| let random = async bytes => crypto.getRandomValues(new Uint8Array(bytes)) |
| let customAlphabet = (alphabet, size) => { |
| let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1 |
| let step = -~((1.6 * mask * size) / alphabet.length) |
| return async () => { |
| let id = '' |
| while (true) { |
| let bytes = crypto.getRandomValues(new Uint8Array(step)) |
| let i = step |
| while (i--) { |
| id += alphabet[bytes[i] & mask] || '' |
| if (id.length === size) return id |
| } |
| } |
| } |
| } |
| let nanoid = async (size = 21) => { |
| let id = '' |
| let bytes = crypto.getRandomValues(new Uint8Array(size)) |
| while (size--) { |
| let byte = bytes[size] & 63 |
| if (byte < 36) { |
| id += byte.toString(36) |
| } else if (byte < 62) { |
| id += (byte - 26).toString(36).toUpperCase() |
| } else if (byte < 63) { |
| id += '_' |
| } else { |
| id += '-' |
| } |
| } |
| return id |
| } |
| export { nanoid, customAlphabet, random } |