builder-util/out/ksuid.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.generateKsuid = generateKsuid;
const crypto_1 = require("crypto");
// KSUID custom epoch (May 13, 2014 in Unix seconds)
const KSUID_EPOCH = BigInt(1400000000);
const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
const BASE = BigInt(62);
/**
 * Generates a K-Sortable Unique Identifier (KSUID): a 27-char base62 string
 * encoding 4 bytes of timestamp + 16 bytes of random data.
 * Compatible with https://github.com/segmentio/ksuid
 */
function generateKsuid() {
    const ts = BigInt(Math.floor(Date.now() / 1000)) - KSUID_EPOCH;
    const buf = Buffer.allocUnsafe(20);
    buf.writeUInt32BE(Number(ts), 0);
    (0, crypto_1.randomBytes)(16).copy(buf, 4);
    return base62Encode(buf);
}
function base62Encode(buf) {
    let n = BigInt("0x" + buf.toString("hex"));
    let result = "";
    // 27 digits: ceil(160 / log2(62)) = 27
    for (let i = 0; i < 27; i++) {
        result = ALPHABET[Number(n % BASE)] + result;
        n /= BASE;
    }
    return result;
}
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