fix: eslint 7.0 support

.github/workflows/CI.yml

@@ -31,10 +31,9 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        eslint: [8.x, 7.x]
+        eslint: [8.x]
         node: [18.x, 20.x]
         include:
-          # run on node lts(ubuntu-latest)
           - os: ubuntu-latest
             node: "16.0.x"
             eslint: "8.x"
@@ -44,6 +43,9 @@ jobs:
           - os: ubuntu-latest
             node: "19.x"
             eslint: "8.x"
+          - os: ubuntu-latest
+            node: "20.x"
+            eslint: "7.0.x"
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
@@ -57,10 +59,7 @@ jobs:
       - name: Install Packages
         run: npm install
       - name: Install ESLint ${{ matrix.eslint }}
-        # We need to execute this command twice because of npm's bug.
-        # See also: https://npm.community/t/error-node-modules-staging-eslint-e7cf6846-node-modules-eslint
         run: |
-          npm install --no-save eslint@${{ matrix.eslint }}
-          npm install --no-save eslint@${{ matrix.eslint }}
+          npm install --no-save --force eslint@${{ matrix.eslint }}
       - name: Test
         run: npm run -s test:ci

lib/configs/recommended-module.js

@@ -7,9 +7,9 @@ const { commonRules } = require("./_commons")
 module.exports.eslintrc = {
     env: {
         node: true,
-        es2021: true,
     },
     globals: {
+        ...globals.es2021,
         __dirname: "off",
         __filename: "off",
         exports: "off",
@@ -36,7 +36,6 @@ module.exports.flat = {
         sourceType: "module",
         globals: {
             ...globals.node,
-            ...globals.es2021,
             ...module.exports.eslintrc.globals,
         },
     },

lib/configs/recommended-script.js

@@ -7,9 +7,9 @@ const { commonRules } = require("./_commons")
 module.exports.eslintrc = {
     env: {
         node: true,
-        es2021: true,
     },
     globals: {
+        ...globals.es2021,
         __dirname: "readonly",
         __filename: "readonly",
         exports: "writable",
@@ -33,7 +33,6 @@ module.exports.flat = {
         sourceType: "commonjs",
         globals: {
             ...globals.node,
-            ...globals.es2021,
             ...module.exports.eslintrc.globals,
         },
     },

lib/util/is-typescript.js

@@ -12,7 +12,10 @@ const typescriptExtensions = [".ts", ".tsx", ".cts", ".mts"]
  */
 module.exports = function isTypescript(context) {
     const sourceFileExt = path.extname(
-        context.physicalFilename ?? context.getPhysicalFilename()
+        context.physicalFilename ??
+            context.getPhysicalFilename?.() ??
+            context.filename ??
+            context.getFilename?.()
     )
     return typescriptExtensions.includes(sourceFileExt)
 }