Function collationForComparison

packages/intl-collator/compare.ts:98–113

(locale: string, collation: string)

}

function collationForComparison(locale: string, collation: string): string {
  if (collation !== 'default') {
    return collation
  }
  // LDML Collation Type Fallback uses the locale's <defaultCollation> when
  // ECMA-402 resolvedOptions exposes "default" for the collation slot.
  // https://www.unicode.org/reports/tr35/tr35-collation.html#Collation_Type_Fallback
  return (
    (
      collationLocaleData as Record<
        string,
        {defaultCollation?: string} | undefined
      >
    )[locale]?.defaultCollation || collation
  )
}

function normalizeTailoringValue(value: string): string {
  return normalize(value)