chore: update @eslint/core, add legacy-peer-deps, and use ESLint v10

.npmrc

@@ -1,2 +1,5 @@
 package-lock = false
 install-links = false
+# TODO: We need to keep `legacy-peer-deps` until all sub-dependencies of `eslint-config-eslint` support ESLint v10.
+# Removing it too early could cause `npm install` to fail.
+legacy-peer-deps = true

package.json

@@ -84,15 +84,15 @@
   ],
   "license": "Apache-2.0",
   "dependencies": {
-    "@eslint/core": "^0.17.0",
+    "@eslint/core": "^1.0.0",
     "@eslint/css-tree": "^3.6.8",
     "@eslint/plugin-kit": "^0.5.0"
   },
   "devDependencies": {
     "@eslint/json": "^0.14.0",
     "c8": "^10.1.3",
     "dedent": "^1.5.3",
-    "eslint": "^9.36.0",
+    "eslint": ">=10.0.0-alpha.0 <10.0.0 || ^10.0.0",
     "eslint-config-eslint": "^13.0.0",
     "eslint-plugin-eslint-plugin": "^6.3.2",
     "globals": "^16.5.0",

tests/types/types.test.ts

@@ -1,6 +1,5 @@
 import css, { CSSSourceCode } from "@eslint/css";
-import type { ESLint } from "eslint";
-import type { SourceLocation, SourceRange } from "@eslint/core";
+import type { Plugin, SourceLocation, SourceRange } from "@eslint/core";
 import type {
 	AnPlusB,
 	AtrulePlain,
@@ -55,7 +54,7 @@ import type {
 } from "@eslint/css-tree";
 import type { CSSRuleDefinition, CSSRuleVisitor } from "@eslint/css/types";
 
-css satisfies ESLint.Plugin;
+css satisfies Plugin;
 css.meta.name satisfies string;
 css.meta.version satisfies string;