File "handle-plural-message-20260314162821.tsx"
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import memoize from 'nano-memoize';
import {MessageDescriptor} from './message-descriptor';
// this will get memoized by enclosing function (<Trans> or useTrans)
export function handlePluralMessage(
localeCode: string,
{message, values}: MessageDescriptor
): string {
// find plural config e.g. [one 1 item|other :count items]
const match = message.match(/\[(.+?)]/);
const count = values?.count;
if (match && match[1] && !Number.isNaN(count)) {
// get config without brackets and split by pipe e.g. [one 1 item, other :count items]
const [pluralPlaceholder, pluralConfig] = match;
const choices = pluralConfig.split('|');
if (!choices.length) return message;
// use Intl.PluralRules to determine which choice to use, based on special "count" value
const rules = getRules(localeCode);
const choiceName = rules.select(count as number);
// find the correct choice from config, or use first one
let choiceConfig = choices.find(c => {
return c.startsWith(choiceName);
});
if (!choiceConfig) {
choiceConfig = choices[0];
}
// get rid of plural prefix e.g. one 1 item => 1 item
const choice = choiceConfig.substring(choiceConfig.indexOf(' ') + 1);
return message.replace(pluralPlaceholder, choice);
}
return message;
}
const getRules = memoize((localeCode: string) => {
return new Intl.PluralRules(localeCode);
});