51 changed files with 3011 additions and 4549 deletions
--- a/.editorconfig
+++ b/.editorconfig
@ -6,3 +6,4 @@ indent_size = 4
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+end_of_line = lf
--- a/.eslintignore
+++ b/.eslintignore
@ -1 +0,0 @@
-node_modules
--- a/.eslintrc
+++ b/.eslintrc
@ -1,23 +0,0 @@
-{
-    "root": true,
-    "parser": "@typescript-eslint/parser",
-    "plugins": ["@typescript-eslint", "prettier"],
-    "extends": [
-        "eslint:recommended",
-        "plugin:@typescript-eslint/eslint-recommended",
-        "plugin:@typescript-eslint/recommended",
-        "plugin:react/recommended",
-        "plugin:prettier/recommended"
-    ],
-    "settings": {
-        "react": {
-            "pragma": "createElement"
-        }
-    },
-    "rules": {
-        "@typescript-eslint/no-namespace": "off",
-        "@typescript-eslint/ban-types": "off",
-        "react/prop-types": "off",
-        "react/jsx-key": "off"
-    }
-}
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@ -0,0 +1,38 @@
+name: CI
+
+on:
+    push:
+        branches: [main]
+    pull_request:
+        branches: [main]
+    workflow_dispatch:
+
+jobs:
+    check:
+        runs-on: node-24
+        steps:
+            - uses: https://code.forgejo.org/actions/checkout@v4
+            - name: Cache npm dependencies
+              uses: https://code.forgejo.org/actions/cache@v4
+              with:
+                path: ~/.npm
+                key: node-24-${{ hashFiles('**/package-lock.json') }}
+            - run: npm ci
+            - run: npm run check
+
+    build:
+        needs: check
+        strategy:
+            matrix:
+                node: [22, 24]
+        runs-on: node-${{ matrix.node }}
+        steps:
+            - uses: https://code.forgejo.org/actions/checkout@v4
+            - name: Cache npm dependencies
+              uses: https://code.forgejo.org/actions/cache@v4
+              with:
+                path: ~/.npm
+                key: node-${{ matrix.node }}-${{ hashFiles('**/package-lock.json') }}
+            - run: npm ci
+            - run: npm run build
+            - run: npm test
--- a/.gitattributes
+++ b/.gitattributes
@ -0,0 +1,2 @@
+# Ensure that git uses lf line-endings for text files.
+* text=auto eol=lf
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,4 @@
 /dist
+/.temp
 public/
 node_modules/
--- a/.nvmrc
+++ b/.nvmrc
@ -1 +1 @@
-lts/erbium
+18
--- a/.travis.yml
+++ b/.travis.yml
@ -1,9 +0,0 @@
-language: node_js
-node_js:
-    - node
-    - lts/*
-    - 14
-    - 13
-    - 12
-    - 11
-    - 10
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -1,5 +1,28 @@
 # Changelog

+## [0.2.0](https://github.com/websnacksjs/websnacks/releases/tag/v0.2.0) (2021-02-28)
+
+### Features
+
+-   add dangerouslySetInnerHTML attr ([#15](https://github.com/websnacksjs/websnacks/issues/15), [3f356dd](https://github.com/websnacksjs/websnacks/commit/3f356ddfeeb38e8a60c32d26c3e9e8715d0246c3))
+
+### Misc
+
+-   **BREAKING CHANGE** update node-watch optional dep to major v0.7.1
+
+## [0.1.5](https://github.com/websnacksjs/websnacks/releases/tag/v0.1.5) (2020-06-14)
+
+### Bugfixes
+
+-   stack size exceed error on purging module cache ([32eee9b](https://github.com/websnacksjs/websnacks/commit/32eee9b2e04475452905e3478f0fa2a21ad3ccf4))
+
+## [0.1.4](https://github.com/websnacksjs/websnacks/releases/tag/v0.1.4) (2020-06-10)
+
+### Bugfixes
+
+-   dev cmd didn't watch files due to import mangling ([4e44d83](https://github.com/websnacksjs/websnacks/commit/4e44d8369451e19af616a8c03c2ff7f4065b3f50))
+-   dont require config file ([5520bb3](https://github.com/websnacksjs/websnacks/commit/5520bb3571189726df73a2945d9a6e7f5671e7ff))
+
 ## [0.1.3](https://github.com/websnacksjs/websnacks/releases/tag/v0.1.3) (2020-06-04)

 ### Features
--- a/README.md
+++ b/README.md
@ -1,20 +1,9 @@
 # websnacks: Minimal Dependency Server-Side JSX for Static Sites

-<div>
-
-[![NPM release](https://img.shields.io/npm/v/@websnacksjs/websnacks)](https://www.npmjs.com/package/@websnacksjs/websnacks "NPM release")
-[![NPM](https://img.shields.io/npm/l/@websnacksjs/websnacks)](https://www.mozilla.org/en-US/MPL/2.0/FAQ/ "License info")
-[![Build status](https://img.shields.io/travis/websnacksjs/websnacks?style=flat-square)](https://travis-ci.org/websnacksjs/websnacks "Build status for master branch")
-
-</div>
-
-<div>
-
-[![Dependency status](https://img.shields.io/david/websnacksjs/websnacks?style=flat-square)](https://david-dm.org/websnacksjs/websnacks "Dependency status")
-[![Optional dependency status](https://img.shields.io/david/optional/websnacksjs/websnacks?style=flat-square)](https://david-dm.org/websnacksjs/websnacks?type=optional "Optional dependency status")
-[![Dev dependency status](https://img.shields.io/david/dev/websnacksjs/websnacks?style=flat-square)](https://david-dm.org/websnacksjs/websnacks?type=dev "Dev dependency status")
-
-</div>
+[![NPM release](https://badges.git.theinnerlimit.ch/npm/v/@websnacksjs/websnacks?style=flat-square)](https://www.npmjs.com/package/@websnacksjs/websnacks "NPM release")
+[![NPM](https://badges.git.theinnerlimit.ch/npm/l/@websnacksjs/websnacks?style=flat-square)](https://www.mozilla.org/en-US/MPL/2.0/FAQ/ "License info")
+[![Build status](https://git.theinnerlimit.ch/websnacksjs/websnacks/badges/workflows/ci.yml/badge.svg?event=push&label=ci&style=flat-square)](https://git.theinnerlimit.ch/websnacksjs/websnacks/actions?workflow=ci.yml "CI status for main branch")
+![Dependency status](https://badges.git.theinnerlimit.ch/librariesio/release/npm/%40websnacksjs%2Fwebsnacks?style=flat-square)

 Develop fully static websites using typesafe JSX templates on the server without the complex build system and dependency management of server-side rendered React frameworks.

--- a/biome.json
+++ b/biome.json
@ -0,0 +1,41 @@
+{
+	"$schema": "https://biomejs.dev/schemas/2.4.14/schema.json",
+	"files": {
+		"includes": ["**", "!dist", "!node_modules", "!.temp"]
+	},
+	"assist": {
+		"enabled": true,
+		"actions": {
+			"source": {
+				"organizeImports": "on"
+			}
+		}
+	},
+	"formatter": {
+		"enabled": true
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true,
+			"style": {
+				"useShorthandFunctionType": "off"
+			},
+			"correctness": {
+				"useJsxKeyInIterable": "off"
+			}
+		}
+	},
+	"overrides": [
+		{
+			"includes": ["test/**"],
+			"linter": {
+				"rules": {
+					"a11y": {
+						"useHtmlLang": "off"
+					}
+				}
+			}
+		}
+	]
+}
--- a/examples/personal-site/components/header.tsx
+++ b/examples/personal-site/components/header.tsx
@ -1,5 +1,9 @@
 import { stylesheet } from "typestyle";
-import { Component, createElement } from "websnacks";
+import {
+	type Component,
+	// biome-ignore lint/correctness/noUnusedImports: required to support JSX
+	createElement,
+} from "websnacks";

 const styles = stylesheet({
 	header: {
--- a/examples/personal-site/components/layout.tsx
+++ b/examples/personal-site/components/layout.tsx
@ -1,6 +1,10 @@
 import { normalize } from "csstips";
 import { stylesheet } from "typestyle";
-import { Component, createElement } from "websnacks";
+import {
+	type Component,
+	// biome-ignore lint/correctness/noUnusedImports: required to support JSX
+	createElement,
+} from "websnacks";

 import { stylesheetPath } from "../config";
 import { Header } from "./header";
@ -46,10 +50,7 @@ export const Layout: Component<LayoutProps> = ({ children, headline }) => (
 				{headline && ` | ${headline}`}
 			</title>
 			<meta name="description" content="" />
-            <meta
-                name="viewport"
-                content="width=device-width, initial-scale=1"
-            />
+			<meta name="viewport" content="width=device-width, initial-scale=1" />
 			<link rel="stylesheet" href={stylesheetPath} />
 		</head>

--- a/examples/personal-site/components/navbar.tsx
+++ b/examples/personal-site/components/navbar.tsx
@ -1,5 +1,9 @@
 import { stylesheet } from "typestyle";
-import { Component, createElement } from "websnacks";
+import {
+	type Component,
+	// biome-ignore lint/correctness/noUnusedImports: required to support JSX
+	createElement,
+} from "websnacks";

 const styles = stylesheet({
 	navbar: {
--- a/examples/personal-site/package-lock.json
+++ b/examples/personal-site/package-lock.json
--- a/examples/personal-site/package.json
+++ b/examples/personal-site/package.json
@ -1,5 +1,6 @@
 {
 	"name": "websnacks-example-personal-site",
+	"type": "module",
 	"scripts": {
 		"build": "websnacks -r ts-node/register build",
 		"dev": "websnacks -r ts-node/register dev"
--- a/examples/personal-site/pages/index.tsx
+++ b/examples/personal-site/pages/index.tsx
@ -1,22 +1,25 @@
-import { Component, createElement } from "websnacks";
+import {
+	type Component,
+	// biome-ignore lint/correctness/noUnusedImports: required to support JSX
+	createElement,
+} from "websnacks";

 import { Layout } from "../components/layout";

 export const page: Component = () => (
 	<Layout>
 		<p>
-            Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur
-            dapibus condimentum mauris et egestas. Quisque orci nulla, consequat
-            at erat laoreet, malesuada sodales nisi. Sed in lorem semper lorem
-            placerat fermentum a id arcu. Curabitur non aliquam tellus, sed
-            auctor lacus. Nunc sit amet lectus ultrices, sodales nisl sit amet,
-            luctus nisl. Nunc mollis imperdiet quam, eget sollicitudin leo
-            tincidunt vel. Duis felis dui, imperdiet aliquam bibendum sed,
-            auctor et dolor. Vivamus odio ipsum, venenatis in felis sed, aliquam
-            dictum turpis. Pellentesque pellentesque consequat neque, id
-            imperdiet diam molestie nec. Nullam ut vestibulum est. Pellentesque
-            orci urna, porta vel porta quis, semper ut enim. Donec sit amet urna
-            arcu. Nam tincidunt fermentum ligula a pharetra.{" "}
+			Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur dapibus
+			condimentum mauris et egestas. Quisque orci nulla, consequat at erat
+			laoreet, malesuada sodales nisi. Sed in lorem semper lorem placerat
+			fermentum a id arcu. Curabitur non aliquam tellus, sed auctor lacus. Nunc
+			sit amet lectus ultrices, sodales nisl sit amet, luctus nisl. Nunc mollis
+			imperdiet quam, eget sollicitudin leo tincidunt vel. Duis felis dui,
+			imperdiet aliquam bibendum sed, auctor et dolor. Vivamus odio ipsum,
+			venenatis in felis sed, aliquam dictum turpis. Pellentesque pellentesque
+			consequat neque, id imperdiet diam molestie nec. Nullam ut vestibulum est.
+			Pellentesque orci urna, porta vel porta quis, semper ut enim. Donec sit
+			amet urna arcu. Nam tincidunt fermentum ligula a pharetra.{" "}
 		</p>
 	</Layout>
 );
--- a/examples/personal-site/pages/projects.tsx
+++ b/examples/personal-site/pages/projects.tsx
@ -1,5 +1,9 @@
 import { stylesheet } from "typestyle";
-import { Component, createElement } from "websnacks";
+import {
+	type Component,
+	// biome-ignore lint/correctness/noUnusedImports: required to support JSX
+	createElement,
+} from "websnacks";

 import { Layout } from "../components/layout";

--- a/examples/personal-site/websnacks.ts
+++ b/examples/personal-site/websnacks.ts
@ -1,10 +1,10 @@
-import { promises as fs } from "fs";
-import * as path from "path";
-import { Config } from "websnacks";
+import { promises as fs } from "node:fs";
+import * as path from "node:path";
+import type { Config } from "websnacks";

 import { stylesheetPath } from "./config";

-const config: Config = {
+const _config: Config = {
 	// Watch additional files and folders for changes when the dev server is
 	// running.
 	watch: ["components/", "config.ts"],
@ -23,4 +23,3 @@ const config: Config = {
 		},
 	},
 };
-export = config;
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@ -1,14 +1,15 @@
 {
 	"name": "@websnacksjs/websnacks",
 	"description": "Minimal dependency server-side JSX for static sites",
-    "version": "0.1.3",
+	"version": "0.2.0",
 	"author": {
 		"name": "M. George Hansen",
 		"email": "mgeorge@technopolitica.com"
 	},
 	"license": "MPL-2.0",
+	"repository": "github:websnacksjs/websnacks",
 	"engines": {
-        "node": ">=10"
+		"node": ">=18"
 	},
 	"main": "dist/index.js",
 	"types": "types.d.ts",
@ -23,29 +24,26 @@
 	],
 	"scripts": {
 		"build": "tsc",
+		"check": "biome check .",
 		"clean": "ts-node scripts/clean.ts",
 		"prepublishOnly": "npm run reset && npm test",
 		"pretest": "npm run build",
 		"preversion": "npm run reset && npm test",
 		"release": "npm version",
 		"reset": "npm run clean && npm ci",
-        "test": "ts-node --project=test/tsconfig.json test/run-tests.ts"
+		"test": "npm run test:unit && npm run test:e2e",
+		"test:unit": "cd test && ts-node --script-mode ./run-tests.ts",
+		"test:e2e": "cd test && ts-node --script-mode ./run-e2e.ts"
 	},
 	"devDependencies": {
-        "@types/node": "~10",
-        "@types/ws": "^7.2.4",
-        "@typescript-eslint/eslint-plugin": "^3.0.2",
-        "@typescript-eslint/parser": "^3.0.2",
-        "eslint": "^7.1.0",
-        "eslint-config-prettier": "^6.11.0",
-        "eslint-plugin-prettier": "^3.1.3",
-        "eslint-plugin-react": "^7.20.0",
-        "prettier": "^2.0.5",
-        "ts-node": "^8.10.2",
-        "typescript": "~3.9.3"
+		"@biomejs/biome": "2.4.14",
+		"@types/node": "~18",
+		"@types/ws": "^8.18.1",
+		"ts-node": "^10.9.2",
+		"typescript": "~4.9.5"
 	},
 	"optionalDependencies": {
-        "node-watch": "^0.6.4",
-        "ws": "^7.3.0"
+		"node-watch": "^0.7.4",
+		"ws": "^8.20.0"
 	}
 }
--- a/scripts/clean.ts
+++ b/scripts/clean.ts
@ -3,11 +3,12 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import * as fs from "fs";
-import * as path from "path";
+import * as fs from "node:fs";
+import * as path from "node:path";

 const ROOT_DIR = path.resolve(__dirname, "..");
 const DIST_DIR = path.join(ROOT_DIR, "dist");
+const TEST_DIR = path.join(ROOT_DIR, ".temp");

 const rmdirRecursive = (dirPath: string): void => {
 	if (!fs.existsSync(dirPath)) {
@ -27,3 +28,4 @@ const rmdirRecursive = (dirPath: string): void => {
 };

 rmdirRecursive(DIST_DIR);
+rmdirRecursive(TEST_DIR);
--- a/src/build.ts
+++ b/src/build.ts
@ -3,12 +3,12 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { promises as fs } from "fs";
-import * as path from "path";
+import { promises as fs } from "node:fs";
+import * as path from "node:path";

-import { Config, ConfigPaths } from "./config";
+import type { Config, ConfigPaths } from "./config";
 import { renderPage } from "./render";
-import { purgeModuleAndDepsFromCache, walkDir } from "./utils";
+import { decacheModule, walkDir } from "./utils";

 const renderPagesToHtml = async ({
 	pagesDir,
@ -22,21 +22,19 @@ const renderPagesToHtml = async ({
 		}

 		// Ensure that we don't cache page modules when running in dev server.
-        purgeModuleAndDepsFromCache(srcPath);
+		decacheModule(srcPath);
 		// eslint-disable-next-line @typescript-eslint/no-var-requires
 		const pageSrc = require(srcPath);
 		if (!("page" in pageSrc)) {
 			throw new Error(
-                `page source at ${srcPath} does not export a "page" variable`
+				`page source at ${srcPath} does not export a "page" variable`,
 			);
 		}
-        let compiledHtml;
+		let compiledHtml: string;
 		try {
 			compiledHtml = renderPage(pageSrc.page());
 		} catch (error) {
-            throw new Error(
-                `failed to compile ${srcPath}: ${error.stack ?? error}`
-            );
+			throw new Error(`failed to compile ${srcPath}: ${error}`);
 		}
 		const relPath = path.relative(pagesDir, path.dirname(srcPath));
 		let baseName = path.basename(srcPath, ".tsx");
@ -48,7 +46,7 @@ const renderPagesToHtml = async ({
 			(async () => {
 				await fs.mkdir(path.dirname(destPath), { recursive: true });
 				await fs.writeFile(destPath, compiledHtml);
-            })()
+			})(),
 		);
 	}
 	await Promise.all(deferred);
@ -60,7 +58,7 @@ const copyStaticAssets = async ({
 }: ConfigPaths): Promise<void> => {
 	try {
 		await fs.access(staticAssetsDir);
-    } catch (error) {
+	} catch (_error) {
 		// Static assets folder doesn't exist, so no-op.
 		return;
 	}
@ -73,7 +71,7 @@ const copyStaticAssets = async ({
 			(async () => {
 				await fs.mkdir(path.dirname(destPath), { recursive: true });
 				await fs.copyFile(assetPath, destPath);
-            })()
+			})(),
 		);
 	}
 	await Promise.all(deferred);
--- a/src/cli/commands/build.ts
+++ b/src/cli/commands/build.ts
@ -5,7 +5,7 @@

 import { renderSite } from "../../build";
 import { loadConfig } from "../../config";
-import { Command, UsageError } from "../types";
+import { type Command, UsageError } from "../types";

 const helpText = `\
 Usage: websnacks build [ROOT_DIR]
--- a/src/cli/commands/dev.ts
+++ b/src/cli/commands/dev.ts
@ -3,33 +3,34 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { existsSync, promises as fs, watch } from "fs";
-import * as http from "http";
-import * as path from "path";
+import { existsSync, promises as fs, watch } from "node:fs";
+import * as http from "node:http";
+import * as path from "node:path";

 import { renderSite } from "../../build";
-import { Config, loadConfig } from "../../config";
-import { Command, UsageError } from "../types";
+import { type Config, loadConfig } from "../../config";
+import { isErrnoException } from "../../utils/error";
+import { type Command, UsageError } from "../types";

-const SERVER_PORT = 8080;
+const DEFAULT_SERVER_PORT = 8080;

-const injectLiveReloadScript = (htmlContents: string): string =>
+const injectLiveReloadScript = (htmlContents: string, port: number): string =>
 	htmlContents.replace(
 		"</html>",
 		`
        <script>
-            const ws = new WebSocket("ws://127.0.0.1:${SERVER_PORT}");
+            const ws = new WebSocket("ws://127.0.0.1:${port}");
            ws.onmessage = function() {
                console.log('dev server requested reload, reloading...');
                location.reload();
            };
        </script>
        </html>
-    `
+    `,
 	);

 const guessMimeType = (ext: string): string => {
-    let mimeType;
+	let mimeType: string;
 	switch (ext) {
 		case ".apng":
 			mimeType = "image/apng";
@ -118,8 +119,23 @@ const guessMimeType = (ext: string): string => {
 	return mimeType;
 };

-const serve = (publicDir: string): http.Server => {
-    const server = http.createServer(async (req, res) => {
+const portFromServer = (
+	addrInfo: { port: number } | object | string | undefined | null,
+): number => {
+	if (
+		typeof addrInfo !== "object" ||
+		addrInfo == null ||
+		!("port" in addrInfo)
+	) {
+		throw new Error(
+			"server address does not have a valid port (this should never happen!)",
+		);
+	}
+	return addrInfo.port;
+};
+
+const startHttpServer = async (publicDir: string): Promise<http.Server> => {
+	const httpServer = http.createServer(async (req, res) => {
 		if (req.url == null) {
 			res.writeHead(404);
 			res.end();
@ -133,10 +149,10 @@ const serve = (publicDir: string): http.Server => {
 			reqExt = ".html";
 		}

-        let contents;
+		let contents: Buffer | string;
 		try {
 			contents = await fs.readFile(path.join(publicDir, reqPath));
-        } catch (error) {
+		} catch (_error) {
 			console.error(`unable to load file ${reqPath}`);
 			res.writeHead(404);
 			res.end();
@ -144,31 +160,57 @@ const serve = (publicDir: string): http.Server => {
 		}
 		const mimeType = guessMimeType(reqExt);
 		if (mimeType === "text/html") {
-            contents = injectLiveReloadScript(contents.toString("utf8"));
+			const port = portFromServer(req.socket.address());
+			contents = injectLiveReloadScript(contents.toString("utf8"), port);
 		}
 		res.writeHead(200, {
 			"Content-Type": mimeType,
 		});
 		res.end(contents);
 	});
-    return server;
+	const listen = async (port?: number): Promise<void> =>
+		new Promise((resolve, reject) => {
+			httpServer
+				.once("error", (error) => reject(error))
+				.once("listening", () => resolve())
+				.listen(port);
+		});
+	try {
+		await listen(DEFAULT_SERVER_PORT);
+	} catch (error) {
+		if (
+			error instanceof Error &&
+			isErrnoException(error) &&
+			error.code !== "EADDRINUSE"
+		) {
+			throw error;
+		}
+		await listen();
+	}
+	const port = portFromServer(httpServer.address());
+	console.log(`Listening at http://127.0.0.1:${port}`);
+	return httpServer;
 };

 const startWebSocketServer = async (
-    server: http.Server
+	httpServer: http.Server,
 ): Promise<import("ws").Server | undefined> => {
 	// Attempt to load the ws module, aborting if it isn't available.
-    let ws;
+	let ws: typeof import("ws");
 	try {
 		ws = await import("ws");
 	} catch (error) {
-        if (error.code !== "MODULE_NOT_FOUND") {
+		if (
+			error instanceof Error &&
+			isErrnoException(error) &&
+			error.code !== "MODULE_NOT_FOUND"
+		) {
 			throw error;
 		}
 		console.warn(`'ws' module not found, live-reloading will be disabled`);
 		return;
 	}
-    const wsServer = new ws.Server({ server });
+	const wsServer = new ws.Server({ server: httpServer });
 	wsServer.on("connection", () => {
 		console.log("connected to dev site");
 	});
@ -177,28 +219,32 @@ const startWebSocketServer = async (

 const watchFolders = async (
 	folders: string[],
-    listener: (eventType: "update" | "remove", fileName: string) => void
+	listener: (eventType?: "update" | "remove", fileName?: string) => void,
 ): Promise<void> => {
 	// Try to load node-watch, falling back to fs watch if node-watch isn't
 	// available.
 	try {
-        const { default: watch } = await import("node-watch");
-        watch(folders, { recursive: true }, listener);
+		const nodeWatch = await import("node-watch");
+		nodeWatch.default(folders, { recursive: true }, listener);
 		return;
 	} catch (error) {
-        if (error.code !== "MODULE_NOT_FOUND") {
+		if (
+			error instanceof Error &&
+			isErrnoException(error) &&
+			error.code !== "MODULE_NOT_FOUND"
+		) {
 			throw error;
 		}
 		console.warn(
 			`'node-watch' module not found, falling back to fs.watch (may ` +
-                `result in file watch issues on some OSes)`
+				"result in file watch issues on some OSes)",
 		);
 	}
 	// NOTE: fs.watch has significant cross-platform issues, including
 	//       triggering duplicate file events on some systems.
 	for (const folder of folders) {
 		watch(folder, { recursive: true }, (_, fileName) => {
-            listener("update", fileName);
+			listener("update", fileName || undefined);
 		});
 	}
 };
@ -244,19 +290,18 @@ const devCommand: Command = {
 		};
 		const config = await rebuild();
 		const { outDir } = config.paths;
-        const httpServer = serve(outDir);
+		const httpServer = await startHttpServer(outDir);
 		const wsServer = await startWebSocketServer(httpServer);
-        httpServer.listen(SERVER_PORT, () => {
-            console.log(`Listening at http://127.0.0.1:${SERVER_PORT}`);
-        });
 		const watchedFolders = config.watch.filter((filePath) =>
-            existsSync(filePath)
+			existsSync(filePath),
 		);
-        watchFolders(watchedFolders, async (event, filePath) => {
-            console.log(`${filePath}:${event} triggering rebuild...`);
+		await watchFolders(watchedFolders, async (event, filePath) => {
+			const filePathForLog = filePath || "<UNKNOWN_FILE>";
+			const eventForLog = event || "<UNKNOWN_EVENT>";
+			console.log(`${filePathForLog}:${eventForLog} triggering rebuild...`);
 			await rebuild();
 			if (wsServer != null) {
-                console.log(`rebuild finished, reloading browsers...`);
+				console.log("rebuild finished, reloading browsers...");
 				for (const ws of wsServer.clients) {
 					ws.send("reload");
 				}
--- a/src/cli/index.ts
+++ b/src/cli/index.ts
@ -3,7 +3,7 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { Command, UsageError } from "./types";
+import { type Command, UsageError } from "./types";

 const globalHelpText = `\
 Usage: websnacks [...globalOptions] <command>
@ -24,7 +24,7 @@ interface Options {
 }

 const parseArgs = (
-    args: string[]
+	args: string[],
 ): { options: Options; commandName?: string; commandArgs: string[] } => {
 	const options: Options = {
 		showHelp: false,
@ -45,8 +45,8 @@ const parseArgs = (
 				const moduleName = args.shift();
 				if (moduleName == null) {
 					throw new UsageError(
-                        `-r requires a valid module name`,
-                        globalHelpText
+						"-r requires a valid module name",
+						globalHelpText,
 					);
 				}
 				options.require.push(moduleName);
@ -67,7 +67,7 @@ const _main = async (args: string[]): Promise<void> => {
 		return;
 	}
 	if (commandName == null) {
-        throw new UsageError(`must specify a valid command`, globalHelpText);
+		throw new UsageError("must specify a valid command", globalHelpText);
 	}
 	for (const moduleName of options.require) {
 		await import(moduleName);
@ -82,10 +82,7 @@ const _main = async (args: string[]): Promise<void> => {
 			command = await import("./commands/dev");
 			break;
 		default:
-            throw new UsageError(
-                `unknown command ${commandName}`,
-                globalHelpText
-            );
+			throw new UsageError(`unknown command ${commandName}`, globalHelpText);
 	}
 	// NOTE: Should this just delegate to the command?
 	for (const arg of commandArgs) {
--- a/src/component.ts
+++ b/src/component.ts
@ -37,15 +37,15 @@ export type Element =
 /**
 * Custom HTMLElement factory that can be parameterized by props.
 */
-export interface Component<P extends object = {}> {
+export interface Component<P extends object = Record<string, unknown>> {
 	(
 		props: P & {
 			children?: Element[];
-        }
+		},
 	): HTMLElement;
 }

-export const Fragment: Component<{}> = ({ children }) => ({
+export const Fragment: Component = ({ children }) => ({
 	tag: "#fragment",
 	attributes: {},
 	children: children || [],
--- a/src/config.ts
+++ b/src/config.ts
@ -3,9 +3,9 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import * as path from "path";
+import * as path from "node:path";

-import { purgeModuleAndDepsFromCache } from "./utils";
+import { decacheModule } from "./utils";

 /**
 * Paths used during configuration.
@ -58,13 +58,31 @@ const noop = () => {};
 * @return Fully-realized configuration.
 */
 export const loadConfig = async (rootDir: string): Promise<Config> => {
-    const configPath = require.resolve(path.resolve(rootDir, "websnacks"));
-    purgeModuleAndDepsFromCache(configPath);
+	let configPath = "";
+	let userConfig: UserConfig = {};
+	// Attempt to load a websnacks.ts/js file in rootDir.
+	try {
+		configPath = require.resolve(path.resolve(rootDir, "websnacks"));
+		decacheModule(configPath);
 		// TODO: validate user config.
-    const userConfig = await import(configPath);
+		userConfig = await import(configPath);
+	} catch (_error) {
+		// Use default config;
+	}
 	const outDir = path.join(rootDir, "public");
 	const pagesDir = path.join(rootDir, "pages");
 	const staticAssetsDir = path.join(rootDir, "static");
+
+	const watch = [pagesDir, staticAssetsDir];
+	if (configPath) {
+		watch.push(path.relative(rootDir, configPath));
+	}
+	if (userConfig.watch != null) {
+		for (const userWatch of userConfig.watch) {
+			watch.push(path.relative(rootDir, userWatch));
+		}
+	}
+
 	return {
 		paths: {
 			rootDir,
@ -76,11 +94,8 @@ export const loadConfig = async (rootDir: string): Promise<Config> => {
 			afterSiteRender: noop,
 			...userConfig.hooks,
 		},
-        watch: [
-            ...userConfig.watch.map((p: string) => path.relative(rootDir, p)),
-            path.relative(rootDir, configPath),
-            pagesDir,
-            staticAssetsDir,
-        ],
+		watch,
 	};
 };
+
+export const defineConfig = (userConfig: UserConfig): UserConfig => userConfig;
--- a/src/create-element.ts
+++ b/src/create-element.ts
@ -3,8 +3,8 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { Component, Element, HTMLElement } from "./component";
-import { HTMLAttributes } from "./jsx";
+import type { Component, Element, HTMLElement } from "./component";
+import type { HTMLAttributes } from "./jsx";
 import { flatDeep } from "./utils";

 /**
@ -38,8 +38,7 @@ export function createElement(
 	...children: Element[]
 ): HTMLElement;
 export function createElement(
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    type: string | Component<any>,
+	type: string | Component,
 	props: object | null,
 	...children: Element[]
 ): HTMLElement {
@ -54,14 +53,21 @@ export function createElement(
 	}
 	const attrs: Record<string, string | number | boolean> = {};
 	for (const [key, value] of Object.entries(props || {})) {
+		if (key === "dangerouslySetInnerHTML") {
+			if (children.length > 0) {
+				throw new Error(
+					'An element with children may not have a "dangerouslySetInnerHTML" prop since children would be overriden',
+				);
+			}
+			attrs[key] = value.__html;
+			continue;
+		}
 		if (
 			typeof value !== "string" &&
 			typeof value !== "number" &&
 			typeof value !== "boolean"
 		) {
-            console.warn(
-                `non-primitive attribute ${key} = ${JSON.stringify(value)}`
-            );
+			console.warn(`non-primitive attribute ${key} = ${JSON.stringify(value)}`);
 			continue;
 		}
 		attrs[key] = value;
--- a/src/index.ts
+++ b/src/index.ts
@ -3,7 +3,7 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-export { HTMLElement, Component, Fragment } from "./component";
-export { UserConfig as Config } from "./config";
+export { Component, Fragment, HTMLElement } from "./component";
+export { defineConfig, UserConfig as Config } from "./config";
 export { createElement } from "./create-element";
 export * from "./jsx";
--- a/src/jsx.ts
+++ b/src/jsx.ts
@ -4,7 +4,7 @@
 */

 // eslint-disable-next-line @typescript-eslint/no-unused-vars
-import { HTMLElement } from "./component";
+import type { HTMLElement } from "./component";

 export interface RdfaAttributes {
 	about?: string;
@ -25,7 +25,14 @@ export interface MicrodataAttributes {
 	itemRef?: string;
 }

-export interface HTMLAttributes extends RdfaAttributes, MicrodataAttributes {
+export interface SetInnerHtmlAttributes {
+	dangerouslySetInnerHTML?: { __html: string };
+}
+
+export interface HTMLAttributes
+	extends RdfaAttributes,
+		MicrodataAttributes,
+		SetInnerHtmlAttributes {
 	accept?: string;
 	acceptCharset?: string;
 	accessKey?: string;
--- a/src/render.ts
+++ b/src/render.ts
@ -3,7 +3,7 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { Element, HTMLElement } from "./component";
+import type { Element, HTMLElement } from "./component";

 const HTML_ESCAPES: { [char: string]: string } = {
 	"&": "&amp;",
@ -34,9 +34,13 @@ const renderElement = (elem: Element): string => {

 	let output = "";
 	output += startTag(elem);
+	if (elem.attributes.dangerouslySetInnerHTML != null) {
+		output += elem.attributes.dangerouslySetInnerHTML;
+	} else {
 		for (const child of elem.children) {
 			output += renderElement(child);
 		}
+	}
 	output += endTag(elem);
 	return output;
 };
@ -55,6 +59,11 @@ const startTag = (elem: HTMLElement): string => {
 			continue;
 		}

+		// Ignore the special attr for setting raw inner HTML.
+		if (attrName === "dangerouslySetInnerHTML") {
+			continue;
+		}
+
 		let normalizedAttrName = escapeHtml(attrName.toLowerCase());
 		if (normalizedAttrName === "classname") {
 			normalizedAttrName = "class";
@ -62,9 +71,7 @@ const startTag = (elem: HTMLElement): string => {
 		if (attrValue === true) {
 			output += ` ${normalizedAttrName}=""`;
 		} else {
-            output += ` ${normalizedAttrName}="${escapeAttr(
-                attrValue.toString()
-            )}"`;
+			output += ` ${normalizedAttrName}="${escapeAttr(attrValue.toString())}"`;
 		}
 	}

@ -88,19 +95,19 @@ const endTag = (elem: HTMLElement): string => {
 * @return Fully rendered HTML document as a string.
 */
 export const renderPage = (rootElem: Element): string => {
-    if (rootElem == undefined) {
-        throw new Error(`root page element cannot be null`);
+	if (rootElem == null) {
+		throw new Error("root page element cannot be null");
 	}
 	if (typeof rootElem !== "object" || !("tag" in rootElem)) {
 		throw new Error(
 			`root page element must be a valid HTMLElement, got ${JSON.stringify(
-                rootElem
-            )}`
+				rootElem,
+			)}`,
 		);
 	}
 	if (rootElem.tag.toLowerCase() !== "html") {
 		throw new Error(
-            `attempted to render page with non-HTML root element ${rootElem.tag}`
+			`attempted to render page with non-HTML root element ${rootElem.tag}`,
 		);
 	}

--- a/src/utils.ts
+++ b/src/utils.ts
@ -1,71 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at https://mozilla.org/MPL/2.0/.
- */
-
-import { promises as fs } from "fs";
-import * as path from "path";
-
-/**
- * Recursively walk a directory, returning the files it finds.
- *
- * @param dirPath Path to the directory to walk.
- *
- * @return Generator that yields the files found while walking the directory.
- */
-export const walkDir = async function* (
-    dirPath: string
-): AsyncGenerator<string> {
-    const dirEnts = await fs.readdir(dirPath, { withFileTypes: true });
-    for (const dirEnt of dirEnts) {
-        if (dirEnt.isDirectory()) {
-            yield* walkDir(path.join(dirPath, dirEnt.name));
-        }
-        if (dirEnt.isFile()) {
-            yield path.join(dirPath, dirEnt.name);
-        }
-    }
-};
-
-/**
- * Purge cached versions of a node module and all of its dependencies from the
- * global require cache, ensuring that future imports reload the module from
- * disk.
- *
- * @param modName Name of the module to purge from the require cache.
- */
-export const purgeModuleAndDepsFromCache = (modName: string): void => {
-    const modPath = require.resolve(modName);
-    if (modPath == null) {
-        return;
-    }
-    const mod = require.cache[modPath];
-    if (mod == null) {
-        return;
-    }
-    for (const child of mod.children) {
-        purgeModuleAndDepsFromCache(child.id);
-    }
-    delete require.cache[modPath];
-};
-
-export type Flattenable<T> = Array<T | Flattenable<T>>;
-
-/**
- * Flatten an arbitrarily-deeply nested array into a flat array.
- *
- * @param arr Array to flatten.
- *
- * @return Flattened array.
- */
-export const flatDeep = <T>(arr: Flattenable<T>): T[] => {
-    const flattenedArr: T[] = [];
-    for (const val of arr) {
-        if (Array.isArray(val)) {
-            flattenedArr.push(...flatDeep(val));
-        } else {
-            flattenedArr.push(val);
-        }
-    }
-    return flattenedArr;
-};
--- a/src/utils/decache-module.ts
+++ b/src/utils/decache-module.ts
@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { isErrnoException } from "./error";
+
+const resolveModulePath = (importPath: string): string | undefined => {
+	try {
+		return require.resolve(importPath);
+	} catch (error) {
+		if (
+			error instanceof Error &&
+			isErrnoException(error) &&
+			error.code === "MODULE_NOT_FOUND"
+		) {
+			return;
+		}
+		throw error;
+	}
+};
+
+const removeParentModuleRef = (mod: NodeModule): void => {
+	const parent = mod.parent;
+	if (parent == null) {
+		return;
+	}
+
+	const siblings = parent.children;
+	const nSiblings = siblings.length;
+	for (let i = nSiblings - 1; i >= 0; i--) {
+		const sibling = siblings[i];
+		if (sibling.id === mod.id) {
+			siblings.splice(i, 1);
+			return;
+		}
+	}
+};
+
+/**
+ * Clear a module and its dependencies from node's module cache, ensuring that
+ * requiring the module again will reload the code from disk.
+ *
+ * @param importPath Path or name of the module to resolve (same as
+ *        {@see require}).
+ *
+ * @throws Error if the module could not be resolved due to filesystem error.
+ */
+export const decacheModule = (importPath: string): void => {
+	const modulePath = resolveModulePath(importPath);
+	if (modulePath == null) {
+		return;
+	}
+
+	// DFS the module dependency tree, using iteration to avoid stack size
+	// exceeded exceptions.
+	const modsToCheck: NodeModule[] = [];
+	const visited: Set<string> = new Set();
+	let currentMod: NodeModule | undefined = require.cache[modulePath];
+	while (currentMod != null) {
+		if (visited.has(currentMod.id)) {
+			currentMod = modsToCheck.pop();
+			continue;
+		}
+
+		removeParentModuleRef(currentMod);
+		delete require.cache[currentMod.id];
+		for (const childMod of currentMod.children) {
+			modsToCheck.push(childMod);
+		}
+
+		visited.add(currentMod.id);
+		currentMod = modsToCheck.pop();
+	}
+};
--- a/src/utils/error.ts
+++ b/src/utils/error.ts
@ -0,0 +1,3 @@
+export const isErrnoException = (
+	error: Error,
+): error is NodeJS.ErrnoException => "code" in error;
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@ -0,0 +1,51 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { promises as fs } from "node:fs";
+import * as path from "node:path";
+
+export { decacheModule } from "./decache-module";
+
+/**
+ * Recursively walk a directory, returning the files it finds.
+ *
+ * @param dirPath Path to the directory to walk.
+ *
+ * @return Generator that yields the files found while walking the directory.
+ */
+export const walkDir = async function* (
+	dirPath: string,
+): AsyncGenerator<string> {
+	const dirEnts = await fs.readdir(dirPath, { withFileTypes: true });
+	for (const dirEnt of dirEnts) {
+		if (dirEnt.isDirectory()) {
+			yield* walkDir(path.join(dirPath, dirEnt.name));
+		}
+		if (dirEnt.isFile()) {
+			yield path.join(dirPath, dirEnt.name);
+		}
+	}
+};
+
+export type Flattenable<T> = Array<T | Flattenable<T>>;
+
+/**
+ * Flatten an arbitrarily-deeply nested array into a flat array.
+ *
+ * @param arr Array to flatten.
+ *
+ * @return Flattened array.
+ */
+export const flatDeep = <T>(arr: Flattenable<T>): T[] => {
+	const flattenedArr: T[] = [];
+	for (const val of arr) {
+		if (Array.isArray(val)) {
+			flattenedArr.push(...flatDeep(val));
+		} else {
+			flattenedArr.push(val);
+		}
+	}
+	return flattenedArr;
+};
--- a/test/e2e/build.tsx
+++ b/test/e2e/build.tsx
@ -0,0 +1,151 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { promises as fs } from "node:fs";
+import * as path from "node:path";
+
+import {
+	npmCmd,
+	runCommand,
+	WEBSNACKS_BIN_PATH,
+	WEBSNACKS_REPO_ROOT,
+	withTempDir,
+} from "../helpers/e2e";
+import { testSuite } from "../lib";
+
+testSuite("build command", ({ test }) => {
+	test("runs without throwing error", async () => {
+		await withTempDir(async (tempDirPath) => {
+			await fs.writeFile(
+				path.join(tempDirPath, "tsconfig.json"),
+				JSON.stringify({
+					compilerOptions: {
+						esModuleInterop: true,
+						module: "CommonJS",
+						moduleResolution: "node",
+						jsx: "react",
+						jsxFactory: "createElement",
+						target: "ES2018",
+						lib: ["ES2018"],
+						strict: true,
+						noUnusedLocals: true,
+						noUnusedParameters: true,
+						noImplicitReturns: true,
+						noFallthroughCasesInSwitch: true,
+					},
+					include: ["components/**/*", "pages/**/*"],
+				}),
+				{
+					encoding: "utf8",
+				},
+			);
+			await fs.writeFile(
+				path.join(tempDirPath, "websnacks.ts"),
+				`
+                import { Config } from "websnacks";
+                const config: Config = {
+                    watch: [],
+                };
+                export = config;
+                `,
+				{
+					encoding: "utf8",
+				},
+			);
+			const pagesPath = path.join(tempDirPath, "pages");
+			await fs.mkdir(pagesPath);
+			await fs.writeFile(
+				path.join(pagesPath, "index.tsx"),
+				`
+                import { createElement } from "websnacks";
+                export const page = () => <html />;
+                `,
+				{
+					encoding: "utf8",
+				},
+			);
+			await fs.writeFile(
+				path.join(tempDirPath, "package.json"),
+				JSON.stringify({
+					devDependencies: {
+						websnacks: `file:${WEBSNACKS_REPO_ROOT}`,
+					},
+				}),
+				{ encoding: "utf8" },
+			);
+			await runCommand(npmCmd, ["install", "--silent"], {
+				cwd: tempDirPath,
+			}).complete;
+			const cmd = runCommand(
+				"node",
+				[WEBSNACKS_BIN_PATH, "-r", "ts-node/register", "build"],
+				{
+					cwd: tempDirPath,
+				},
+			);
+			await cmd.complete;
+		});
+	});
+
+	test("works without config file", async () => {
+		await withTempDir(async (tempDirPath) => {
+			await fs.writeFile(
+				path.join(tempDirPath, "tsconfig.json"),
+				JSON.stringify({
+					compilerOptions: {
+						esModuleInterop: true,
+						module: "CommonJS",
+						moduleResolution: "node",
+						jsx: "react",
+						jsxFactory: "createElement",
+						target: "ES2018",
+						lib: ["ES2018"],
+						strict: true,
+						noUnusedLocals: true,
+						noUnusedParameters: true,
+						noImplicitReturns: true,
+						noFallthroughCasesInSwitch: true,
+					},
+					include: ["components/**/*", "pages/**/*"],
+				}),
+				{
+					encoding: "utf8",
+				},
+			);
+			const pagesPath = path.join(tempDirPath, "pages");
+			await fs.mkdir(pagesPath);
+			await fs.writeFile(
+				path.join(pagesPath, "index.tsx"),
+				`
+                import { createElement } from "websnacks";
+                export const page = () => <html />;
+                `,
+				{
+					encoding: "utf8",
+				},
+			);
+			await fs.writeFile(
+				path.join(tempDirPath, "package.json"),
+				JSON.stringify({
+					devDependencies: {
+						websnacks: `file:${WEBSNACKS_REPO_ROOT}`,
+					},
+				}),
+				{ encoding: "utf8" },
+			);
+			await runCommand(npmCmd, ["install", "--silent"], {
+				cwd: tempDirPath,
+			}).complete;
+			const cmd = runCommand(
+				"node",
+				[WEBSNACKS_BIN_PATH, "-r", "ts-node/register", "build"],
+				{
+					cwd: tempDirPath,
+				},
+			);
+			await cmd.complete;
+		});
+	});
+});
--- a/test/e2e/dev.tsx
+++ b/test/e2e/dev.tsx
@ -0,0 +1,160 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { promises as fs } from "node:fs";
+import * as path from "node:path";
+
+import {
+	npmCmd,
+	runCommand,
+	WEBSNACKS_BIN_PATH,
+	WEBSNACKS_REPO_ROOT,
+	wait,
+	withTempDir,
+} from "../helpers/e2e";
+import { testSuite } from "../lib";
+
+testSuite("dev command", ({ test, expect }) => {
+	test("starts without throwing error", async () => {
+		await withTempDir(async (tempDirPath) => {
+			await fs.writeFile(
+				path.join(tempDirPath, "tsconfig.json"),
+				JSON.stringify({
+					compilerOptions: {
+						esModuleInterop: true,
+						module: "CommonJS",
+						moduleResolution: "node",
+						jsx: "react",
+						jsxFactory: "createElement",
+						target: "ES2018",
+						lib: ["ES2018"],
+						strict: true,
+						noUnusedLocals: true,
+						noUnusedParameters: true,
+						noImplicitReturns: true,
+						noFallthroughCasesInSwitch: true,
+					},
+					include: ["components/**/*", "pages/**/*"],
+				}),
+				{
+					encoding: "utf8",
+				},
+			);
+			await fs.writeFile(
+				path.join(tempDirPath, "websnacks.ts"),
+				`
+                import { Config } from "websnacks";
+                const config: Config = {
+                    watch: [],
+                };
+                export = config;
+                `,
+				{
+					encoding: "utf8",
+				},
+			);
+			const pagesPath = path.join(tempDirPath, "pages");
+			await fs.mkdir(pagesPath);
+			await fs.writeFile(
+				path.join(pagesPath, "index.tsx"),
+				`
+                import { createElement } from "websnacks";
+                export const page = () => <html />;
+                `,
+				{
+					encoding: "utf8",
+				},
+			);
+			await fs.writeFile(
+				path.join(tempDirPath, "package.json"),
+				JSON.stringify({
+					devDependencies: {
+						websnacks: `file:${WEBSNACKS_REPO_ROOT}`,
+					},
+				}),
+				{ encoding: "utf8" },
+			);
+			await runCommand(npmCmd, ["install", "--silent"], {
+				cwd: tempDirPath,
+			}).complete;
+			const cmd = runCommand(
+				"node",
+				[WEBSNACKS_BIN_PATH, "-r", "ts-node/register", "dev"],
+				{
+					cwd: tempDirPath,
+				},
+			);
+			// FIXME: This test is a bit brittle due to relying on timeouts.
+			await wait(10_000);
+			cmd.process.kill();
+			const stdout = await cmd.complete;
+			expect(stdout).toStartWith("Listening at");
+		});
+	});
+
+	test("works without config file", async () => {
+		await withTempDir(async (tempDirPath) => {
+			await fs.writeFile(
+				path.join(tempDirPath, "tsconfig.json"),
+				JSON.stringify({
+					compilerOptions: {
+						esModuleInterop: true,
+						module: "CommonJS",
+						moduleResolution: "node",
+						jsx: "react",
+						jsxFactory: "createElement",
+						target: "ES2018",
+						lib: ["ES2018"],
+						strict: true,
+						noUnusedLocals: true,
+						noUnusedParameters: true,
+						noImplicitReturns: true,
+						noFallthroughCasesInSwitch: true,
+					},
+					include: ["components/**/*", "pages/**/*"],
+				}),
+				{
+					encoding: "utf8",
+				},
+			);
+			const pagesPath = path.join(tempDirPath, "pages");
+			await fs.mkdir(pagesPath);
+			await fs.writeFile(
+				path.join(pagesPath, "index.tsx"),
+				`
+                import { createElement } from "websnacks";
+                export const page = () => <html />;
+                `,
+				{
+					encoding: "utf8",
+				},
+			);
+			await fs.writeFile(
+				path.join(tempDirPath, "package.json"),
+				JSON.stringify({
+					devDependencies: {
+						websnacks: `file:${WEBSNACKS_REPO_ROOT}`,
+					},
+				}),
+				{ encoding: "utf8" },
+			);
+			await runCommand(npmCmd, ["install", "--silent"], {
+				cwd: tempDirPath,
+			}).complete;
+			const cmd = runCommand(
+				"node",
+				[WEBSNACKS_BIN_PATH, "-r", "ts-node/register", "dev"],
+				{
+					cwd: tempDirPath,
+				},
+			);
+			// FIXME: This test is a bit brittle due to relying on timeouts.
+			await wait(10_000);
+			cmd.process.kill();
+			const stdout = await cmd.complete;
+			expect(stdout).toStartWith("Listening at");
+		});
+	});
+});
--- a/test/helpers/e2e.ts
+++ b/test/helpers/e2e.ts
@ -0,0 +1,168 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { type ChildProcess, spawn } from "node:child_process";
+import { promises as fs } from "node:fs";
+import * as os from "node:os";
+import * as path from "node:path";
+
+/**
+ * Set a timeout and wait for at least the specified number of milliseconds,
+ * resolving the promise once the event loop meets or exceeds timeMs.
+ *
+ * @param timeMs Time in milliseconds to wait.
+ */
+export const wait = async (timeMs: number): Promise<void> => {
+	return new Promise((resolve) => {
+		setTimeout(() => resolve(), timeMs);
+	});
+};
+
+const TEMP_PATH = path.resolve(__dirname, "..", "..", ".temp");
+
+/**
+ * Perform an operation within a unique temporary directory created within a
+ * special .test-dist folder within this websnacks repository.
+ *
+ * @note Currently the temporary folder is **not** cleaned up once the operation
+ *       has finished. I've had issues with losing work due to buggy removal
+ *       code and haven't been willing to risk it again. To cleanup these
+ *       temporary folders it should be as easy as removing the whole
+ *       ".test-dist" folder from your checkout.
+ *
+ * @param op Operation to perform which receives the fully resolved temp
+ *           directory path as its only argument.
+ */
+export const withTempDir = async (
+	op: (tempDirPath: string) => Promise<void> | void,
+): Promise<void> => {
+	await fs.mkdir(TEMP_PATH, { recursive: true });
+	const tempDirPath = await fs.mkdtemp(`${TEMP_PATH}/`);
+	try {
+		await op(tempDirPath);
+	} catch (error) {
+		throw new Error(`(${tempDirPath}): ${error}`);
+	}
+};
+
+/**
+ * Fully resolved path to the root of this websnacks repository.
+ */
+export const WEBSNACKS_REPO_ROOT = path.resolve(__dirname, "..", "..");
+/**
+ * Fully resolved path to the websnacks CLI script in this repository.
+ */
+export const WEBSNACKS_BIN_PATH = path.join(
+	WEBSNACKS_REPO_ROOT,
+	"bin",
+	"websnacks.js",
+);
+
+/**
+ * A handle to an asynchronous shell command run in a subprocess.
+ */
+export interface AsyncCommand {
+	/**
+	 * Promise that resolves with the stdout of the subprocess once the
+	 * subprocess exits with a zero-code.
+	 *
+	 * The promise rejects if the subprocess exits with a non-zero code, the
+	 * subprocess writes to its stderr, or the command failed to spawn.
+	 */
+	complete: Promise<string>;
+	/**
+	 * Handle to to child process for event-based process manipulation.
+	 */
+	process: ChildProcess;
+}
+
+/**
+ * Options used to configure {@link runCommand}.
+ */
+export interface CliOptions {
+	/**
+	 * Working directory where the command should be run. Defaults to the
+	 * current working directory.
+	 */
+	cwd?: string;
+	/**
+	 * Timeout in milliseconds after which a command that hasn't exited will
+	 * reject the promise and kill the subprocess.
+	 */
+	timeoutMs?: number;
+}
+
+const DEFAULT_CLI_OPTIONS = {
+	timeoutMs: 15_000,
+};
+
+/**
+ * Execute a shell command in a subprocess.
+ *
+ * This provides a more user-friendly promise-based interface to
+ * {@link child_process.spawn}. The obj
+ *
+ * @param command Name of the shell command to run.
+ * @param args Array of arguments to pass to the command.
+ * @param options Parameters to change how the command is run and resolved.
+ *
+ * @returns Command object for handling in client code.
+ */
+export const runCommand = (
+	command: string,
+	args: string[] = [],
+	options?: CliOptions,
+): AsyncCommand => {
+	const optionsWithDefaults = { ...DEFAULT_CLI_OPTIONS, ...options };
+	const process = spawn(command, args, {
+		...optionsWithDefaults,
+		stdio: "pipe",
+	});
+	const complete = new Promise<string>((resolve, reject) => {
+		let threwError = false;
+
+		let stdout = "";
+		process.stdout.on("data", (data) => {
+			stdout += data.toString();
+		});
+		process.stderr.on("data", (data) => {
+			threwError = true;
+			process.kill();
+			reject(new Error(`command output to stderr: ${data.toString()}`));
+		});
+
+		const timer = setTimeout(() => {
+			threwError = true;
+			process.kill();
+			reject(
+				new Error(`max timeout of ${optionsWithDefaults.timeoutMs}ms reached`),
+			);
+		}, optionsWithDefaults.timeoutMs);
+		process.on("exit", (code) => {
+			if (threwError) {
+				return;
+			}
+			clearTimeout(timer);
+			if (code !== null && code !== 0) {
+				reject(new Error(`command exited with non-zero code: ${code}`));
+				return;
+			}
+			resolve(stdout);
+		});
+		process.on("error", (error) => {
+			clearTimeout(timer);
+			if (!threwError) {
+				reject(new Error(`command errored: ${error}`));
+				threwError = true;
+			}
+		});
+	});
+	return {
+		complete,
+		process,
+	};
+};
+
+export const npmCmd = os.platform() === "win32" ? "npm.cmd" : "npm";
--- a/test/lib/expect.ts
+++ b/test/lib/expect.ts
@ -10,7 +10,7 @@ class ExpectError extends Error {
 		super(
 			`${reason}\n` +
 				`\texpected: ${displayValue(expected)}\n` +
-                `\tactual  : ${displayValue(actual)}`
+				`\tactual  : ${displayValue(actual)}`,
 		);
 	}
 }
@ -48,9 +48,9 @@ export class Expect<T> {
 	public toEqual(expected: T): void {
 		if (!areEqual(this.value, expected)) {
 			throw new ExpectError(
-                `value does not equal expected`,
+				"value does not equal expected",
 				expected,
-                this.value
+				this.value,
 			);
 		}
 	}
@ -71,9 +71,9 @@ export class StringExpect extends Expect<string> {
 	public toMatch(pattern: RegExp): void {
 		if (!this.value.match(pattern)) {
 			throw new ExpectError(
-                `value does not match expected pattern`,
+				"value does not match expected pattern",
 				pattern,
-                this.value
+				this.value,
 			);
 		}
 	}
@ -89,9 +89,9 @@ export class StringExpect extends Expect<string> {
 	public toStartWith(prefix: string): void {
 		if (!this.value.startsWith(prefix)) {
 			throw new ExpectError(
-                `value does not start with expected prefix`,
+				"value does not start with expected prefix",
 				prefix,
-                this.value
+				this.value,
 			);
 		}
 	}
@ -107,9 +107,9 @@ export class StringExpect extends Expect<string> {
 	public toEndWith(suffix: string): void {
 		if (!this.value.endsWith(suffix)) {
 			throw new ExpectError(
-                `value does not end with expected suffix`,
+				"value does not end with expected suffix",
 				suffix,
-                this.value
+				this.value,
 			);
 		}
 	}
@ -135,25 +135,21 @@ export class FunctionExpect<T> extends Expect<() => T> {
 			this.value();
 		} catch (error) {
 			if (!(error instanceof Error)) {
-                throw new ExpectError(
-                    `function threw non-Error value`,
-                    pattern,
-                    error
-                );
+				throw new ExpectError("function threw non-Error value", pattern, error);
 			}
 			if (!matches(error.message, pattern)) {
 				throw new ExpectError(
 					`thrown Error's message does not match pattern`,
 					pattern,
-                    error.message
+					error.message,
 				);
 			}
 			return;
 		}
 		throw new ExpectError(
-            `function did not throw expected error`,
+			"function did not throw expected error",
 			pattern,
-            null
+			null,
 		);
 	}
 }
--- a/test/lib/harness.ts
+++ b/test/lib/harness.ts
@ -39,9 +39,7 @@ const runTest = async (test: Test): Promise<TestResult> => {
 			error:
 				error instanceof Error
 					? error
-                    : new Error(
-                          `threw non-error object: ${displayValue(error)}`
-                      ),
+					: new Error(`threw non-error object: ${displayValue(error)}`),
 		};
 	}
 	return result;
@ -86,7 +84,7 @@ export interface TestSuiteContext {
 */
 export const testSuite = (
 	suiteName: string,
-    def: (ctx: TestSuiteContext) => void
+	def: (ctx: TestSuiteContext) => void,
 ): void => {
 	const tests: Test[] = [];
 	const test = (name: string, runTest: () => void | Promise<void>): void => {
@ -104,14 +102,14 @@ export const testSuite = (
 			if (testResult.result === "fail") {
 				console.error(
 					`[TEST FAILURE] "${suiteName}": "${testResult.testName}": ` +
-                        `${testResult.error.stack}\n`
+						`${testResult.error.stack}\n`,
 				);
 				continue;
 			}
 			passed += 1;
 		}
 		console.info(
-            `[TEST] suite "${suiteName}": ${passed} of ${tests.length} succeeded\n\n`
+			`[TEST] suite "${suiteName}": ${passed} of ${tests.length} succeeded\n\n`,
 		);
 		if (passed < tests.length) {
 			process.exitCode = 1;
--- a/test/lib/utils.ts
+++ b/test/lib/utils.ts
@ -20,7 +20,7 @@ export const shuffle = <T>(arr: T[]): void => {
 };

 const areArraysEqual = <T>(a: T[], b: T[]): boolean => {
-    if (a.length != b.length) {
+	if (a.length !== b.length) {
 		return false;
 	}
 	for (let i = 0; i < a.length; i++) {
@ -33,7 +33,7 @@ const areArraysEqual = <T>(a: T[], b: T[]): boolean => {

 const areObjectsEqual = <T extends Record<string, unknown>>(
 	a: T,
-    b: T
+	b: T,
 ): boolean => {
 	const aKeys = Object.keys(a) as Array<keyof T>;
 	const bKeys = Object.keys(b) as Array<keyof T>;
@ -67,7 +67,7 @@ export const areEqual = <T>(a: T, b: T): boolean => {
 	if (typeof a === "object" && typeof b === "object") {
 		return areObjectsEqual(
 			a as Record<string, unknown>,
-            b as Record<string, unknown>
+			b as Record<string, unknown>,
 		);
 	}
 	return a === b;
--- a/test/run-e2e.ts
+++ b/test/run-e2e.ts
@ -0,0 +1,23 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { fork } from "node:child_process";
+import * as fs from "node:fs";
+import * as path from "node:path";
+
+import { shuffle } from "./lib/utils";
+
+const TEST_SUITES_DIR = path.join(__dirname, "e2e");
+const files = fs.readdirSync(TEST_SUITES_DIR);
+// Shuffle test suites to detect ordering dependencies between them.
+shuffle(files);
+for (const file of files) {
+	const fullPath = path.join(TEST_SUITES_DIR, file);
+	fork(path.relative(process.cwd(), fullPath)).on("exit", (code) => {
+		if (code !== 0) {
+			process.exitCode = 1;
+		}
+	});
+}
--- a/test/run-tests.ts
+++ b/test/run-tests.ts
@ -3,14 +3,13 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { fork } from "child_process";
-import * as fs from "fs";
-import * as path from "path";
+import { fork } from "node:child_process";
+import * as fs from "node:fs";
+import * as path from "node:path";

 import { shuffle } from "./lib/utils";

 const TEST_SUITES_DIR = path.join(__dirname, "test-suites");
-
 const files = fs.readdirSync(TEST_SUITES_DIR);
 // Shuffle test suites to detect ordering dependencies between them.
 shuffle(files);
--- a/test/test-suites/rendering.tsx
+++ b/test/test-suites/rendering.tsx
@ -3,14 +3,14 @@
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

-import { Component, createElement, Fragment } from "../../dist";
+import { type Component, createElement, Fragment } from "../../dist";
 import { renderPage } from "../../dist/render";
 import { testSuite } from "../lib";

 testSuite("renderPage", ({ test, expect }) => {
 	test("throws an Error when root elem is not html tag", () => {
 		expect(() => renderPage(<div />)).toThrowErrorMatching(
-            "attempted to render page with non-HTML root element div"
+			"attempted to render page with non-HTML root element div",
 		);
 	});

@ -20,11 +20,9 @@ testSuite("renderPage", ({ test, expect }) => {
 	});

 	test("escapes HTML in tag names", () => {
-        const html = renderPage(
-            <html>{createElement("div></div", null)}</html>
-        );
+		const html = renderPage(<html>{createElement("div></div", null)}</html>);
 		expect(html).toEqual(
-            "<!DOCTYPE html><html><div&gt;&lt;/div></div&gt;&lt;/div></html>"
+			"<!DOCTYPE html><html><div&gt;&lt;/div></div&gt;&lt;/div></html>",
 		);
 	});

@ -32,10 +30,10 @@ testSuite("renderPage", ({ test, expect }) => {
 		const html = renderPage(
 			<html>
 				<div className="test" id="1" />
-            </html>
+			</html>,
 		);
 		expect(html).toEqual(
-            '<!DOCTYPE html><html><div class="test" id="1"></div></html>'
+			'<!DOCTYPE html><html><div class="test" id="1"></div></html>',
 		);
 	});

@ -48,18 +46,16 @@ testSuite("renderPage", ({ test, expect }) => {
 				<body>
 					<div />
 				</body>
-            </html>
+			</html>,
 		);
 		expect(html).toEqual(
-            "<!DOCTYPE html><html><head><title></title></head><body><div></div></body></html>"
+			"<!DOCTYPE html><html><head><title></title></head><body><div></div></body></html>",
 		);
 	});

 	test("renders text nodes", () => {
 		const html = renderPage(<html>There are three lights!</html>);
-        expect(html).toEqual(
-            "<!DOCTYPE html><html>There are three lights!</html>"
-        );
+		expect(html).toEqual("<!DOCTYPE html><html>There are three lights!</html>");
 	});

 	test("renders spliced number nodes", () => {
@ -80,10 +76,10 @@ testSuite("renderPage", ({ test, expect }) => {
 					<Light lightN={lightN} />
 				))}{" "}
 				lights!
-            </html>
+			</html>,
 		);
 		expect(html).toEqual(
-            "<!DOCTYPE html><html>There are <div>1</div><div>2</div><div>3</div> lights!</html>"
+			"<!DOCTYPE html><html>There are <div>1</div><div>2</div><div>3</div> lights!</html>",
 		);
 	});

@ -97,10 +93,10 @@ testSuite("renderPage", ({ test, expect }) => {
 		const html = renderPage(
 			<html>
 				There are <Light nLights={3} />!
-            </html>
+			</html>,
 		);
 		expect(html).toEqual(
-            "<!DOCTYPE html><html>There are <div>3 lights</div>!</html>"
+			"<!DOCTYPE html><html>There are <div>3 lights</div>!</html>",
 		);
 	});

@ -111,10 +107,43 @@ testSuite("renderPage", ({ test, expect }) => {
 					<div>test of</div>
 					<div>fragments</div>
 				</Fragment>
-            </html>
+			</html>,
 		);
 		expect(html).toEqual(
-            "<!DOCTYPE html><html><div>test of</div><div>fragments</div></html>"
+			"<!DOCTYPE html><html><div>test of</div><div>fragments</div></html>",
+		);
+	});
+
+	test("renders unescaped HTML via dangerouslySetInnerHTML", () => {
+		const html = renderPage(
+			<html>
+				<div
+					dangerouslySetInnerHTML={{
+						__html: "<div>red alert!</div>",
+					}}
+				/>
+			</html>,
+		);
+		expect(html).toEqual(
+			"<!DOCTYPE html><html><div><div>red alert!</div></div></html>",
+		);
+	});
+
+	test("throws error when both dangerouslySetInnerHTML and children prop present", () => {
+		expect(() =>
+			renderPage(
+				<html>
+					<div
+						dangerouslySetInnerHTML={{
+							__html: "<div>set phasers to kill</div>",
+						}}
+					>
+						<div>set phasers to stun</div>
+					</div>
+				</html>,
+			),
+		).toThrowErrorMatching(
+			'An element with children may not have a "dangerouslySetInnerHTML" prop since children would be overriden',
 		);
 	});
 });
--- a/tsconfig-base.json
+++ b/tsconfig-base.json
@ -1,6 +1,5 @@
 {
 	"compilerOptions": {
-        "esModuleInterop": true,
 		"module": "CommonJS",
 		"moduleResolution": "node",
 		"target": "ES2018",