flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/utils/getRootDir.js

@@ -0,0 +1,54 @@
+'use strict';
+
+const path = require('path');
+
+function getRootDir(files) {
+  let cur = null;
+
+  var _iteratorNormalCompletion = true;
+  var _didIteratorError = false;
+  var _iteratorError = undefined;
+
+  try {
+    for (var _iterator = files[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+      let file = _step.value;
+
+      let parsed = path.parse(file);
+      if (!cur) {
+        cur = parsed;
+      } else if (parsed.root !== cur.root) {
+        // bail out. there is no common root.
+        // this can happen on windows, e.g. C:\foo\bar vs. D:\foo\bar
+        return process.cwd();
+      } else {
+        // find the common path parts.
+        let curParts = cur.dir.split(path.sep);
+        let newParts = parsed.dir.split(path.sep);
+        let len = Math.min(curParts.length, newParts.length);
+        let i = 0;
+        while (i < len && curParts[i] === newParts[i]) {
+          i++;
+        }
+
+        cur.dir = i > 1 ? curParts.slice(0, i).join(path.sep) : cur.root;
+      }
+    }
+  } catch (err) {
+    _didIteratorError = true;
+    _iteratorError = err;
+  } finally {
+    try {
+      if (!_iteratorNormalCompletion && _iterator.return) {
+        _iterator.return();
+      }
+    } finally {
+      if (_didIteratorError) {
+        throw _iteratorError;
+      }
+    }
+  }
+
+  return cur ? cur.dir : process.cwd();
+}
+
+module.exports = getRootDir;