FeDirect/static/data_migration.mts

import { LocalStorage } from "./storage_manager.mjs"

type InstanceV0 = {
    name: string,
    origin: string,
    software: string,
    iconURL?: string,
    preferredFor?: string[],
}
type LocalStorageV0 = {
    version: undefined,
    instances: InstanceV0[],
}

type LocalStorageV1 = LocalStorage;

function migrate0to1(s: LocalStorageV0): LocalStorageV1 {
    return {
        version: 1,
        instances: s.instances.map(i => ({
            preferredFor: i.preferredFor ?? [],
            ...i
        }))
    };
}

type AnyLocalStorage = LocalStorageV0 | LocalStorageV1;

export default function migrate(storage: AnyLocalStorage): LocalStorage {
    switch (storage.version) {
        case undefined:
            storage = migrate0to1(storage);
        case 1:
        default:
            return storage;
    }
}