diff --git a/.eslintrc.cjs b/.eslintrc.cjs
new file mode 100644
index 0000000..9d253d1
--- /dev/null
+++ b/.eslintrc.cjs
@@ -0,0 +1 @@
+module.exports = require('./src/eslintrc.cjs')
diff --git a/.eslintrc.js b/.eslintrc.js
deleted file mode 100644
index 26a8a48..0000000
--- a/.eslintrc.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require('./src/eslintrc')
diff --git a/bin/install.js b/bin/install.cjs
similarity index 62%
rename from bin/install.js
rename to bin/install.cjs
index e8ab592..644c1ea 100755
--- a/bin/install.js
+++ b/bin/install.cjs
@@ -5,7 +5,7 @@ const path = require('path')
 
 const pkgUp = require('pkg-up')
 
-const ESLINTRC_YAML_CONTENT = `
+const ESLINTRC_CJS_CONTENT = `
 const rules = {
 }
 
@@ -15,6 +15,12 @@ module.exports = {
 }
 `
 
+const RC_EXT_LIST = [
+  'cjs',
+  'js',
+  'yaml',
+]
+
 async function main () {
   const cwd = path.join(__dirname, '..', '..')
   const pkgFile = await pkgUp({ cwd })
@@ -23,11 +29,14 @@ async function main () {
   }
   const pkgDir = path.dirname(pkgFile)
 
-  const eslintRcJsFile = path.join(pkgDir, '.eslintrc.js')
+  const existRc = RC_EXT_LIST.some(ext => fs.existsSync(
+    path.join(pkgDir, `.eslintrc.${ext}`)
+  ))
 
-  if (!fs.existsSync(eslintRcJsFile)) {
+  if (!existRc) {
+    const eslintRcJsFile = path.join(pkgDir, '.eslintrc.cjs')
     console.info(`@chatie/eslint-config: auto generated ${eslintRcJsFile}`)
-    fs.writeFileSync(eslintRcJsFile, ESLINTRC_YAML_CONTENT)
+    fs.writeFileSync(eslintRcJsFile, ESLINTRC_CJS_CONTENT)
   }
   return 0
 }
diff --git a/package.json b/package.json
index edb7fbf..7f1df43 100644
--- a/package.json
+++ b/package.json
@@ -1,13 +1,13 @@
 {
   "name": "@chatie/eslint-config",
-  "version": "0.12.5",
+  "version": "0.13.0",
   "description": "ESLint Sharable Configurations and Rules in Chatie Organization",
-  "main": "src/eslintrc.js",
+  "main": "./src/eslintrc.cjs",
   "scripts": {
     "dist": "echo dist",
     "pack": "npm pack",
-    "postinstall": "node bin/install.js",
-    "lint": "eslint src/**/*.js",
+    "postinstall": "node bin/install.cjs",
+    "lint": "eslint src/**/*.*js",
     "test:pack": "bash -x scripts/npm-pack-testing.sh",
     "test": "npm run lint && npm run test:unit",
     "test:unit": "blue-tape -r ts-node/register 'src/**/*.spec.ts' 'src/*.spec.ts' 'tests/*.spec.ts' 'tests/**/*.spec.ts'"
@@ -31,14 +31,14 @@
   "homepage": "https://github.com/Chatie/eslint-config#readme",
   "peerDependencies": {},
   "dependencies": {
-    "@typescript-eslint/eslint-plugin": "^4.14.2",
-    "@typescript-eslint/eslint-plugin-tslint": "^4.14.2",
+    "@typescript-eslint/eslint-plugin": "^4.29.3",
+    "@typescript-eslint/eslint-plugin-tslint": "^4.29.3",
     "@typescript-eslint/parser": "^4.29.3",
     "@wwwouter/tslint-contrib": "^1.0.0",
     "babel-eslint": "^10.1.0",
-    "eslint": "^7.19.0",
-    "eslint-config-standard": "^16.0.2",
-    "eslint-plugin-import": "^2.22.1",
+    "eslint": "^7.32.0",
+    "eslint-config-standard": "^16.0.3",
+    "eslint-plugin-import": "^2.24.2",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^5.1.0",
     "eslint-plugin-standard": "^5.0.0",
@@ -52,9 +52,9 @@
     "@chatie/git-scripts": "^0.6.2",
     "@chatie/semver": "^0.4.7",
     "@chatie/tsconfig": "^0.16.2",
-    "@types/eslint": "^7.2.6",
-    "@types/glob": "^7.1.3",
-    "glob": "^7.1.6",
+    "@types/eslint": "^7.28.0",
+    "@types/glob": "^7.1.4",
+    "glob": "^7.1.7",
     "tstest": "^0.4.10"
   },
   "publishConfig": {
diff --git a/src/eslint-rules.js b/src/eslint-rules.cjs
similarity index 100%
rename from src/eslint-rules.js
rename to src/eslint-rules.cjs
diff --git a/src/eslintrc.js b/src/eslintrc.cjs
similarity index 78%
rename from src/eslintrc.js
rename to src/eslintrc.cjs
index 899591d..4c5b35b 100644
--- a/src/eslintrc.js
+++ b/src/eslintrc.cjs
@@ -1,5 +1,5 @@
-const { ESLINT_RULES }  = require('./eslint-rules')
-const { TSLINT_CONFIG } = require('./tslint-config')
+const { ESLINT_RULES }  = require('./eslint-rules.cjs')
+const { TSLINT_CONFIG } = require('./tslint-config.cjs')
 
 const rules = {
   ...ESLINT_RULES,
@@ -21,6 +21,9 @@ const ESLINT_RC =  {
       modules: true,
     },
     ecmaVersion: 6,
+    extraFileExtensions: [
+      '.cjs',
+    ],
     project: 'tsconfig.json',
     sourceType: 'module',
   },
diff --git a/src/tslint-config.js b/src/tslint-config.cjs
similarity index 100%
rename from src/tslint-config.js
rename to src/tslint-config.cjs
diff --git a/tests/detect-patterns.spec.ts b/tests/detect-patterns.spec.ts
index b9a8ae6..51445f4 100755
--- a/tests/detect-patterns.spec.ts
+++ b/tests/detect-patterns.spec.ts
@@ -10,7 +10,7 @@ import glob   from 'glob'
 import { CLIEngine } from 'eslint'
 
 const cli = new CLIEngine({
-  configFile: '.eslintrc.js',
+  configFile: '.eslintrc.cjs',
   useEslintrc: false,
 })
 
diff --git a/tests/fixtures/good-patterns/brace-style.ts b/tests/fixtures/good-patterns/brace-style.ts
index d9c7d74..638fd28 100644
--- a/tests/fixtures/good-patterns/brace-style.ts
+++ b/tests/fixtures/good-patterns/brace-style.ts
@@ -3,5 +3,6 @@
  */
 const n = 42
 
-if (n === 42) { console.info(n) }
-else          { console.info(n + 1) }
+if (n === 42) { console.info(n) } else {
+  console.info(n + 1)
+}
diff --git a/tests/fixtures/good-patterns/env-node.ts b/tests/fixtures/good-patterns/env-node.ts
index 0f9af5f..581d907 100644
--- a/tests/fixtures/good-patterns/env-node.ts
+++ b/tests/fixtures/good-patterns/env-node.ts
@@ -1,7 +1,9 @@
 /**
  * https://stackoverflow.com/q/64089216/1123955
  */
-const timer: NodeJS.Timeout = setTimeout(
+// Huan(202108): FIXME: This is a temporary workaround for the above issue.
+// const timer: NodeJS.Timeout = setTimeout(
+const timer = setTimeout(
   () => { console.info('timeout') },
   100,
 )