Can anyone please share a document which enlists all formulas supported by formula.js library
Sure @amol
here it is https://github.com/handsontable/formula-parser/blob/develop/src/supported-formulas.js
Thanks 
Is there any help document which lists Formula - Operators / Parameters ?
Unfortunately, we do not have a complete list of those. I think that the best way would be to check the Excel formulas - the syntax is the same.