index.browser.js 971 B

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  1. let random = bytes =>
  2. Promise.resolve(crypto.getRandomValues(new Uint8Array(bytes)))
  3. let customAlphabet = (alphabet, size) => {
  4. let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
  5. let step = -~((1.6 * mask * size) / alphabet.length)
  6. return () => {
  7. let id = ''
  8. while (true) {
  9. let bytes = crypto.getRandomValues(new Uint8Array(step))
  10. let i = step
  11. while (i--) {
  12. id += alphabet[bytes[i] & mask] || ''
  13. if (id.length === size) return Promise.resolve(id)
  14. }
  15. }
  16. }
  17. }
  18. let nanoid = (size = 21) => {
  19. let id = ''
  20. let bytes = crypto.getRandomValues(new Uint8Array(size))
  21. while (size--) {
  22. let byte = bytes[size] & 63
  23. if (byte < 36) {
  24. id += byte.toString(36)
  25. } else if (byte < 62) {
  26. id += (byte - 26).toString(36).toUpperCase()
  27. } else if (byte < 63) {
  28. id += '_'
  29. } else {
  30. id += '-'
  31. }
  32. }
  33. return Promise.resolve(id)
  34. }
  35. export { nanoid, customAlphabet, random }