type FrameScope = {
  [key:string]: mixed
};
type StackFrame = {
  name?: string,
  fileName?: string,
  lineNumber?: number,
  columnNumber?: number,
  scope?: FrameScope
};
type StackFrames = Array<StackFrame>;
type ExtendedConsoleAPI = {
  ...ConsoleAPI,
  stack(frames: StackFrames) : void,
  endStack() : void
};