test: migrate config file to TypeScript (#324)

Author: nogic1008

.eslintrc.json

@@ -8,6 +8,7 @@
   "plugins": ["jest", "simple-import-sort"],
   "settings": {
     "node": {
+      "allowModules": ["@jest/types"],
       "tryExtensions": [".ts", ".js", ".json", ".node"]
     }
   },

jest.config.js jest.config.ts

@@ -1,5 +1,6 @@
-/** @type {import('@jest/types/build/Config').InitialOptions} */
-module.exports = {
+import type { Config } from '@jest/types'
+
+const config: Config.InitialOptions = {
   clearMocks: true,
   moduleFileExtensions: ['js', 'ts'],
   testEnvironment: 'node',
@@ -11,3 +12,4 @@ module.exports = {
   collectCoverage: true,
   collectCoverageFrom: ['<rootDir>/src/**/*.ts']
 }
+export default config

package.json

@@ -62,6 +62,7 @@
     "npm-run-all": "^4.1.5",
     "prettier": "^2.1.2",
     "ts-jest": "^26.4.3",
+    "ts-node": "^9.0.0",
     "typescript": "^4.0.5"
   }
 }

tsconfig.json

@@ -8,6 +8,6 @@
     "noImplicitAny": true,
     "esModuleInterop": true
   },
-  "exclude": ["node_modules", "__tests__"],
+  "exclude": ["node_modules", "__tests__", "jest.config.ts"],
   "types": ["jest", "js-yaml", "node"]
 }