Function countCharsFromStart

countCharsFromStart(source: string, ...chars: readonly string[]): number
Counts the number of times one of chars appears at the front of a string, contiguously.
```
countCharsFromStart(`  hi`, ` `); // 2
countCharsFromStart(`hi  `, ` `); // 0
countCharsFromStart(`  hi  `, ` `); // 2
```
Parameters
- source: string
- ...chars: readonly string[]
Returns number