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27 lines
966 B
TypeScript
27 lines
966 B
TypeScript
import { init, createId } from "@paralleldrive/cuid2";
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import config from "@/config/index.js";
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const TIME2000 = 946684800000;
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const TIMESTAMP_LENGTH = 8;
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const length =
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Math.min(Math.max(config.cuid?.length ?? 16, 16), 24) - TIMESTAMP_LENGTH;
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const fingerprint = `${config.cuid?.fingerprint ?? ""}${createId()}`;
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const genCuid2 = init({ length, fingerprint });
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/**
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* The generated ID results in the form of `[8 chars timestamp] + [cuid2]`.
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* The minimum and maximum lengths are 16 and 24, respectively.
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* With the length of 16, namely 8 for cuid2, roughly 1427399 IDs are needed
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* in the same millisecond to reach 50% chance of collision.
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*
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* Ref: https://github.com/paralleldrive/cuid2#parameterized-length
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*/
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export function genId(date?: Date): string {
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const now = (date ?? new Date()).getTime();
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const time = Math.max(now - TIME2000, 0);
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const timestamp = time.toString(36).padStart(TIMESTAMP_LENGTH, "0");
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return `${timestamp}${genCuid2()}`;
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}
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