在javascript中获取函数声明的路径

Question

For example, given

// foo.js
function bar() {
    ...
}

How can I implement a function such as

function getPathOf(func) {
    return ...
}
console.log(getPathOf(foo.bar)) // Prints: "foo.js:1:1"

That is to say, how can I get the source file path, line number, and column number of a given function.

I know Function.name gives the name of a function, and I have seen assertion libraries such as chai.js print the path to a function when printing a stack trace.

Answer 1

The only expression that exposes the current line number and file is new Error :

 console.log((new Error()).stack);

thats how the libraries generate stacktraces, there is no other way to get it.

---

I guess something like:

 fs.readFileSync("foo.js").indexOf(func.toString())

might work somehow but thats just ugly and serves no real purpose.