feat: use tsup to build lib/ (#640)

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## PR Checklist

- [x] Addresses an existing open issue: fixes #632
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/template-typescript-node-package/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/template-typescript-node-package/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Bumps to the latest version of `tsup` to include
egoist/tsup#934.

Adds an `entry` for all non-`test` files in `src/` so that the existing
directory structure is maintained.

Author: JoshuaKGoldberg

.github/DEVELOPMENT.md

@@ -13,13 +13,17 @@ pnpm install
 
 ## Building
 
-Run [TypeScript](https://typescriptlang.org) locally to type check and build source files from `src/` into output files in `lib/`:
+Run [[**tsup**](https://tsup.egoist.dev) locally to build source files from `src/` into output files in `lib/`:
 
 ```shell
-pnpm build --watch
+pnpm build
 ```
 
-You should also see suggestions from TypeScript in your editor.
+Add `--watch` to run the builder in a watch mode that continuously cleans and recreates `lib/` as you save files:
+
+```shell
+pnpm build --watch
+```
 
 ## Formatting
 
@@ -67,6 +71,22 @@ Calls to `console.log`, `console.warn`, and other console methods will cause a t
 This repository includes a [VS Code launch configuration](https://code.visualstudio.com/docs/editor/debugging) for debugging unit tests.
 To launch it, open a test file, then run _Debug Current Test File_ from the VS Code Debug panel (or press F5).
 
+## Type Checking
+
+You should be able to see suggestions from [TypeScript](https://typescriptlang.org) in your editor for all open files.
+
+However, it can be useful to run the TypeScript command-line (`tsc`) to type check all files in `src/`:
+
+```shell
+pnpm tsc
+```
+
+Add `--watch` to keep the type checker running in a watch mode that updates the display as you save files:
+
+```shell
+pnpm tsc --watch
+```
+
 ## The Hydration Script
 
 This template's "hydration" script is located in `src/hydrate/`.

.github/workflows/tsc.yml

@@ -0,0 +1,15 @@
+jobs:
+  type_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/prepare
+      - run: pnpm tsc
+
+name: Type Check
+
+on:
+  pull_request: ~
+  push:
+    branches:
+      - main

README.md

@@ -40,6 +40,7 @@ It sets up the following tooling for you:
 - [**Prettier**](https://prettier.io): Opinionated formatting for code, run on file save and as a Git commit hook via [husky](https://typicode.github.io/husky) and [lint-staged](https://github.com/okonet/lint-staged).
 - [**release-it**](https://github.com/release-it/release-it): Generates changelogs, bumps the package version, and publishes to GitHub and npm based on [conventional commits](https://www.conventionalcommits.org).
 - [**Renovate**](https://docs.renovatebot.com): Keeps dependencies up-to-date with PRs, configured to wait a few days after each update for safety.
+- [**tsup**](https://tsup.egoist.dev): Builds output definitions and JavaScript files using [esbuild](https://esbuild.github.io).
 - [**TypeScript**](https://typescriptlang.org): A typed superset of JavaScript, configured with strict compiler options.
 - [**Vitest**](https://vitest.dev): Fast unit tests, configured with coverage tracking and [console-fail-test](https://github.com/JoshuaKGoldberg/console-fail-test).
 

cspell.json

@@ -23,6 +23,7 @@
 		"outro",
 		"packagejson",
 		"quickstart",
+		"tsup",
 		"Unstaged",
 		"wontfix"
 	]

package.json

@@ -22,7 +22,7 @@
 		"README.md"
 	],
 	"scripts": {
-		"build": "tsc",
+		"build": "tsup",
 		"format": "prettier \"**/*\" --ignore-unknown",
 		"format:write": "pnpm format --write",
 		"hydrate:test": "node script/hydrate-test-e2e.js",
@@ -60,6 +60,7 @@
 		"@types/eslint": "^8.37.0",
 		"@types/git-url-parse": "^9.0.1",
 		"@types/js-yaml": "^4.0.5",
+		"@types/node": "^20.4.8",
 		"@types/prettier": "^2.7.2",
 		"@typescript-eslint/eslint-plugin": "^6.0.0",
 		"@typescript-eslint/parser": "^6.0.0",
@@ -96,6 +97,7 @@
 		"release-it": "^16.0.0",
 		"sentences-per-line": "^0.2.1",
 		"should-semantic-release": "^0.1.1",
+		"tsup": "^7.2.0",
 		"tsx": "^3.12.7",
 		"typescript": "^5.0.4",
 		"vitest": "^0.34.0",