| let random = async bytes => crypto.getRandomValues(new Uint8Array(bytes)) | |
| let customAlphabet = (alphabet, defaultSize = 21) => { | |
| let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1 | |
| let step = -~((1.6 * mask * defaultSize) / alphabet.length) | |
| return async (size = defaultSize) => { | |
| if (size <= 0) return '' | |
| let id = '' | |
| while (true) { | |
| let bytes = crypto.getRandomValues(new Uint8Array(step)) | |
| let i = step | 0 | |
| 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 |= 0))) | |
| 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 } | |