export declare enum BytesUnit {
    KB = 1024,
    MB = 1048576,
    GB = 1073741824,
    TB = 1099511627776
}
/** ## `bytes_to` : 将bytes数据转化成可读数据形式
+ 默认只显示三位小数
@example Usage
```ts
  const kb = bytes_to(1023, BytesUnit.KB)
  const kb1 = bytes_to('1024', BytesUnit.KB)
  const mb = bytes_to(1024 * 1024, BytesUnit.MB)
  const gb = bytes_to(1024 * 1024 * 1024, BytesUnit.GB)

  assert(equal('0.999KB', kb))
  assert(equal('1KB', kb1))
  assert(equal('1MB', mb))
  assert(equal('1GB', gb))
```
@category format
  */
export declare function bytes_to(bytes: number | string, unit: BytesUnit): string;
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