What is the purpose of build.watch.include and how do I configure vite to watch other files?

[smac89]

I thought I could use this to watch the vite.config.ts file so that everything reloads when that file changes, but it actually doesn't trigger any changes.

My config file:

import { defineConfig, type UserConfig } from "vite";
import tsconfigPaths from "vite-tsconfig-paths";

export default defineConfig(async ({ mode }): Promise<UserConfig> => {
    ...
    return {
        define: {
            __SCHEDULE_API_URL__: JSON.stringify(
                process.env.SCHEDULE_API_URL ?? "http://localhost:5000"
            ),
        },
        plugins: [
            tsconfigPaths(),
            ...
        ],
        build: {
            sourcemap: mode === "development",
            watch: {
                buildDelay: 500,
                include: ["./vite.config.ts"], // <- here...
            },
        },
        ...
    };
});

To build and watch, I use the command: vite build --mode='development' --watch.

What am I missing? How do I tell vite to watch other files in the project directory and trigger a rebuild when they change?