Filter query parameters

[rjyo]

Plan

As mention in #1

Add a new API for filtering out the unwanted parameters:

in the config file .next-boost.js, if we add the following config:

module.exports = {
  ...
  paramFilter: (p) => {
    p === 'fbclid' || p.startsWith('utm_') ? false : true
  },
}

In paramFilter, we just return true for the params you want to keep and false for those you want to remove.

With the filter, /path?fbclid=abc will be transformed to /path before searching the cache.

Effect

Before:

No paramFilter

• miss: /url_a
• miss: /url_a?utm_source=facebook

After:

with paramFilter:

(p) => !p.startsWith('utm_')

• miss: /url_a
• hit: /url_a?utm_source=facebook