Function parseSize

parseSize(value: string): undefined | number
Parses size string to bytes.
Parameters
- value: string
Returns undefined | number
parsed bytes, or undefined if the input doesn't match <number> <unit> or the unit is unknown
Example
```
parseSize('15.53 MB')      // 16288832
parseSize('zero bytes')    // undefined
parseSize('10 zorps')      // undefined
```
- Defined in src/files.ts:37