Config Jest

- Added Jest config file.
- Set ESLint to ignore Jest config file.
- Config TypeScript to not treat files in `test` folder as part of the source code.

Author: iamWing

.eslintignore

@@ -2,4 +2,5 @@ node_modules
 dist
 out
 public
+jest.config.js
 webpack.config.js

jest.config.js

@@ -0,0 +1,24 @@
+const { pathsToModuleNameMapper } = require('ts-jest')
+const { compilerOptions } = require('./tsconfig.json')
+
+/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+module.exports = config = {
+  testEnvironment: 'node',
+  globals: {
+    'ts-test': {
+      tsconfig: 'tsconfig.json'
+    }
+  },
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
+  moduleNameMapper: pathsToModuleNameMapper(
+    compilerOptions.paths,
+    { prefix: '<rootDir>/' }
+  ),
+  transform: {
+    '^.+\\.(ts|tsx)$': 'ts-jest'
+  },
+  testMatch: [
+    '**/tests/**/*.test.(ts?(x)|js?(x))'
+  ],
+  verbose: true,
+};

test/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true
+  },
+  "include": ["./**/*"]
+}

tsconfig.json

@@ -19,5 +19,5 @@
     "sourceMap": true,
     "target": "esnext"
   },
-  "exclude": ["node_modules"]
+  "include": ["src/**/*"]
 }