chore(tests): add Jest and initial setup

.eslintrc.json

@@ -1,16 +1,32 @@
 {
   "root": true,
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-    "project": ["./tsconfig.json"]
-  },
-  "plugins": ["@typescript-eslint", "import"],
-  "extends": [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended",
-    "plugin:@typescript-eslint/recommended-requiring-type-checking",
-    "plugin:import/recommended",
-    "plugin:import/typescript",
-    "prettier"
+  "overrides": [
+    {
+      "files": ["*.js"],
+      "env": {
+        "node": true
+      },
+      "extends": ["eslint:recommended", "plugin:import/recommended", "prettier"]
+    },
+    {
+      "files": ["*.ts"],
+      "env": {
+        "browser": true,
+        "node": true
+      },
+      "parser": "@typescript-eslint/parser",
+      "parserOptions": {
+        "project": ["./tsconfig.json", "./tsconfig.spec.json"]
+      },
+      "plugins": ["@typescript-eslint", "import"],
+      "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:@typescript-eslint/recommended-requiring-type-checking",
+        "plugin:import/recommended",
+        "plugin:import/typescript",
+        "prettier"
+      ]
+    }
   ]
 }

jest.config.js

@@ -0,0 +1,17 @@
+/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+
+const { pathsToModuleNameMapper } = require('ts-jest');
+const { compilerOptions } = require('./tsconfig.json');
+
+module.exports = {
+  preset: 'ts-jest/presets/default-esm',
+  extensionsToTreatAsEsm: ['.ts'],
+  globals: {
+    'ts-jest': {
+      tsconfig: 'tsconfig.spec.json',
+      useESM: true,
+    },
+  },
+  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths /*, { prefix: '<rootDir>/' } */),
+  testEnvironment: 'node',
+};

package.json

@@ -20,9 +20,10 @@
     "build": "tsc",
     "commit": "git-cz",
     "preinstall": "npx -y only-allow pnpm",
-    "lint": "tsc --noEmit -p . && eslint . && prettier --check .",
+    "lint": "tsc --noEmit -p . && tsc --noEmit -p tsconfig.spec.json && eslint . && prettier --check .",
     "prepare": "husky install",
-    "semantic-release": "semantic-release"
+    "semantic-release": "semantic-release",
+    "test": "jest"
   },
   "config": {
     "commitizen": {
@@ -34,6 +35,8 @@
     "@commitlint/config-conventional": "^16.2.4",
     "@commitlint/cz-commitlint": "^16.2.4",
     "@prettier/plugin-xml": "^2.1.0",
+    "@types/jest": "^27.5.0",
+    "@types/node": "16",
     "@typescript-eslint/eslint-plugin": "^5.22.0",
     "@typescript-eslint/parser": "^5.22.0",
     "commitizen": "^4.2.4",
@@ -43,11 +46,14 @@
     "eslint-plugin-import": "^2.26.0",
     "husky": "^7.0.0",
     "inquirer": "^8.2.4",
+    "jest": "^28.1.0",
     "lint-staged": "^12.4.1",
     "prettier": "^2.6.2",
     "prettier-plugin-packagejson": "^2.2.17",
     "pretty-quick": "^3.1.3",
     "semantic-release": "^19.0.2",
+    "ts-jest": "^28.0.1",
+    "ts-node": "^10.7.0",
     "typescript": "^4.6.4"
   },
   "engines": {