Variable function not being detected as functions

[d1820]

When a function is defined as a variable in arrow function format it is not being detected as a function

 private setCachedRoutes = (routes: Record<string, number[][]>): void => {

  };

This shows up in outline map as a variable. While technically that is true it is a bit misleading as its really a arrow function which as we all know helps preserve this

When looping over the file and detecting types search the whole line for => if its detected classify it as a function
OR
expose a regex rule map i can define my own detection