Missing maxHeaderSize breaks Undici

[lukahartwig]

Version: Deno 1.42.2

Using Undici fetch breaks in Deno due to an incompatibility with node:http.

Example

// main.ts
import { fetch } from "npm:undici";
const response = await fetch("https://www.google.com");
console.log("response", response);

Output

deno run -A main.ts

error: Uncaught (in promise) TypeError: fetch failed
    at fetch (file:///Users/lukahartwig/Library/Caches/deno/npm/registry.npmjs.org/undici/6.13.0/index.js:109:13)
    at eventLoopTick (ext:core/01_core.js:168:7)
    at async file:///Users/lukahartwig/repos/deno-blob/main.ts:3:18
Caused by: AssertionError
    at new AssertionError (ext:deno_node/assertion_error.ts:414:11)
    at toNode (node:assert:44:15)
    at assert (node:assert:61:3)
    at new Parser (file:///Users/lukahartwig/Library/Caches/deno/npm/registry.npmjs.org/undici/6.13.0/lib/dispatcher/client-h1.js:140:5)
    at connectH1 (file:///Users/lukahartwig/Library/Caches/deno/npm/registry.npmjs.org/undici/6.13.0/lib/dispatcher/client-h1.js:646:21)
    at eventLoopTick (ext:core/01_core.js:168:7)
    at async connect (file:///Users/lukahartwig/Library/Caches/deno/npm/registry.npmjs.org/undici/6.13.0/lib/dispatcher/client.js:449:11)

The issue seems to be that Undici asserts maxHeaderSize from node:http which is not defined in Deno.

import http from "node:http";

console.log(http.maxHeaderSize);
// Node -> 16384
// Bun -> 16384
// Deno -> undefined