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Malte UblandClaude Opus 5.5
dd0c255fa7
`JSON.stringify(new Url(...))` was refused (SC1090) for every program class, although JSON.stringify of a class with a toJSON hook serializes whatever toJSON(key) returns. A class whose chain declares toJSON now crosses into the runtime JSON walker through its checked-dynamic class view, which calls the hook with the root key "" and handles nested hooks; an undefined hook result keeps the dyn-root undefined rule. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
45 lines
1.2 KiB
TypeScript
45 lines
1.2 KiB
TypeScript
// JSON.stringify of a class instance whose class (or a base) declares
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// toJSON serializes what toJSON(key) returns: the root key is "", nested
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// hooks run through the same walker, and a toJSON answering undefined
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// makes the whole result undefined.
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class Url {
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href: string;
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constructor(href: string) {
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this.href = href;
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}
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toJSON(): string {
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return this.href;
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}
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}
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class NextUrl extends Url {
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base = "ignored";
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}
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class Keyed {
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toJSON(key: string): { key: string; at: Url[] } {
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return { key, at: [new Url("n")] };
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}
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}
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class Missing {
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toJSON(): undefined {
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return undefined;
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}
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}
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console.log(JSON.stringify(new Url("http://x/")));
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console.log(JSON.stringify(new NextUrl("http://y/")));
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console.log(JSON.stringify(new Keyed()));
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console.log(JSON.stringify(new Keyed(), null, 2));
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function serialize(value: Missing): string {
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const text = JSON.stringify(value);
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return text === undefined ? "undefined result" : `text ${text}`;
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}
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console.log(serialize(new Missing()), JSON.stringify(new Missing()) === undefined);
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let calls = 0;
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class Counted {
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toJSON(): number {
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calls++;
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return calls;
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}
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}
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const c = new Counted();
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console.log(JSON.stringify(c), JSON.stringify(c), calls);
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