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const hasIntl = typeof Intl === 'object' && !!Intl
const Collator = hasIntl && Intl.Collator
const cache = new Map()
const collatorCompare = (locale, opts) => {
const collator = new Collator(locale, opts)
return (a, b) => collator.compare(a, b)
}
const localeCompare = (locale, opts) => (a, b) => a.localeCompare(b, locale, opts)
const knownOptions = [
'sensitivity',
'numeric',
'ignorePunctuation',
'caseFirst',
]
const { hasOwnProperty } = Object.prototype
module.exports = (locale, options = {}) => {
if (!locale || typeof locale !== 'string')
throw new TypeError('locale required')
const opts = knownOptions.reduce((opts, k) => {
if (hasOwnProperty.call(options, k)) {
opts[k] = options[k]
}
return opts
}, {})
const key = `${locale}\n${JSON.stringify(opts)}`
if (cache.has(key))
return cache.get(key)
const compare = hasIntl
? collatorCompare(locale, opts)
: localeCompare(locale, opts)
cache.set(key, compare)
return compare
}