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Malte UblandClaude Opus 5.5
def4626396
`h.getSetCookie?.()` on a native Headers handle failed with SC2020: the optional-chain lowering first reads the callee as a value, and native handle methods have no first-class value. A required standard-library method on a never-nullish receiver always exists, so `?.()` is the plain call. When that method read has no lowering, the optional chain now re-dispatches the plain call. Reads that lower keep the existing path unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
29 lines
885 B
TypeScript
29 lines
885 B
TypeScript
// An optional call of a standard-library method that always exists on a
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// never-nullish receiver is the plain call (`getSetCookie?.()` is always
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// present on Node 24).
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const h = new Headers();
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h.append("set-cookie", "a=1");
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h.append("set-cookie", "b=2");
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const cookies = h.getSetCookie?.() ?? [];
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console.log(JSON.stringify(cookies));
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console.log(h.get?.("set-cookie"));
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console.log(h.has?.("x-missing"));
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h.set?.("x-set", "1");
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h.forEach?.((value, name) => console.log(`${name}=${value}`));
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// The receiver evaluates once; arguments evaluate after it.
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let reads = 0;
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function headers(): Headers {
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reads++;
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return h;
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}
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function arg(): string {
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console.log("argument after receiver", reads);
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return "x-set";
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}
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console.log(headers().get?.(arg()), reads);
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// Strings and arrays: the same rule.
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const s = "Hello";
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console.log(s.toUpperCase?.(), [3, 1, 2].sort?.().join(","));
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