chore(deps-dev): eslint 10 and vitest 4, holding typescript at 5 (#35)

* chore(deps-dev): eslint 10 and vitest 4, holding typescript at 5

Splits the dev-dependencies group bump. Two of its three majors land here;
the third cannot land at all yet.

eslint 9 -> 10 and vitest 1 -> 4 are clean: no config or source change, and
the emitted dist/index.d.ts is byte-identical to main, so nothing about the
published type surface moves.

typescript 5 -> 6 is held back. openapi-typescript 7.13.0, the newest
release, still declares `peer typescript@"^5.x"`, so a clean `npm ci` with
TypeScript 6 fails to resolve. That is what makes the grouped bump red, and
no amount of retrying the group will fix it.

Worth recording for whenever that peer range widens: TypeScript 6 also
breaks `tsup --dts`. tsup 8.5.1 hardcodes `baseUrl: compilerOptions.baseUrl
|| "."` when it builds declarations, and TS 6 errors on `baseUrl` as
deprecated (TS5101). Adding `"ignoreDeprecations": "6.0"` to tsconfig.json
clears it, but only until TypeScript 7 removes the option outright, so the
durable answer is a tsup that stops injecting it, or moving declaration
emit to tsc.

Verified from a clean `npm ci`: typecheck, lint, unit tests (64), build and
live smoke tests all pass.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* chore: drop Node 18, moving the tested floor to 20

eslint 10 and vitest 4 both require Node 20 or newer, so the Node 18 lane
fails on `npm ci` while 20 and 22 pass. Node 18 reached end of life on
2025-04-30.

The constraint is entirely in the dev toolchain — nothing in the shipped
bundle needs Node 20. The choice was between quietly dropping the lane while
still advertising `engines: >=18`, and withdrawing a support claim nothing
verifies. This does the second: matrix moves to 20/22/24, `engines` to
`>=20`, README and CHANGELOG updated to match.

Consumers still on Node 18 should stay on 7.1.x.

Note for whoever merges: branch protection still requires `Test (Node 18)`,
which no longer exists. The required contexts need updating to
`Test (Node 20)`, `Test (Node 22)`, `Test (Node 24)` or this cannot merge.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: cubehouse

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [18, 20, 22]
+        node: [20, 22, 24]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

CHANGELOG.md

@@ -5,6 +5,27 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+
+- **Minimum supported Node is now 20.** Node 18 reached end of life on
+  2025-04-30 and is no longer tested. `engines` moves from `>=18` to `>=20`,
+  and CI now runs Node 20, 22 and 24.
+
+  Nothing in the shipped bundle needed Node 18 specifically; the constraint
+  arrives from the dev toolchain, where eslint 10 and vitest 4 both require
+  Node 20 or newer. Rather than keep claiming support for a runtime nothing
+  verifies, the claim is withdrawn. If you are still on Node 18, stay on
+  7.1.x.
+
+- Dev dependencies: eslint 9 to 10, vitest 1 to 4. No change to the published
+  type surface: `dist/index.d.ts` is byte-identical to 7.1.0's.
+
+  TypeScript stays on 5.x. `openapi-typescript@7.13.0` still declares
+  `peer typescript@"^5.x"`, so TypeScript 6 cannot be installed here until
+  that range widens upstream.
+
 ## [7.1.0] - 2026-09-01
 
 ### Fixed

README.md

@@ -10,7 +10,7 @@ A typed, modern TypeScript/JavaScript SDK for the [ThemeParks.wiki](https://api.
 npm i themeparks
 ```
 
-Runs on Node 18+, evergreen browsers, Deno, Bun, and Cloudflare Workers. Zero runtime dependencies.
+Runs on Node 20+, evergreen browsers, Deno, Bun, and Cloudflare Workers. Zero runtime dependencies.
 
 ## Print live wait times
 
@@ -265,7 +265,7 @@ v7 is a full TypeScript rewrite. It replaces the v6 OpenAPI-Generator surface wi
 
 ## Supported runtimes
 
-- Node 18, 20, 22
+- Node 20, 22, 24
 - Evergreen browsers
 - Deno
 - Bun