description

# FormatException constructor Null safety

const FormatException(

1. [String message = "",
2. dynamic source,
3. int? offset]

)

Creates a new FormatException with an optional error `message`.

Optionally also supply the actual `source` with the incorrect format, and the `offset` in the format where a problem was detected.

## Implementation

    @pragma("vm:entry-point")
    const FormatException([this.message = "", this.source, this.offset]);