Function getRelativeTimeFormat

src/utils/intl.ts:56–67

(
  style: 'long' | 'short' | 'narrow',
  numeric: 'always' | 'auto',
)

const rtfCache = new Map<string, Intl.RelativeTimeFormat>()

export function getRelativeTimeFormat(
  style: 'long' | 'short' | 'narrow',
  numeric: 'always' | 'auto',
): Intl.RelativeTimeFormat {
  const key = `${style}:${numeric}`
  let rtf = rtfCache.get(key)
  if (!rtf) {
    rtf = new Intl.RelativeTimeFormat('en', { style, numeric })
    rtfCache.set(key, rtf)
  }
  return rtf
}

// Timezone is constant for the process lifetime
let cachedTimeZone: string | null = null