enforce min TS version

.npmignore

@@ -16,4 +16,4 @@ package-lock.json
 tsconfig-base.json
 tsconfig-cjs.json
 tsconfig.json
-
+CONTRIBUTING.md

outdated-typescript.d.ts

@@ -0,0 +1,23 @@
+type ErrorMessage =
+  'Your TypeScript version is too old. Please upgrade to >= 4.6.'
+export type Kysely = ErrorMessage
+export type sql = ErrorMessage
+export type expressionBuilder = ErrorMessage
+export type Expression = ErrorMessage
+export type ColumnType = ErrorMessage
+export type Generated = ErrorMessage
+export type GeneratedAlways = ErrorMessage
+export type JSONColumnType = ErrorMessage
+export type Selectable = ErrorMessage
+export type Insertable = ErrorMessage
+export type Updateable = ErrorMessage
+export type MysqlDialect = ErrorMessage
+export type PostgresDialect = ErrorMessage
+export type SqliteDialect = ErrorMessage
+export type MssqlDialect = ErrorMessage
+export type InferResult = ErrorMessage
+export type CompiledQuery = ErrorMessage
+export type UpdateResult = ErrorMessage
+export type InsertResult = ErrorMessage
+export type DeleteResult = ErrorMessage
+export type MergeResult = ErrorMessage

package.json

@@ -7,10 +7,17 @@
     "url": "git://github.com/kysely-org/kysely.git"
   },
   "engines": {
-    "node": ">=14.0.0"
+    "node": ">=18.0.0"
   },
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
+  "typesVersions": {
+    "<4.6": {
+      "*": [
+        "outdated-typescript.d.ts"
+      ]
+    }
+  },
   "exports": {
     ".": {
       "import": "./dist/esm/index.js",