Drop Node.js 20 support and enforce erasable TypeScript syntax (#1671)

* Initial plan

* Drop Node.js 20 support, upgrade to TypeScript 5.9, add erasableSyntaxOnly, convert enum to const

Co-authored-by: typicode <5502029+typicode@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: typicode <5502029+typicode@users.noreply.github.com>

Author: Copilot

.github/workflows/node.js.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x, 22.x]
+        node-version: [22.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:

.github/workflows/npm-publish.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
       - run: npm ci
       - run: npm test
 
@@ -30,7 +30,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           registry-url: https://registry.npmjs.org/
       - run: npm ci
       - run: npm publish --provenance --access public

package-lock.json

@@ -12,7 +12,7 @@
     "views"
   ],
   "engines": {
-    "node": "^20.19.0 || >=22.12.0"
+    "node": ">=22.12.0"
   },
   "scripts": {
     "dev": "tsx watch src/bin.ts fixtures/db.json",
@@ -40,7 +40,7 @@
     "tempy": "^3.1.0",
     "tsx": "^4.19.1",
     "type-fest": "^4.26.1",
-    "typescript": "^5.6.2"
+    "typescript": "^5.9.3"
   },
   "dependencies": {
     "@tinyhttp/app": "^2.4.0",

package.json

@@ -24,14 +24,16 @@ export function isData(obj: unknown): obj is Record<string, Item[]> {
   )
 }
 
-enum Condition {
-  lt = 'lt',
-  lte = 'lte',
-  gt = 'gt',
-  gte = 'gte',
-  ne = 'ne',
-  default = '',
-}
+const Condition = {
+  lt: 'lt',
+  lte: 'lte',
+  gt: 'gt',
+  gte: 'gte',
+  ne: 'ne',
+  default: '',
+} as const
+
+type Condition = typeof Condition[keyof typeof Condition]
 
 function isCondition(value: string): value is Condition {
   return Object.values<string>(Condition).includes(value)

src/service.ts

@@ -2,6 +2,7 @@
   "extends": "@sindresorhus/tsconfig",
   "exclude": ["src/**/*.test.ts"],
   "compilerOptions": {
-    "outDir": "./lib"
+    "outDir": "./lib",
+    "erasableSyntaxOnly": true
   }
 }