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Malte UblandClaude Opus 5.5
14ba361985
zod 4 defines its error message with Object.defineProperty(inst, "message",
{ get, set }). The typed-ref commit of an Error subclass read the accessor
as a data value and threw "expected string". The commit and the slot sync
now leave the slot alone and mark the property absent; typed reads and
writes of name and message call the accessor when the program reflects on
an untyped or Error-shaped target.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
44 lines
1.3 KiB
TypeScript
44 lines
1.3 KiB
TypeScript
// An accessor defined over an Error subclass instance's own `message`
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// (zod 4's lazy error message): typed reads and writes, String(), and
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// reads through an untyped alias all go through the accessor, and a later
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// data definition replaces it.
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class E extends Error {}
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const e = new E("orig");
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let store = "lazy";
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let reads = 0;
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Object.defineProperty(e, "message", {
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get() {
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reads++;
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return store;
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},
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set(value: string) {
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store = `set:${value}`;
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},
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enumerable: true,
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configurable: true,
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});
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console.log(e.message, String(e), reads);
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e.message = "typed";
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console.log(e.message, store);
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const loose: any = e;
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console.log(loose.message);
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loose.message = "loose";
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console.log(e.message, Object.keys(e).join());
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const desc = Object.getOwnPropertyDescriptor(e, "message")!;
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console.log(typeof desc.get, typeof desc.set, desc.enumerable);
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Object.defineProperty(e, "message", { value: "data", writable: true, configurable: true });
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console.log(e.message, String(e), reads);
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e.message = "after";
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console.log(e.message, store);
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class Named extends Error {}
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const n = new Named("m");
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const loosen: any = n;
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Object.defineProperty(loosen, "name", { get() { return "Custom"; }, configurable: true });
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console.log(n.name, String(n));
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class Plain extends Error {}
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const p = new Plain("kept");
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p.message = "changed";
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console.log(p.message, String(p));
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