Add Typescript boilerplate

LICENSE

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README.md

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-# endorser-push-server
+# node-typescript-boilerplate
+
+[![Sponsor][sponsor-badge]][sponsor]
+[![TypeScript version][ts-badge]][typescript-5-1]
+[![Node.js version][nodejs-badge]][nodejs]
+[![APLv2][license-badge]][license]
+[![Build Status - GitHub Actions][gha-badge]][gha-ci]
+
+👩🏻‍💻 Developer Ready: A comprehensive template. Works out of the box for most [Node.js][nodejs] projects.
+
+🏃🏽 Instant Value: All basic tools included and configured:
+
+- [TypeScript][typescript] [5.1][typescript-5-1]
+- [ESM][esm]
+- [ESLint][eslint] with some initial rules recommendation
+- [Jest][jest] for fast unit testing and code coverage
+- Type definitions for Node.js and Jest
+- [Prettier][prettier] to enforce consistent code style
+- NPM [scripts](#available-scripts) for common operations
+- [EditorConfig][editorconfig] for consistent coding style
+- Reproducible environments thanks to [Volta][volta]
+- Example configuration for [GitHub Actions][gh-actions]
+- Simple example of TypeScript code and unit test
+
+🤲 Free as in speech: available under the APLv2 license.
+
+## Getting Started
+
+This project is intended to be used with the latest Active LTS release of [Node.js][nodejs].
+
+### Use as a repository template
+
+To start, just click the **[Use template][repo-template-action]** link (or the green button). Start adding your code in the `src` and unit tests in the `__tests__` directories.
+
+### Clone repository
+
+To clone the repository, use the following commands:
+
+```sh
+git clone https://github.com/jsynowiec/node-typescript-boilerplate
+cd node-typescript-boilerplate
+npm install
+```
+
+### Download latest release
+
+Download and unzip the current **main** branch or one of the tags:
+
+```sh
+wget https://github.com/jsynowiec/node-typescript-boilerplate/archive/main.zip -O node-typescript-boilerplate.zip
+unzip node-typescript-boilerplate.zip && rm node-typescript-boilerplate.zip
+```
+
+## Available Scripts
+
+- `clean` - remove coverage data, Jest cache and transpiled files,
+- `prebuild` - lint source files and tests before building,
+- `build` - transpile TypeScript to ES6,
+- `build:watch` - interactive watch mode to automatically transpile source files,
+- `lint` - lint source files and tests,
+- `prettier` - reformat files,
+- `test` - run tests,
+- `test:watch` - interactive watch mode to automatically re-run tests
+
+## Additional Information
+
+### Why include Volta
+
+[Volta][volta]’s toolchain always keeps track of where you are, it makes sure the tools you use always respect the settings of the project you’re working on. This means you don’t have to worry about changing the state of your installed software when switching between projects. For example, it's [used by engineers at LinkedIn][volta-tomdale] to standardize tools and have reproducible development environments.
+
+I recommend to [install][volta-getting-started] Volta and use it to manage your project's toolchain.
+
+### ES Modules
+
+This template uses native [ESM][esm]. Make sure to read [this][nodejs-esm], and [this][ts47-esm] first.
+
+If your project requires CommonJS, you will have to [convert to ESM][sindresorhus-esm].
+
+Please do not open issues for questions regarding CommonJS or ESM on this repo.
+
+## Backers & Sponsors
+
+Support this project by becoming a [sponsor][sponsor].
+
+## License
+
+Licensed under the APLv2. See the [LICENSE](https://github.com/jsynowiec/node-typescript-boilerplate/blob/main/LICENSE) file for details.
+
+[ts-badge]: https://img.shields.io/badge/TypeScript-5.1-blue.svg
+[nodejs-badge]: https://img.shields.io/badge/Node.js->=%2018.12-blue.svg
+[nodejs]: https://nodejs.org/dist/latest-v18.x/docs/api/
+[gha-badge]: https://github.com/jsynowiec/node-typescript-boilerplate/actions/workflows/nodejs.yml/badge.svg
+[gha-ci]: https://github.com/jsynowiec/node-typescript-boilerplate/actions/workflows/nodejs.yml
+[typescript]: https://www.typescriptlang.org/
+[typescript-5-1]: https://devblogs.microsoft.com/typescript/announcing-typescript-5-1/
+[license-badge]: https://img.shields.io/badge/license-APLv2-blue.svg
+[license]: https://github.com/jsynowiec/node-typescript-boilerplate/blob/main/LICENSE
+[sponsor-badge]: https://img.shields.io/badge/♥-Sponsor-fc0fb5.svg
+[sponsor]: https://github.com/sponsors/jsynowiec
+[jest]: https://facebook.github.io/jest/
+[eslint]: https://github.com/eslint/eslint
+[wiki-js-tests]: https://github.com/jsynowiec/node-typescript-boilerplate/wiki/Unit-tests-in-plain-JavaScript
+[prettier]: https://prettier.io
+[volta]: https://volta.sh
+[volta-getting-started]: https://docs.volta.sh/guide/getting-started
+[volta-tomdale]: https://twitter.com/tomdale/status/1162017336699838467?s=20
+[gh-actions]: https://github.com/features/actions
+[repo-template-action]: https://github.com/jsynowiec/node-typescript-boilerplate/generate
+[esm]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
+[sindresorhus-esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+[nodejs-esm]: https://nodejs.org/docs/latest-v16.x/api/esm.html
+[ts47-esm]: https://devblogs.microsoft.com/typescript/announcing-typescript-5-1/#esm-nodejs
+[editorconfig]: https://editorconfig.org

__tests__/main.test.ts

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+import { Delays, greeter } from '../src/main.js';
+
+describe('greeter function', () => {
+  const name = 'John';
+  let hello: string;
+
+  let timeoutSpy: jest.SpyInstance;
+
+  // Act before assertions
+  beforeAll(async () => {
+    // Read more about fake timers
+    // http://facebook.github.io/jest/docs/en/timer-mocks.html#content
+    // Jest 27 now uses "modern" implementation of fake timers
+    // https://jestjs.io/blog/2021/05/25/jest-27#flipping-defaults
+    // https://github.com/facebook/jest/pull/5171
+    jest.useFakeTimers();
+    timeoutSpy = jest.spyOn(global, 'setTimeout');
+
+    const p: Promise<string> = greeter(name);
+    jest.runOnlyPendingTimers();
+    hello = await p;
+  });
+
+  // Teardown (cleanup) after assertions
+  afterAll(() => {
+    timeoutSpy.mockRestore();
+  });
+
+  // Assert if setTimeout was called properly
+  it('delays the greeting by 2 seconds', () => {
+    expect(setTimeout).toHaveBeenCalledTimes(1);
+    expect(setTimeout).toHaveBeenLastCalledWith(
+      expect.any(Function),
+      Delays.Long,
+    );
+  });
+
+  // Assert greeter result
+  it('greets a user with `Hello, {name}` message', () => {
+    expect(hello).toBe(`Hello, ${name}`);
+  });
+});

jest.config.js

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+export default {
+  testEnvironment: 'node',
+  preset: 'ts-jest/presets/default-esm',
+  transform: {
+    '^.+\\.m?[tj]s?$': ['ts-jest', { useESM: true }],
+  },
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.(m)?js$': '$1',
+  },
+  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.(m)?ts$',
+  coverageDirectory: 'coverage',
+  collectCoverageFrom: [
+    'src/**/*.ts',
+    'src/**/*.mts',
+    '!src/**/*.d.ts',
+    '!src/**/*.d.mts',
+  ],
+};

package.json

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+{
+  "name": "node-typescript-boilerplate",
+  "version": "0.0.0",
+  "description": "Minimalistic boilerplate to quick-start Node.js development in TypeScript.",
+  "type": "module",
+  "engines": {
+    "node": ">= 18.12 <19"
+  },
+  "devDependencies": {
+    "@types/jest": "~29.5",
+    "@types/node": "~18",
+    "@typescript-eslint/eslint-plugin": "~6.2",
+    "@typescript-eslint/parser": "~6.2",
+    "eslint": "~8.46",
+    "eslint-config-prettier": "~9.0",
+    "eslint-plugin-jest": "~27.2",
+    "jest": "~29.6",
+    "prettier": "~3.0",
+    "rimraf": "~5.0",
+    "ts-api-utils": "~1.0",
+    "ts-jest": "~29.1",
+    "typescript": "~5.1"
+  },
+  "scripts": {
+    "start": "node build/src/main.js",
+    "clean": "rimraf coverage build tmp",
+    "prebuild": "npm run lint",
+    "build": "tsc -p tsconfig.json",
+    "build:watch": "tsc -w -p tsconfig.json",
+    "build:release": "npm run clean && tsc -p tsconfig.release.json",
+    "lint": "eslint . --ext .ts --ext .mts",
+    "test": "jest --coverage",
+    "prettier": "prettier --config .prettierrc --write .",
+    "test:watch": "jest --watch"
+  },
+  "author": "Jakub Synowiec <jsynowiec@users.noreply.github.com>",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "tslib": "~2.6"
+  },
+  "volta": {
+    "node": "18.12.1"
+  }
+}

src/main.ts

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+/**
+ * Some predefined delay values (in milliseconds).
+ */
+export enum Delays {
+  Short = 500,
+  Medium = 2000,
+  Long = 5000,
+}
+
+/**
+ * Returns a Promise<string> that resolves after a given time.
+ *
+ * @param {string} name - A name.
+ * @param {number=} [delay=Delays.Medium] - A number of milliseconds to delay resolution of the Promise.
+ * @returns {Promise<string>}
+ */
+function delayedHello(
+  name: string,
+  delay: number = Delays.Medium,
+): Promise<string> {
+  return new Promise((resolve: (value?: string) => void) =>
+    setTimeout(() => resolve(`Hello, ${name}`), delay),
+  );
+}
+
+// Please see the comment in the .eslintrc.json file about the suppressed rule!
+// Below is an example of how to use ESLint errors suppression. You can read more
+// at https://eslint.org/docs/latest/user-guide/configuring/rules#disabling-rules
+
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+export async function greeter(name: any) { // eslint-disable-line @typescript-eslint/no-explicit-any
+  // The name parameter should be of type string. Any is used only to trigger the rule.
+  return await delayedHello(name, Delays.Long);
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es2022",
+    "module": "node16",
+    "lib": ["ES2022"],
+    "moduleResolution": "node16",
+    "rootDir": ".",
+    "outDir": "build",
+    "allowSyntheticDefaultImports": true,
+    "importHelpers": true,
+    "alwaysStrict": true,
+    "sourceMap": true,
+    "forceConsistentCasingInFileNames": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitAny": false,
+    "noImplicitThis": false,
+    "strictNullChecks": false
+  },
+  "include": ["src/**/*", "__tests__/**/*"]
+}

tsconfig.release.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "sourceMap": false,
+    "removeComments": true
+  },
+  "include": ["src/**/*"]
+}