多个js函数文件的单个intellisense文件？

I have functions1.js, functions2.js and functions3.js. Each has a function, funcA, funcB and funcC respectively. I created a file called "functions.intellisense.js" and added it to _reference.js. I then added a reference to _reference.js in my test.js file.I have functions1.js, functions2.js and functio