--- /dev/null
+'use strict';
+const callsites = require('callsites');
+
+module.exports = filepath => {
+ const stacks = callsites();
+
+ if (!filepath) {
+ return stacks[2].getFileName();
+ }
+
+ let seenVal = false;
+
+ // Skip the first stack as it's this function
+ stacks.shift();
+
+ for (const stack of stacks) {
+ const parentFilepath = stack.getFileName();
+
+ if (typeof parentFilepath !== 'string') {
+ continue;
+ }
+
+ if (parentFilepath === filepath) {
+ seenVal = true;
+ continue;
+ }
+
+ // Skip native modules
+ if (parentFilepath === 'module.js') {
+ continue;
+ }
+
+ if (seenVal && parentFilepath !== filepath) {
+ return parentFilepath;
+ }
+ }
+};