test: ensure @eslint/markdown works with both ESLint v9 and v10

.github/workflows/ci.yml

@@ -48,14 +48,14 @@ jobs:
         strategy:
             matrix:
                 os: [ubuntu-latest]
-                eslint: [9]
+                eslint: [9.15.0, 9.x, 10.x]
                 node: [25.x, 24.x, 22.x, 20.x, "20.19.0"]
                 include:
                     - os: windows-latest
-                      eslint: 9
+                      eslint: latest
                       node: lts/*
                     - os: macOS-latest
-                      eslint: 9
+                      eslint: latest
                       node: lts/*
         runs-on: ${{ matrix.os }}
         steps:
@@ -69,8 +69,8 @@ jobs:
               run: npm install
               env:
                   CI: true
-            - name: Install ESLint@${{  matrix.eslint  }}
-              run: npm install eslint@${{  matrix.eslint  }}
+            - name: Install ESLint@${{ matrix.eslint }}
+              run: npm install -D eslint@${{ matrix.eslint }} @eslint/js@${{ matrix.eslint }}
             - name: Test
               run: npm run test
 

examples/react/package.json

@@ -5,9 +5,9 @@
     "test": "eslint ."
   },
   "devDependencies": {
-    "@eslint/js": "^9.7.0",
-    "eslint": "^9.7.0",
-    "eslint-plugin-react": "^7.35.0",
+    "@eslint/js": "^9.39.4",
+    "eslint": "^9.39.4",
+    "eslint-plugin-react": "^7.37.5",
     "globals": "^13.24.0"
   }
 }

examples/typescript/package.json

@@ -5,9 +5,9 @@
     "test": "eslint ."
   },
   "devDependencies": {
-    "@eslint/js": "^9.7.0",
-    "eslint": "^9.15.0",
-    "typescript": "^5.8.3",
-    "typescript-eslint": "^8.15.0"
+    "@eslint/js": "^10.0.1",
+    "eslint": "^10.0.3",
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.57.0"
   }
 }

package.json

@@ -74,14 +74,15 @@
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.18.2",
-    "@eslint/js": "^9.39.4",
-    "@eslint/json": "^0.14.0",
+    "@eslint/js": "^10.0.1",
+    "@eslint/json": "^1.1.0",
     "@types/mdast": "^4.0.4",
     "@types/unist": "^3.0.3",
     "c8": "^11.0.0",
     "dedent": "^1.7.1",
-    "eslint": "^9.39.2",
-    "eslint-config-eslint": "^13.0.0",
+    "eslint": "^10.0.3",
+    "eslint-v9": "npm:eslint@9.x",
+    "eslint-config-eslint": "^14.0.0",
     "eslint-plugin-eslint-plugin": "^7.3.2",
     "globals": "^17.1.0",
     "knip": "^5.82.1",

tests/examples/all.test.js

@@ -35,12 +35,12 @@ for (const example of examples) {
 		describe("examples", () => {
 			describe(example, () => {
 				it("reports errors on code blocks in .md files", async () => {
-					const { FlatESLint } = require(
-						require.resolve("eslint/use-at-your-own-risk", {
+					const { ESLint } = require(
+						require.resolve("eslint", {
 							paths: [cwd],
 						}),
 					);
-					const eslint = new FlatESLint({ cwd });
+					const eslint = new ESLint({ cwd });
 					const results = await eslint.lintFiles(["README.md"]);
 					const readme = results.find(
 						result => path.basename(result.filePath) == "README.md",

tests/plugin.test.js

@@ -8,15 +8,13 @@
 //-----------------------------------------------------------------------------
 
 import assert from "node:assert";
-import api from "eslint";
-import unsupportedAPI from "eslint/use-at-your-own-risk";
 import path from "node:path";
-import plugin from "../src/index.js";
 import fs from "node:fs";
 import { fileURLToPath, pathToFileURL } from "node:url";
+import { ESLint } from "eslint";
+import { LegacyESLint } from "eslint-v9/use-at-your-own-risk";
+import plugin from "../src/index.js";
 
-const ESLint = api.ESLint;
-const LegacyESLint = unsupportedAPI.LegacyESLint;
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
 const rulesDir = path.resolve(__dirname, "../src/rules");
@@ -1582,7 +1580,7 @@ describe("FlatESLint", () => {
 
 		describe("should fix code", () => {
 			before(() => {
-				eslint = initLegacyESLint("eslintrc.json", { fix: true });
+				eslint = initFlatESLint("eslint.config.js", { fix: true });
 			});
 
 			it("in the simplest case", async () => {