Search params

[AlecAivazis]

Route queries can already pull variables from the URL path ([id] → $id). This extends that to the query string: a page query's nullable variables that aren't satisfied by a route segment are now populated from URLSearchParams, with full type safety on both ends.

• visiting /shows?genre=comedy runs the page query with $genre set. Changing the query string re-runs the query
  Repeated keys (?tag=a&tag=b) fill [String!] list variables.
• ` gains a typed, optional `search` prop derived from the destination route's variables
• only nullable variables are eligible, so a missing search param resolves to null and can never turn a valid URL into a failing request. A required variable that isn't backed by a route segment and has no default is now caught at build time with an actionable error, rather than failing at request time.
• restructured and consolidated the navigation hooks (useLocation, useRoute, etc) into a single type-safe useRoute that relies on a newly exported PageRoute value from ./$types to provide type safety

closes #1210

[changeset-bot]

🦋 Changeset detected

Latest commit: ee04473

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
houdini	Minor
houdini-react	Minor
houdini-adapter-auto	Major
houdini-adapter-cloudflare	Major
houdini-adapter-node	Major
houdini-adapter-static	Major

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