Remove unnecessary code (#245)

* Remove unnecessary code

* fix ci

Author: ota-meshi

Diff for: .github/workflows/CI.yml

@@ -40,10 +40,6 @@ jobs:
           - eslint: 9
             node: 'lts/*'
             os: macos-latest
-          # On old ESLint versions
-          - eslint: 8
-            node: 'lts/*'
-            os: ubuntu-latest
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -63,6 +59,30 @@ jobs:
       run: npm run -s build
     - name: Test
       run: npm run -s test:mocha
+  test-for-old-eslint:
+    name: Test
+    strategy:
+      matrix:
+        eslint: [8]
+        node: ['lts/*']
+        os: [ubuntu-latest]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Checkout submodules
+      run: git submodule update --init
+    - name: Install Node.js v${{ matrix.node }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node }}
+    - name: Install Packages
+      run: npm install -f
+    - name: Install ESLint v${{ matrix.eslint }}
+      run: node scripts/ci-install-eslint ${{ matrix.eslint }}
+    - name: Test
+      run: npm run -s test:debug
 
   test-cov:
     name: Test and Send Coverage

Diff for: package.json

@@ -30,7 +30,6 @@
     "@eslint/eslintrc": "^3.2.0",
     "@eslint/js": "^9.19.0",
     "@types/debug": "^4.1.7",
-    "@types/eslint": "^9.6.1",
     "@types/estree": "^1.0.0",
     "@types/lodash": "^4.14.186",
     "@types/mocha": "^9.0.0",

Diff for: src/common/create-require.ts

@@ -1,7 +1,7 @@
 import * as escope from "eslint-scope"
 import { lte } from "semver"
-import { createRequire } from "./create-require"
 import path from "path"
+import { createRequire } from "module"
 
 type ESLintScope = typeof escope & {
     version: string

Diff for: src/common/eslint-scope.ts

@@ -2,9 +2,9 @@ import type { ParserOptions } from "../common/parser-options"
 // @ts-expect-error -- ignore
 import * as dependencyEspree from "espree"
 import { lte } from "semver"
-import { createRequire } from "./create-require"
 import path from "path"
 import type { BasicParserObject } from "./parser-object"
+import { createRequire } from "module"
 
 type Espree = BasicParserObject & {
     latestEcmaVersion: number

Diff for: src/common/espree.ts

@@ -300,10 +300,6 @@ describe("Template AST", () => {
             })
 
             it("should scope in the correct.", () => {
-                const version = require(`eslint/package.json`).version
-                if (!semver.satisfies(version, ">=8")) {
-                    return
-                }
                 const resultPath = path.join(ROOT, `${name}/scope.json`)
                 if (!fs.existsSync(resultPath)) {
                     return