[Tests] split type-check matrix by ESLint major

Run published type checks against both ESLint 7-9.
Use per-matrix dependency setup and exclude unsupported TS combinations for ESLint 10.

Author: ljharb

.github/workflows/type-check.yml

@@ -7,11 +7,15 @@ permissions:
 
 jobs:
   test:
-    name: TS ${{ matrix.ts_version }}, "${{ matrix.ts_lib }}"
+    name: ESLint ${{ matrix.eslint_version }}, TS ${{ matrix.ts_version }}, "${{ matrix.ts_lib }}"
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
+        eslint_version:
+          - '7'
+          - '8'
+          - '9'
         ts_version:
           # The official ESLint types are not compatible with TS 3.9
           # - 3.9
@@ -29,6 +33,20 @@ jobs:
           - es2015,dom
           - es2020
           - esnext
+        exclude:
+          # ESLint 9 ships types via @eslint/core which requires TS >= 5.0
+          - eslint_version: '9'
+            ts_version: '4.0'
+          - eslint_version: '9'
+            ts_version: 4.1
+          - eslint_version: '9'
+            ts_version: 4.2
+          - eslint_version: '9'
+            ts_version: 4.3
+          - eslint_version: '9'
+            ts_version: 4.4
+          - eslint_version: '9'
+            ts_version: 4.5
     steps:
       - uses: actions/checkout@v4
         with:
@@ -41,6 +59,18 @@ jobs:
           node-version: 'lts/*'
           skip-ls-check: true
 
+      - name: select eslint types
+        run: |
+          if [ "${{ matrix.eslint_version }}" = "9" ]; then
+            npm uninstall --no-save @types/eslint
+            npm install --no-save eslint@^9 typescript@^5
+          elif [ "${{ matrix.eslint_version }}" = "7" ]; then
+            npm install --no-save eslint@^7 @types/eslint@7.2.10
+          else
+            npm uninstall --no-save @types/eslint
+            npm install --no-save eslint@^${{ matrix.eslint_version }}
+          fi
+
       - name: build types
         run: npm run build-types
 
@@ -60,6 +90,15 @@ jobs:
         run: npm install
         working-directory: test-published-types
 
+      - name: select eslint for published types
+        run: |
+          if [ "${{ matrix.eslint_version }}" = "7" ]; then
+            npm install --no-save eslint@^7
+          else
+            npm install --no-save eslint@^${{ matrix.eslint_version }}
+          fi
+        working-directory: test-published-types
+
       - name: install eslint-plugin-react and typescript version ${{ matrix.ts_version }}
         run: npm install --no-save "$ESLINT_PLUGIN_REACT_PATH" typescript@${{ matrix.ts_version }}
         working-directory: test-published-types

types/eslint-core-augment.d.ts

@@ -0,0 +1,13 @@
+import '@eslint/core';
+
+declare module '@eslint/core' {
+  interface SettingsConfig {
+    react?: {
+      pragma?: string;
+      fragment?: string;
+      createClass?: string;
+    };
+  }
+}
+
+export {};