Unusual crash on every 2nd invocation when using t.Intersect and t.RegExp global validation

[EvHaus]

I came across a really strange bug. It took me a long time to narrow it down to a minimal repro, so please let me know if anything below is unclear.

Using:

• elysia v1.1.5
• @elysiajs/eden v1.1.2

The Bug

Using treaty on a very simple endpoint works, but only for the first call. Every second call to this endpoint will fail (even if all incoming parameters & conditions are the same).

const api = treaty(app);

await api.foo.patch({ num: '5' }); // This works
await api.foo.patch({ num: '5' }); // This fails
await api.foo.patch({ num: '5' }); // This works
await api.foo.patch({ num: '5' }); // This fails
// etc...

The failure

For the invocations which fail, the stack trace is:

1 | var s=class extends Error{constructor(e,n){super(n+"");this.status=e;this.value=n}};var i=/(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d+([+-][0-2]\d:[0-5]\d|Z))|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d([+-][0-2]\d:[0-5]\d|Z))|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d([+-][0-2]\d:[0-5]\d|Z))/,o=/(?:Sun|Mon|Tue|Wed|Thu|Fri|Sat)\s(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s\d{2}\s\d{4}\s\d{2}:\d{2}:\d{2}\sGMT(?:\+|-)\d{4}\s\([^)]+\)/,c=/^(?:(?:(?:(?:0?[1-9]|[12][0-9]|3[01])[/\s-](?:0?[1-9]|1[0-2])[/\s-](?:19|20)\d{2})|(?:(?:19|20)\d{2}[/\s-](?:0?[1-9]|1[0-2])[/\s-](?:0?[1-9]|[12][0-9]|3[01]))))(?:\s(?:1[012]|0?[1-9]):[0-5][0-9](?::[0-5][0-9])?(?:\s[AP]M)?)?$/,u=t=>t.trim().length!==0&&!Number.isNaN(Number(t)),d=t=>{if(typeof t!="string")return null;let r=t.replace(/"/g,"");if(i.test(r)||o.test(r)||c.test(r)){let e=new Date(r);if(!Number.isNaN(e.getTime()))return e}return null},a=t=>{let r=t.charCodeAt(0),e=t.charCodeAt(t.length-1);return r===123&&e===125||r===91&&e===93},p=t=>JSON.parse(t,(r,e)=>{ | ... truncated

error: [object Object]
      at new s (/myproject/node_modules/.pnpm/@[email protected][email protected]_@[email protected][email protected]_/node_modules/@elysiajs/eden/dist/chunk-XYW4OUFN.mjs:1:44)
      at /myproject/node_modules/.pnpm/@[email protected][email protected]_@[email protected][email protected]_/node_modules/@elysiajs/eden/dist/chunk-7WO4HTSU.mjs:1:4302

Conditions

To reproduce this bug you'll need to create an endpoint with the following body schema validation:

import { Elysia, t } from 'elysia';

const app = new Elysia().patch(
	'/foo',
	() => ({ done: true }),
	{
		body: t.Intersect([
			t.Object({
				num: t.Optional(
					// Any digit 
					t.RegExp(/\d/g),
				),
			}),
			t.Object({}),
		]),
	},
);

export default app;

This bug only happens if using t.Intersect() and t.Optional() and t.RegExp() (any regex pattern will do). Removing any of these elements, makes the issue go away. Also interestingly, removing the g flag on the RegExp pattern also makes the issue go away.

Because of this behaviour, I can't quite tell if the issue is in elysia or @elysiajs/eden or typebox. Based on the stacktrace, I'm thinking Eden, but I'm not 100% sure.