redis: RedisClient.parseURL throws 'Value of URL.prototype.hostname called on an incompatible receiver' (new node_url_1.URL(...) in @redis/client) #11121

Summary

With redis@6.1.0 compiled through perry.compilePackages, RedisClient.parseURL throws:

TypeError: Value of URL.prototype.hostname called on an incompatible receiver

In Node it returns the parsed options. This is the next blocker for createClient({ url }) once #11042 is fixed: #initiateOptions in the constructor calls parseOptions → parseURL. (Before the #11042 fix the constructor never got here, because new Client(options) ran the wrong parent constructor.)

No server is needed to reproduce it.

Repro

package.json:

{
  "dependencies": { "redis": "6.1.0" },
  "perry": {
    "compilePackages": ["redis", "@redis/client", "@redis/bloom", "@redis/json", "@redis/search", "@redis/time-series", "cluster-key-slot"],
    "allow": { "compilePackages": ["redis", "@redis/client", "@redis/bloom", "@redis/json", "@redis/search", "@redis/time-series", "cluster-key-slot"] }
  }
}

main.ts:

const { RedisClient } = require("@redis/client");
console.log(JSON.stringify(RedisClient.parseURL("redis://127.0.0.1:6379")));

• Node 26.5.1: {"socket":{"host":"127.0.0.1","tls":false,"port":6379}}
• Perry (origin/main d8f24f1, and the redis: EventEmitter validation throws "argument must be an instance of EventEmitter. Received type string ('error')" on connect #11042 fix branch): TypeError: Value of URL.prototype.hostname called on an incompatible receiver

The code involved (@redis/client/dist/lib/client/index.js) is:

const node_url_1 = require("node:url");
// … inside class RedisClient extends node_events_1.EventEmitter:
static parseURL(url) {
    const { hostname, port, protocol, username, password, pathname } = new node_url_1.URL(url), parsed = { … };

What was measured (probes edited into that module)

• new URL(url).hostname (the global): works.
• new node_url_1.URL(url), const U = node_url_1.URL; new U(url), and new node_url_1.URL("redis://x:1"): .hostname / .href throw the error above.
• node_url_1.URL === URL is true. Object.prototype.toString.call(obj) is [object URL], but obj instanceof URL is false. The getter guard (url/prototype.rs require_url_receiver → is_url_object_shape) rejects the receiver.

Narrowing (all tried in a scratch compilePackages package next to @redis/client)

• The same parseURL body in a small package (const node_url_1 = require("node:url") plus a function or a class extends EventEmitter) works. It also works with 8 preceding local requires, with __importDefault(require(...)), and after one @redis/client require.
• A package made of client/index.js's own prelude (the TS helpers, then its 22 requires in the original order, with relative paths rewritten to @redis/client/dist/lib/...) followed by a 6-line class … extends node_events_1.EventEmitter { static parseURL(url) { … new node_url_1.URL(url) … } } fails. It still fails with any one of five subsets of those requires removed.
• The same prelude with the node:* requires moved to the top passes. So do the full prelude with a plain function instead of the class, and a trimmed prelude (only node:events, errors, node:url) with the class.

So the trigger depends on the module's require prelude and graph, not only on the URL construction. I have not narrowed it further. It is not GC-related: it is deterministic.

Found while validating the fix for #11042 (unblocks removing the native redis/ioredis binding).