Looking for API of some build-in function

Hi,

I want to know where is the definition of some build-in functions of Construct 3. Example function: "DoCmp".

Exameple code:

"

CompareCurrentKey(cmp, frame)

{

return DoCmp(this.currentFrame(), cmp, frame);

}

"

If it's not documented or in the plugin SDK template, it's private code and not supported.