24 lines
598 B
TypeScript
24 lines
598 B
TypeScript
import { randomBytes } from 'node:crypto';
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/**
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* A UUID version 7: 48 bits of Unix milliseconds followed by random bits, so ids sort by creation
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* time without carrying a MAC address the way version 1 does.
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*/
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export function uuidv7(): string {
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const bytes = randomBytes(16);
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bytes.writeUIntBE(Date.now(), 0, 6);
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bytes.writeUInt8((bytes.readUInt8(6) & 0x0F) | 0x70, 6);
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bytes.writeUInt8((bytes.readUInt8(8) & 0x3F) | 0x80, 8);
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const hex = bytes.toString('hex');
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return [
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hex.slice(0, 8),
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hex.slice(8, 12),
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hex.slice(12, 16),
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hex.slice(16, 20),
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hex.slice(20),
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].join('-');
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}
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