var random = require('./random')
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var url = require('../url')
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/**
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* Generate secure URL-friendly unique ID. Non-blocking version.
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*
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* By default, ID will have 21 symbols to have a collision probability similar
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* to UUID v4.
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*
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* @param {number} [size=21] The number of symbols in ID.
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*
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* @return {Promise} Promise with random string.
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*
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* @example
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* const nanoidAsync = require('nanoid/async')
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* nanoidAsync.then(id => {
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* model.id = id
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* })
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*
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* @name async
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* @function
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*/
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module.exports = function (size) {
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size = size || 21
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return random(size).then(function (bytes) {
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var id = ''
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while (0 < size--) {
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id += url[bytes[size] & 63]
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}
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return id
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})
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}
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