Trevor Manz manzt

My Minimal TypeScript Monorepo Setup for ESM Libraries

After a deep dive looking up best practices for TypeScript monorepos recently, I couldn't find anything that suited my needs:

Publish individual (typed) packages to NPM with minimal config.
Supports fast unit testing that spans the entire project (e.g., via Vitest)
Ability to have an interactive playground to experiment with the API in a real-time (e.g., via Vite)

Most solutions point to TypeScript project references,

pnpm install
pnpm dev

	country,year,population,gdp_per_capita,life_expectancy,continent
	Afghanistan,1800,3280000,683,28.21,Asia
	Afghanistan,1801,3280000,683,28.2,Asia
	Afghanistan,1802,3280000,683,28.19,Asia
	Afghanistan,1803,3280000,683,28.18,Asia
	Afghanistan,1804,3280000,683,28.17,Asia
	Afghanistan,1805,3280000,683,28.16,Asia
	Afghanistan,1806,3280000,683,28.15,Asia
	Afghanistan,1807,3280000,683,28.14,Asia
	Afghanistan,1808,3280000,683,28.13,Asia

	import anywidget
	import traitlets

	class ExampleWidget(anywidget.AnyWidget):
	_esm = """
	export function render({ model, el }) {
	el.classList.add("custom-widget");
	function valueChanged() {
	el.textContent = model.get("value");
	}

	<!doctype html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<title>Interactive Observable Plot</title>
	<script type="module" src="/main.js"></script>
	</head>
	<style>
	:root {
	font-family: sans-serif;

	type ChromSizes = [name: string, length: number][]

	type ChromName = unknown;

	type TilesetInfo = {};

	type Bam = {
	min_pos: [number];
	max_pos: [number];
	max_zoom: number;

	// @ts-check
	import * as fsp from "node:fs/promises";
	import * as util from "node:util";
	import glob from "glob";

	let matchingReactString = "from 'react'";
	let BLUE = "\u001b[34m";
	let YELLOW = "\u001b[33m";
	let RESET = "\u001b[0m";