Function isSuccess

isSuccess<T>(result): result is ParserSuccess<T>
This typed function is helpful in filtering out the successes from an array of results while preserving type information. For example:
```
// type is ParserSuccess[]
results.filter(isSuccess);

// type is ParserResult[]
results.filter(r => r.success);
```
Type Parameters
- T
Parameters
- result: ParserResult<T>
  
  a parser result
Returns result is ParserSuccess<T>
- true if the result is a success, otherwise false

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