: [path.resolve(__dirname, 'translations-shim.ts'), '__'],
            indexedDB: ['fake-indexeddb', 'indexedDB']
        });

        return {
            ...config,
            plugins: [{
                enforce: 'pre',
                ...injectPlugin
            }, ...config.plugins!]
        };
    },

Create a reproduction

If really needed I can set one up