This is a utility, which allows a function to figure out from which file it was invoked. It does so by inspecting v8's stack trace at the time it is invoked.
Inspired by http://stackoverflow.com/questions/13227489
note: this relies on Node/V8 specific APIs, as such other runtimes may not work
bash
yarn add get-caller-file
Given:
```js // ./foo.js const getCallerFile = require('get-caller-file');
module.exports = function() { return getCallerFile(); // figures out who called it }; ```
```js // index.js const foo = require('./foo');
foo() // => /full/path/to/this/file/index.js ```
getCallerFile(position = 2)
: where position is stack frame whos fileName we want.