Function action

action<TToken, TOptions>(f: ((data: Data<TToken, TOptions>, i: number) => void)): Matcher<TToken, TOptions, null>
Make a Matcher that always succeeds with null value, and performs an action / side effect without consuming input.

Use emit or make if you want to produce a result.

Use peek if you want to wrap another parser.
Type Parameters
- TToken
- TOptions
Parameters
- f: ((data: Data<TToken, TOptions>, i: number) => void)
  
  A function to produce a side effect (logging, etc).
  - - (data: Data<TToken, TOptions>, i: number): void
    - Parameters
      
      data: Data<TToken, TOptions>
      
      Data object (tokens and options).
      
      i: number
      
      Parser position in the tokens array.
      
      Returns void
Returns Matcher<TToken, TOptions, null>

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