add import prop @ FileMigrationProvider.

.github/workflows/test.yml

@@ -205,8 +205,34 @@ jobs:
       - name: Run build with newer TypeScript
         run: npm run build
 
-      - name: Install older TypeScript
-        run: npm i -D typescript@${{ matrix.typescript-version }} tsd@${{ fromJson('{ "^4.6":"0.20.0", "^4.7":"0.22.0", "^4.8":"0.24.1", "^4.9":"0.27.0", "^5.0":"0.28.1", "^5.2":"0.29.0", "^5.3":"0.30.7", "^5.4":"0.31.2" }')[matrix.typescript-version] }}
+      - run: |
+          echo "TS_VERSION=${{ matrix.typescript-version }}" >> $GITHUB_ENV
+          echo "TSD_VERSION=${{ fromJson('{ "^4.6":"0.20.0", "^4.7":"0.22.0", "^4.8":"0.24.1", "^4.9":"0.27.0", "^5.0":"0.28.1", "^5.2":"0.29.0", "^5.3":"0.30.7", "^5.4":"0.31.2" }')[env.TS_VERSION] }} >> $GITHUB_ENV"
 
-      - name: Run tests with older TypeScript
+      - name: Install Typescript (${{ env.TS_VERSION }}) and TSD (${{ env.TSD_VERSION }})
+        run: npm i -D typescript@${{ env.TS_VERSION }} tsd@${{ env.TSD_VERSION }}
+
+      - name: Exclude non-backward compatible tests
+        run: npx tsx ./scripts/exclude-test-files-for-backwards-compat.mts
+
+      - name: Run tests with older TypeScript version
         run: npm run test:typings && npm run test:node:build
+
+  outdated-typescript-version:
+    name: Outdated TypeScript version (<4.6)
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Test outdated TypeScript version
+        run: npm run test:outdatedts && echo "Outdated TypeScript version users are required to upgrade!"

.npmignore

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

outdated-typescript.d.ts

@@ -0,0 +1,5 @@
+import type { KyselyTypeError } from './dist/cjs/util/type-error'
+
+declare const Kysely: KyselyTypeError<'The installed TypeScript version is outdated and cannot guarantee type-safety with Kysely. Please upgrade to version 4.6 or newer.'>
+declare const RawBuilder: KyselyTypeError<'The installed TypeScript version is outdated and cannot guarantee type-safety with Kysely. Please upgrade to version 4.6 or newer.'>
+declare const sql: KyselyTypeError<'The installed TypeScript version is outdated and cannot guarantee type-safety with Kysely. Please upgrade to version 4.6 or newer.'>