Initial commit

.gitignore

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+node_modules
+build

jest.config.js

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+module.exports = {
+  testEnvironment: "node",
+  transform: {
+    "^.+.tsx?$": ["ts-jest",{}],
+  },
+  
+};

package.json

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+{
+  "name": "jlc",
+  "version": "1.0.0",
+  "main": "index.js",
+  "author": "Freywar Ulvnaudgari <freywar.ulvnaudgari@gmail.com>",
+  "license": "MIT",
+  "scripts": {
+    "build": "rm -rf build && tsc",
+    "run": "yarn build && node build/index.js",
+    "debug": "yarn build && node --inspect-brk build/index.js",
+    "test": "jest"
+  },
+  "devDependencies": {
+    "@jest/globals": "^29.7.0",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.2.3",
+    "typescript": "^5.5.4"
+  }
+}

src/core.ts

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+export const id = <T>(v: T) => v;

test/core.spec.ts

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+import { describe, expect, test } from '@jest/globals';
+import { id } from '../src/core';
+
+describe('id', () => {
+  test('returns same value', () => {
+    expect(id(null)).toBe(null);
+    expect(id(1)).toBe(1);
+    expect(id(global)).toBe(global);
+  });
+});

tsconfig.json

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+{
+  "compilerOptions": {
+    "outDir": "build",
+    "target": "ES2022",
+    "module": "ES2022",
+    "moduleResolution": "Node",
+    "lib": [
+      "ES2022"
+    ],
+    "noImplicitAny": true,
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
+    "noImplicitThis": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "declaration": false,
+    "sourceMap": true,
+  },
+  "include": [
+    "src/**/*.ts",
+  ],
+}