AstralRinth/apps/frontend/src/composables/compact-number.ts

const formatters = new WeakMap<object, Intl.NumberFormat>()

export function useCompactNumber(truncate = false, fractionDigits = 2, locale?: string) {
	const context = {}

	let formatter = formatters.get(context)

	if (!formatter) {
		formatter = new Intl.NumberFormat(locale, {
			notation: 'compact',
			maximumFractionDigits: fractionDigits,
		})
		formatters.set(context, formatter)
	}

	function format(value: number): string {
		let formattedValue = value
		if (truncate) {
			const scale = Math.pow(10, fractionDigits)
			formattedValue = Math.floor(value * scale) / scale
		}
		return formatter!.format(formattedValue)
	}

	return format
}