1 | import { urlAlphabet } from './url-alphabet/index.js'
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2 | if (false) {
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3 | if (
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4 | typeof navigator !== 'undefined' &&
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5 | navigator.product === 'ReactNative' &&
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6 | typeof crypto === 'undefined'
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7 | ) {
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8 | throw new Error(
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9 | 'React Native does not have a built-in secure random generator. ' +
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10 | 'If you don’t need unpredictable IDs use `nanoid/non-secure`. ' +
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11 | 'For secure IDs, import `react-native-get-random-values` ' +
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12 | 'before Nano ID.'
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13 | )
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14 | }
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15 | if (typeof msCrypto !== 'undefined' && typeof crypto === 'undefined') {
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16 | throw new Error(
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17 | 'Import file with `if (!window.crypto) window.crypto = window.msCrypto`' +
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18 | ' before importing Nano ID to fix IE 11 support'
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19 | )
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20 | }
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21 | if (typeof crypto === 'undefined') {
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22 | throw new Error(
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23 | 'Your browser does not have secure random generator. ' +
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24 | 'If you don’t need unpredictable IDs, you can use nanoid/non-secure.'
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25 | )
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26 | }
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27 | }
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28 | let random = bytes => crypto.getRandomValues(new Uint8Array(bytes))
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29 | let customRandom = (alphabet, size, getRandom) => {
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30 | let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
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31 | let step = -~((1.6 * mask * size) / alphabet.length)
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32 | return () => {
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33 | let id = ''
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34 | while (true) {
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35 | let bytes = getRandom(step)
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36 | let j = step
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37 | while (j--) {
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38 | id += alphabet[bytes[j] & mask] || ''
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39 | if (id.length === size) return id
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40 | }
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41 | }
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42 | }
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43 | }
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44 | let customAlphabet = (alphabet, size) => customRandom(alphabet, size, random)
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45 | let nanoid = (size = 21) => {
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46 | let id = ''
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47 | let bytes = crypto.getRandomValues(new Uint8Array(size))
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48 | while (size--) {
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49 | let byte = bytes[size] & 63
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50 | if (byte < 36) {
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51 | id += byte.toString(36)
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52 | } else if (byte < 62) {
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53 | id += (byte - 26).toString(36).toUpperCase()
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54 | } else if (byte < 63) {
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55 | id += '_'
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56 | } else {
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57 | id += '-'
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58 | }
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59 | }
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60 | return id
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61 | }
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62 | export { nanoid, customAlphabet, customRandom, urlAlphabet, random }
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