pipe/unstable_pipe

Question

I cant seem to find it? according to the docs I can chain middlewares using pipe in v10 but the feature isn't there
this is a simple example from the docs

`const t =  initTRPC.context().create();

export const middleware = t.middleware;
export const router = t.router;

const checkTokenMW = middleware(async ({ctx, next}) = {
    if(!ctx.req.headers.authorization){
        throw new TRPCError({code: 'UNAUTHORIZED'});
    }

ctx.userData.userId = 3;

return next({ctx});
});

I want to do something like this checkTokenMW.unstable_pipe(loggerMW) - or like in the example entering the middleware code directly
but there is no method to do this, am i doing something wrong or maybe how to do this changed and the docs aren't updated?
can you please help me figure this out?

pipe/unstable_pipe

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