New project deno-ts error with wouter

[d9k]

I created project with deno run -A -r https://deno.land/x/ultra/create.ts as https://ultrajs.dev/create-project says, choose wouter and get an error

'SearchParamsContext.Provider' cannot be used as a JSX component.
  Its return type 'ReactNode' is not a valid JSX element.
    Type 'undefined' is not assignable to type 'Element | null'. 
(deno-ts)

at <SearchParamsContext.Provider value={state}> line

in src/wouter/index.tsx.

vscode 1.80.0, vscode-deno v 3.25.0, deno 1.34.3, ultra 2.38

.vscode/settings.json:

{
    "deno.enable": true,
    "deno.lint": true,
    "deno.unstable": true,
    "deno.importMap": "./importMap.json"
}

[d9k]

Issue can be reproduced without VSCode: deno run -A --check --watch ./server.tsx

[d9k]

the doc says

> Can I use TypeScript and/or JSX?

If you want.

So it is an issue.

[d9k]

Running after deno upgrade automagically fixed an error

> deno upgrade
> deno --version
deno 1.37.1
> deno run -A --check --watch ./server.tsx

Thanks, @lePichu!