chore: Use React 19 RC

There's now a peer dependency on the latest Next.js canaries onto React 19,
so until it is officially released, we'll have to use the `rc` dist tag.

Unfortunately, React 19 types don't export the `cache` experimental feature,
which Next.js embeds. So we have to cheat a bit with TypeScript here.

This fixes the canary test build. There are no public changes to deps in `nuqs`,
so intermediary releases until Next 15 / React 19 are published should be possible
without breaking semver in dependent apps.

Author: franky47

packages/e2e/package.json

@@ -22,12 +22,12 @@
   "dependencies": {
     "next": "14.2.3",
     "nuqs": "workspace:*",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1"
+    "react": "rc",
+    "react-dom": "rc"
   },
   "devDependencies": {
     "@types/node": "^20.12.8",
-    "@types/react": "^18.3.1",
+    "@types/react": "^18.3.2",
     "@types/react-dom": "^18.3.0",
     "@types/semver": "^7.5.8",
     "@types/webpack": "^5.28.5",

packages/nuqs/package.json

@@ -72,12 +72,12 @@
   "devDependencies": {
     "@size-limit/preset-small-lib": "^11.1.2",
     "@types/node": "^20.12.8",
-    "@types/react": "^18.3.1",
+    "@types/react": "^18.3.2",
     "@types/react-dom": "^18.3.0",
     "next": "14.2.3",
     "npm-run-all": "^4.1.5",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "react": "rc",
+    "react-dom": "rc",
     "size-limit": "^11.1.2",
     "tsd": "^0.30.7",
     "tsup": "^8.0.2",

packages/nuqs/src/cache.ts

@@ -1,3 +1,4 @@
+// @ts-expect-error (not exported in types for React 19 beta, but available in Next.js)
 import { cache } from 'react'
 import { error } from './errors'
 import type { ParserBuilder } from './parsers'
@@ -29,7 +30,7 @@ export function createSearchParamsCache<
   // whereas a simple object would be bound to the lifecycle of the process,
   // which may be reused between requests in a serverless environment
   // (warm lambdas on Vercel or AWS).
-  const getCache = cache<() => Cache>(() => ({
+  const getCache: () => Cache = cache<() => Cache>(() => ({
     searchParams: {}
   }))
   function parse(searchParams: SearchParams) {

packages/nuqs/src/tests/parsers.test-d.ts

@@ -1,3 +1,4 @@
+import React from 'react'
 import { expectError, expectType } from 'tsd'
 import { parseAsString } from '../../dist'