hudozka/packages/utils/src/file.ts

const units = ["байт", "КБ", "МБ", "ГБ", "ТБ", "ПБ"]

const mime = new Map([
    ["application/pdf", "ПДФ"],
    ["image/jpeg", "ЖПГ"],
    ["image/png", "ПНГ"],
])

export function ext(mimeType: string): string {
    if (mime.has(mimeType)) {
        return mime.get(mimeType)!
    }

    return mimeType
}

export function size(bytes: number, precision = 1): string {
    if (Number.isNaN(bytes) || !Number.isFinite(bytes)) return ""

    const number = Math.floor(Math.log(bytes) / Math.log(1024))
    const size = (bytes / Math.pow(1024, Math.floor(number))).toFixed(precision)

    return `${size} ${units[number]}`
}