// From https://github.com/skeeto/ulid-js/blob/master/ulid.js export let ulid = () => { const BASE32 = [ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "M", "N", "P", "Q", "R", "S", "T", "V", "W", "X", "Y", "Z", ]; let last = -1; /* Pre-allocate work buffers / views */ let ulid = new Uint8Array(16); let time = new DataView(ulid.buffer, 0, 6); let rand = new Uint8Array(ulid.buffer, 6, 10); let dest = new Array(26); function encode(ulid) { dest[0] = BASE32[ulid[0] >> 5]; dest[1] = BASE32[(ulid[0] >> 0) & 0x1f]; for (let i = 0; i < 3; i++) { dest[i * 8 + 2] = BASE32[ulid[i * 5 + 1] >> 3]; dest[i * 8 + 3] = BASE32[((ulid[i * 5 + 1] << 2) | (ulid[i * 5 + 2] >> 6)) & 0x1f]; dest[i * 8 + 4] = BASE32[(ulid[i * 5 + 2] >> 1) & 0x1f]; dest[i * 8 + 5] = BASE32[((ulid[i * 5 + 2] << 4) | (ulid[i * 5 + 3] >> 4)) & 0x1f]; dest[i * 8 + 6] = BASE32[((ulid[i * 5 + 3] << 1) | (ulid[i * 5 + 4] >> 7)) & 0x1f]; dest[i * 8 + 7] = BASE32[(ulid[i * 5 + 4] >> 2) & 0x1f]; dest[i * 8 + 8] = BASE32[((ulid[i * 5 + 4] << 3) | (ulid[i * 5 + 5] >> 5)) & 0x1f]; dest[i * 8 + 9] = BASE32[(ulid[i * 5 + 5] >> 0) & 0x1f]; } return dest.join(""); } return function () { let now = Date.now(); if (now === last) { /* 80-bit overflow is so incredibly unlikely that it's not * considered as a possiblity here. */ for (let i = 9; i >= 0; i--) if (rand[i]++ < 255) break; } else { last = now; time.setUint16(0, (now / 4294967296.0) | 0); time.setUint32(2, now | 0); window.crypto.getRandomValues(rand); } return encode(ulid); }; };

josephscott