Add typescript template project with a dummy function and test

.gitignore

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+node_modules

jest.config.js

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+module.exports = {
+    preset: 'ts-jest',
+    testEnvironment: 'node'
+}

package.json

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+{
+  "name": "typescript-template",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest",
+    "build": "tsc"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/jest": "^26.0.24",
+    "jest": "^27.0.6",
+    "ts-jest": "^27.0.4",
+    "typescript": "^4.3.5"
+  }
+}

src/Dummy.ts

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+export const dummyOutput = (input: string) => {
+    return input + input
+}

test/src/Dummy.test.ts

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+import { dummyOutput } from '../../src/Dummy'
+
+describe("Dummy Test", () => {
+    it("should assert on the dummy output", () => {
+        const dummyOutputReturned = dummyOutput("hello")
+        expect(dummyOutputReturned).toBe("hellohello")
+    })
+})

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": ["es2020"],
+    "sourceMap": true,
+    "outDir": "./dist",
+    "moduleResolution": "node",
+
+    "removeComments": true,
+    "strict": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "strictFunctionTypes": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": false
+  },
+  "exclude": ["node_modules"],
+  "include": ["./src/**/*.ts"]
+}