christopherbauer

export const PerfCheck = (
	originalMethod: Function,
	context: ClassMethodDecoratorContext
) => {
	const methodName = String(context.name);

	function ReplacementMethod(this: any, ...args: any[]) {
		const p1 = performance.now();
		const result = originalMethod.call(this, ...args);
		const p2 = performance.now();

christopherbauer

/**
 * An example decorator that takes no arguments
 * @param originalMethod The target method to decorate
 * @param _context The context type, can be one of ClassMemberDecoratorContext | ClassMethodDecoratorContext | ClassGetterDecoratorContext | ClassSetterDecoratorContext | ClassFieldDecoratorContext | ClassAccessorDecoratorContext. Try the Command+F12 shortcut to look at the documentation!
 * @returns A function that runs the original method but does some other fun stuff!
 */
const MyDecorator = (
	originalMethod: Function,
	_context: ClassMethodDecoratorContext
) => {

christopherbauer

{
	"name": "car-app",
	"version": "1.0.0",
	"description": "",
	"main": "index.js",
	"scripts": {
		"start-ts": "ts-node index.ts",
		"test": "echo \"Error: no test specified\" && exit 1"
	},
	"keywords": [],

christopherbauer

import { Gallons, MPG, NewCar } from "@classlibrary/core-ts";
const gas = 10 as Gallons;
const milesToTheGallon = 15 as MPG;
const car = new NewCar(gas, milesToTheGallon);

car.start();
car.drive(15);
car.drive(35);
car.drive(20);
car.drive(30);

christopherbauer

{
	"compilerOptions": {
		"target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
		"module": "commonjs" /* Specify what module code is generated. */,
		"moduleResolution": "node" /* Specify how TypeScript looks up a file from a given module specifier. */,
		"declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
		"outDir": "./dist" /* Specify an output folder for all emitted files. */,
		"esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,
		"forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
		"strict": true /* Enable all strict type-checking options. */,

christopherbauer

{
	"dependencies": {
		"typescript": "^5.0.4"
	},
	"name": "@classlibrary/core-ts",
	"main": "dist/index.js",
	"types": "dist/index.d.ts",
	"files": [
		"/dist"
	],

christopherbauer

enum States {
	stopped = "stopped",
	running = "running",
}
type Brand<K, T> = K & { __type: T };
export type MPG = Brand<number, "MPG">;
export type Gallons = Brand<number, "Gas">;

export const report = (
	distance: number,

christopherbauer

const { NewCar } = require("@classlibrary/core-js");
const car = new NewCar(10, 10);
car.start();
car.drive(18);
car.drive(26);
car.drive(10);
car.drive(10);
car.drive(30);
car.drive(14);
car.drive(10);

christopherbauer

{
	"name": "@classlibrary/core-js",
	"version": "1.0.0",
	"description": "",
	"source": "src/index.js",
	"main": "dist/index.js",
	"module": "dist/module.js",
	"scripts": {
		"watch": "parcel watch",
		"build": "parcel build",

christopherbauer

export const report = (distance, gas, used, state) => {
	console.log(
		`Distance: ${Math.round(distance)} | Gas Used: ${Math.round(
			used
		)} | Gas Left: ${Math.round(gas)} | Final State: ${state}`
	);
};
export class NewCar {
	constructor(gas, mpg) {
		this.gas = gas;