cal.pub0.org/packages/lib/i18n.ts

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/* eslint-disable @typescript-eslint/no-var-requires */
import parser from "accept-language-parser";
import type { IncomingMessage } from "http";
import type { Maybe } from "@calcom/trpc/server";
const { i18n } = require("@calcom/config/next-i18next.config");
export function getLocaleFromHeaders(req: IncomingMessage): string {
let preferredLocale: string | null | undefined;
if (req.headers["accept-language"]) {
preferredLocale = parser.pick(i18n.locales, req.headers["accept-language"]) as Maybe<string>;
}
return preferredLocale ?? i18n.defaultLocale;
}