chore: update TypeScript to v6

.github/workflows/ci.yml

@@ -18,8 +18,6 @@ jobs:
                   node-version: "lts/*"
             - name: Install dependencies
               run: npm install
-            - name: Build packages
-              run: npm run build
             - name: Lint files
               run: npm run lint
             - name: Lint Files, Dependencies, & Exports
@@ -36,8 +34,6 @@ jobs:
                   node-version: lts/*
             - name: Install dependencies
               run: npm install
-            - name: Build packages
-              run: npm run build
             - name: Prettier Check
               run: npm run fmt:check
 
@@ -60,11 +56,42 @@ jobs:
                   node-version: ${{ matrix.node }}
             - name: Install dependencies
               run: npm install
-            - name: Build packages
-              run: npm run build
             - name: Run tests
               run: npm run test
 
+    test_types:
+        name: Test Types
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v6
+
+            - name: Setup Node.js
+              uses: actions/setup-node@v6
+              with:
+                  node-version: "lts/*"
+
+            - name: Install Packages
+              run: npm install
+
+            - name: Test types (eslint-scope)
+              run: npm run test:types -w packages/eslint-scope
+
+            - name: Test types (eslint-visitor-keys)
+              run: npm run test:types -w packages/eslint-visitor-keys
+
+            - name: Test types (espree)
+              run: npm run test:types -w packages/espree
+
+            - name: Check dist types compile (TypeScript 5.3)
+              run: npm run test:types:5.3
+
+            - name: Check dist types compile (TypeScript 5.x)
+              run: npm run test:types:5.x
+
+            - name: Check dist types compile (TypeScript 7 preview)
+              run: npm run test:types:7.x
+
     are-the-types-wrong:
         name: Are the types wrong?
         runs-on: ubuntu-latest
@@ -76,7 +103,5 @@ jobs:
                   node-version: "lts/*"
             - name: Install dependencies
               run: npm install
-            - name: Build types
-              run: npm run build:types
             - name: Are the types wrong?
               run: npm run lint:types

knip.json

@@ -8,7 +8,7 @@
       "entry": ["test-d/**/*.test-d.ts"]
     },
     "packages/espree": {
-      "entry": ["espree.cts", "test-d/**/*.test-d.ts", "tools/**/*.js"],
+      "entry": ["test-d/**/*.test-d.ts", "tools/**/*.js"],
       "ignore": ["tests/fixtures/**"]
     }
   }

package.json

@@ -5,13 +5,19 @@
   "scripts": {
     "build": "npm run build --workspaces --if-present",
     "build:types": "npm run build:types --workspaces --if-present",
+    "prepare": "npm run build",
     "lint": "eslint",
     "lint:fix": "eslint --fix",
     "lint:types": "npm run lint:types --workspaces --if-present",
     "lint:unused": "knip",
     "fmt": "prettier --write .",
     "fmt:check": "prettier --check .",
-    "test": "npm test --workspaces --if-present"
+    "test": "npm test --workspaces --if-present",
+    "test:types": "npm run test:types --workspaces --if-present",
+    "test:types:5.3": "npx -p [email protected] -y -- tsc -p tsconfig.dist-legacy.json",
+    "test:types:5.x": "npx -p [email protected] -y -- tsc -p tsconfig.dist.json",
+    "test:types:7.x": "npx -p @typescript/native-preview@latest -y -- tsgo -p tsconfig.dist.json",
+    "test:types:all": "npm run test:types && npm run test:types:5.3 && npm run test:types:5.x && npm run test:types:7.x"
   },
   "workspaces": [
     "packages/*"
@@ -29,7 +35,7 @@
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.18.2",
     "@types/node": "^20.19.0",
-    "@typescript-eslint/parser": "^8.56.1",
+    "@typescript-eslint/parser": "^8.59.0",
     "c8": "^11.0.0",
     "eslint": "^10.0.3",
     "eslint-config-eslint": "^14.0.0",
@@ -41,7 +47,7 @@
     "mocha": "^11.1.0",
     "prettier": "3.8.3",
     "rollup": "^4.55.2",
-    "typescript": "^5.9.3",
+    "typescript": "^6.0.3",
     "yorkie": "^2.0.0"
   }
 }

packages/eslint-scope/lib/index.d.cts

@@ -216,7 +216,7 @@ export class Scope<
 	 */
 	constructor(
 		scopeManager: ScopeManager,
-		type: typeof this.type,
+		type: Scope["type"],
 		upperScope: Scope | null,
 		block: ESTree.Node,
 		isMethodDefinition: boolean,

packages/eslint-scope/package.json

@@ -55,7 +55,7 @@
     "estraverse": "^5.2.0"
   },
   "devDependencies": {
-    "@typescript-eslint/parser": "^8.7.0",
+    "@typescript-eslint/parser": "^8.59.0",
     "chai": "^6.0.0",
     "eslint": ">=10.0.0-rc.0 <10.0.0 || ^10.0.0",
     "eslint-visitor-keys": "^5.0.1",

packages/eslint-scope/tests/types/cjs-import.test.cts

@@ -7,15 +7,4 @@
 // Imports
 //-----------------------------------------------------------------------------
 
-// Make sure the named exports exist.
-import {
-	Definition,
-	PatternVisitor,
-	Reference,
-	Referencer,
-	ScopeManager,
-	Scope,
-	Variable,
-	analyze,
-	version,
-} from "eslint-scope";
+import "eslint-scope";

packages/eslint-scope/tests/types/tsconfig.json

@@ -1,8 +1,15 @@
 {
   "extends": "../../tsconfig.json",
   "compilerOptions": {
+    "allowJs": false,
     "checkJs": false,
-    "strict": true
+    "noEmit": true,
+    "rootDir": "../..",
+    "noImplicitAny": true,
+    "exactOptionalPropertyTypes": true,
+    "verbatimModuleSyntax": true,
+    "erasableSyntaxOnly": true
   },
-  "include": [".", "../../lib"]
+  "files": [],
+  "include": [".", "../../dist"]
 }

packages/eslint-scope/tsconfig.json

@@ -1,15 +1,9 @@
 {
+  "extends": "../../tsconfig.base.json",
+  "files": ["lib/index.js"],
   "compilerOptions": {
-    "checkJs": true,
-    "exactOptionalPropertyTypes": true,
-    "forceConsistentCasingInFileNames": true,
-    "lib": ["es2022"],
-    "module": "nodenext",
-    "noEmit": true,
-    "noImplicitThis": true,
-    "strictNullChecks": true,
-    "strictFunctionTypes": true,
-    "types": []
-  },
-  "include": ["lib"]
+    "noImplicitAny": false,
+    "rootDir": "lib",
+    "outDir": "dist"
+  }
 }

packages/eslint-visitor-keys/test-d/index.test-d.ts

@@ -1,6 +1,11 @@
 import { expectType, expectAssignable } from "tsd";
 
-import { KEYS, getKeys, unionWith, VisitorKeys } from "../";
+import {
+	KEYS,
+	getKeys,
+	unionWith,
+	VisitorKeys,
+} from "../dist/eslint-visitor-keys.cjs";
 
 const assignmentExpression = {
 	type: "AssignmentExpression",

packages/eslint-visitor-keys/tsconfig.json

@@ -1,20 +1,8 @@
 {
+  "extends": "../../tsconfig.base.json",
+  "files": ["lib/index.js"],
   "compilerOptions": {
-    "lib": ["esnext"],
-    "moduleResolution": "node",
-    "module": "esnext",
-    "resolveJsonModule": true,
-    "allowJs": true,
-    "checkJs": true,
-    "noEmit": false,
-    "declaration": true,
-    "declarationMap": true,
-    "emitDeclarationOnly": true,
-    "strict": true,
-    "exactOptionalPropertyTypes": true,
-    "target": "es6",
+    "rootDir": "lib",
     "outDir": "dist"
-  },
-  "include": ["lib/**/*.js"],
-  "exclude": ["node_modules"]
+  }
 }

packages/espree/package.json

@@ -43,6 +43,7 @@
     "eslint-visitor-keys": "^5.0.1"
   },
   "devDependencies": {
+    "rollup-plugin-dts": "^6.4.1",
     "shelljs": "^0.10.0",
     "tsd": "^0.33.0"
   },
@@ -58,7 +59,7 @@
     "build": "rollup -c rollup.config.js && npm run build:types && node -e \"fs.rmSync('dist/lib', { recursive: true })\"",
     "build:debug": "npm run build -- -m",
     "build:docs": "node tools/sync-docs.js",
-    "build:types": "tsc && tsc -p tsconfig-cjs.json",
+    "build:types": "tsc",
     "lint:types": "attw --pack",
     "pretest": "npm run build",
     "test": "npm run test:types && npm run test:cjs && npm run test:esm",

packages/espree/rollup.config.js

@@ -1,9 +1,22 @@
-export default {
-	input: "espree.js",
-	external: ["acorn", "acorn-jsx", "eslint-visitor-keys"],
-	treeshake: false,
-	output: {
-		file: "dist/espree.cjs",
-		format: "cjs",
+import { dts } from "rollup-plugin-dts";
+
+export default [
+	{
+		input: "espree.js",
+		external: ["acorn", "acorn-jsx", "eslint-visitor-keys"],
+		treeshake: false,
+		output: {
+			file: "dist/espree.cjs",
+			format: "cjs",
+		},
 	},
-};
+	{
+		plugins: [dts()],
+		input: "espree.js",
+		treeshake: false,
+		output: {
+			file: "dist/espree.d.cts",
+			format: "cjs",
+		},
+	},
+];

packages/espree/tsconfig.json

@@ -1,19 +1,7 @@
 {
+  "extends": "../../tsconfig.base.json",
+  "files": ["espree.js"],
   "compilerOptions": {
-    "lib": ["ESNext"],
-    "moduleResolution": "nodenext",
-    "module": "nodenext",
-    "allowJs": true,
-    "checkJs": true,
-    "noEmit": false,
-    "declaration": true,
-    "declarationMap": true,
-    "emitDeclarationOnly": true,
-    "strict": true,
-    "exactOptionalPropertyTypes": true,
-    "target": "es6",
     "outDir": "dist"
-  },
-  "include": ["espree.js", "lib/**/*.js"],
-  "exclude": ["node_modules"]
+  }
 }

tsconfig.base.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "allowImportingTsExtensions": true,
+    "allowJs": true,
+    "checkJs": true,
+    "declaration": true,
+    "declarationMap": true,
+    "emitDeclarationOnly": true,
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "target": "ES2022"
+  }
+}

tsconfig.dist-legacy.json

@@ -0,0 +1,14 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "allowJs": false,
+    "checkJs": false,
+    "emitDeclarationOnly": false,
+    "noEmit": true,
+    "strict": true,
+    "exactOptionalPropertyTypes": true,
+    "verbatimModuleSyntax": true
+    // "erasableSyntaxOnly" is not supported in TypeScript < 5.8.
+  },
+  "include": ["packages/*/dist", "packages/*/tests/types"]
+}

tsconfig.dist.json

@@ -0,0 +1,14 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "allowJs": false,
+    "checkJs": false,
+    "emitDeclarationOnly": false,
+    "noEmit": true,
+    "strict": true,
+    "exactOptionalPropertyTypes": true,
+    "verbatimModuleSyntax": true,
+    "erasableSyntaxOnly": true
+  },
+  "include": ["packages/*/dist", "packages/*/tests/types"]
+}