Laravel Mix LiveReload doesn't work with Valet .test domain

Question

I run my Laravel app locally with Valet (with the secure option with https) on https://example.test. When I follow the instructions:

npm install webpack-livereload-plugin@1 --save-dev

And put the following in webpack.mix.js

var LiveReloadPlugin = require('webpack-livereload-plugin');

mix.webpackConfig({
    plugins: [new LiveReloadPlugin()]
});

And then put this in my Blade file

@env('local')
  <script src="http://localhost:35729/livereload.js"></script>
@endenv

And then run npm run watch (the docs say npx mix watch but I guess that's the same?) nothing happens. I guess that's because the URL http://localhost:35729/livereload.js is incorrect? There's nothing in the docs that explains how this works with Valet.

I have also tried the instructions from this answer

Add mix.browserSync('example.test'); to webpack.mix.js. But when I then npm run watch it opens localhost:8080?

Not sure what I need to do to get a live reload to work.