Beispiel

Demonstrate that core-js 3.50 captures the built-in URL.prototype.toString when installing a missing URL.prototype.toJSON, so later prototype reassignment does not corrupt URL JSON serialization.

sha256:771727fb4ca310f83f1ec90c4a2f32315fedc9adae20af901d39e2e339f493f2

Fall

Ziel

Demonstrate that core-js 3.50 captures the built-in URL.prototype.toString when installing a missing URL.prototype.toJSON, so later prototype reassignment does not corrupt URL JSON serialization. HOW

Pakete

core-js 3.50.0

Umgebung

node

Erstellt

2026-08-17T01:49:38Z

Häufige Annahme

A core-js-provided URL.prototype.toJSON dynamically calls the current URL.prototype.toString, so reassigning toString later also changes toJSON output.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• When the host URL.prototype.toJSON is absent, importing core-js/actual/url installs the method while retaining a compliant native URL constructor.
• The installed toJSON serializes an opaque mailto URL as mailto:sample-user and its pathname remains sample-user.
• After URL.prototype.toString is reassigned, String(url) observes the replacement but url.toJSON() still returns the original serialized URL.

Dateien

• csx.json
• package-lock.json
• package.json
• test/contract.cjs

Verifiziertes Artefakt herunterladen (tar.gz) — genau die Bytes, gegen die der Contract lief

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9