33 lines
1.0 KiB
TypeScript
33 lines
1.0 KiB
TypeScript
import dns from "node:dns";
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/**
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* Node-only：强制优先 / 仅用 IPv4，避免 Cloudflare AAAA ENETUNREACH
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* 与 Happy Eyeballs 并行试 IPv6 时刷 AggregateError。
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*/
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dns.setDefaultResultOrder("ipv4first");
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const nativeLookup = dns.lookup.bind(dns) as (
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hostname: string,
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options?: unknown,
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callback?: unknown,
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) => unknown;
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// dns.lookup 重载签名在不同 @types/node 版本间不一致，这里按运行时重载包装。
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dns.lookup = ((hostname: string, options?: unknown, callback?: unknown) => {
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if (typeof options === "function") {
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return nativeLookup(hostname, { family: 4 }, options);
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}
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if (typeof callback === "function") {
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const opts =
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typeof options === "number"
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? { family: 4 }
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: { ...(options as object | undefined), family: 4 };
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return nativeLookup(hostname, opts, callback);
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}
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const opts =
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typeof options === "number"
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? { family: 4 }
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: { ...(options as object | undefined), family: 4 };
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return nativeLookup(hostname, opts);
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}) as typeof dns.lookup;
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