| // This alphabet uses `A-Za-z0-9_-` symbols. |
| // The order of characters is optimized for better gzip and brotli compression. |
| // References to the same file (works both for gzip and brotli): |
| // `'use`, `andom`, and `rict'` |
| // References to the brotli default dictionary: |
| // `-26T`, `1983`, `40px`, `75px`, `bush`, `jack`, `mind`, `very`, and `wolf` |
| let urlAlphabet = |
| 'useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict' |
| |
| let customAlphabet = (alphabet, defaultSize = 21) => { |
| return (size = defaultSize) => { |
| let id = '' |
| // A compact alternative for `for (var i = 0; i < step; i++)`. |
| let i = size | 0 |
| while (i--) { |
| // `| 0` is more compact and faster than `Math.floor()`. |
| id += alphabet[(Math.random() * alphabet.length) | 0] |
| } |
| return id |
| } |
| } |
| |
| let nanoid = (size = 21) => { |
| let id = '' |
| // A compact alternative for `for (var i = 0; i < step; i++)`. |
| let i = size | 0 |
| while (i--) { |
| // `| 0` is more compact and faster than `Math.floor()`. |
| id += urlAlphabet[(Math.random() * 64) | 0] |
| } |
| return id |
| } |
| |
| module.exports = { nanoid, customAlphabet } |