Function error

error<TToken, TOptions>(message: string | ((data: Data<TToken, TOptions>, i: number) => string)): Matcher<TToken, TOptions, never>
Make a Matcher that throws an error if reached.

Use with caution!

Use fail if parser can step back and try a different path.

For error recovery you can try to encode erroneous state in an output value instead.
Type Parameters
- TToken
- TOptions
Parameters
- message: string | ((data: Data<TToken, TOptions>, i: number) => string)
  
  The message or a function to construct it from the current parser state.
Returns Matcher<TToken, TOptions, never>