request.params not available in handle hook as docs / types indicate

Describe the bug Request.params is null in handle hook.

Logs

To Reproduce

1. Create a route that uses params, e.g. src/routes/[product]/index.svelte
2. Create a hook with handle function located at src/hooks.ts
3. Try to access request.params in handle function

Example repo: https://github.com/RaeesBhatti/svelte-params-bug

Expected behavior request.params should be available in handle function of hooks.

Stacktraces

Information about your SvelteKit Installation:

Diagnostics

  System:
    OS: macOS 11.2.3
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 535.77 MB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 14.8.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 6.14.7 - /usr/local/bin/npm
  Browsers:
    Chrome: 90.0.4430.85
    Safari: 14.0.3
    Safari Technology Preview: 14.2
  npmPackages:
    @sveltejs/kit: next => 1.0.0-next.87 
    svelte: ^3.29.0 => 3.37.0 

• Your browser: Safari Version 14.0.3 (16610.4.3.1.7)

• Your adapter: Cloudflare Worker but this issues comes up even in dev mode.

Severity Blocking usage of SvelteKit because I need params to fetch the right data from database.

Additional context

[kamholz]

What’s the current recommended way to deal with this? I have a bunch of endpoints with an [id] param and I need to short-circuit them and return an error if the param is not in a valid format. I was hoping to do it in handle but it looks like I need to add this boilerplate to every handler (get, post, del, etc.) of every endpoint. Is there no better way? The only way I can think of is to write a function that wraps every handler, so:

export const get = validateParams(async ({ params }) => { ... });

I suppose this is workable but seems pretty clunky.

[georgecrawford]

See related discussion on param validators here: https://github.com/sveltejs/kit/issues/4291