Use port 3000 by default, and fall back to some other arbitrary port …

…if 3000 is already in use. Fixes #470

README.md

@@ -92,7 +92,8 @@ Run
 
     pnpm run start
 
-and point your browser to <http://localhost:3000/>. If you use the command `pnpm
+and point your browser to <http://localhost:3000/> (or it will use a different
+port if 3000 is already used by somethign else). If you use the command `pnpm
 run start-watch` from above, then running the command `pnpm run start` is not
 necessary.
 

package.json

@@ -137,6 +137,7 @@
 		"eslint-plugin-react-hooks": "^5.0.0",
 		"fake-indexeddb": "^6.0.0",
 		"fs-extra": "^11.2.0",
+		"get-port": "^7.1.0",
 		"globals": "^15.13.0",
 		"html-minifier-terser": "^7.2.0",
 		"husky": "^9.1.7",

tools/server.js

@@ -2,8 +2,9 @@ import fs from "node:fs";
 import http from "node:http";
 import path from "node:path";
 import os from "node:os";
+import getPort from "get-port";
 
-const port = 3006;
+const port = await getPort({ port: 3000 });
 
 const mimeTypes = {
 	".bmp": "image/bmp",