fix(traverse): only visit paths, not nodes

Traversing nodes detaches the resulting paths from the root File node, so they can end up crashing getFlowType which needs to grab the source code from the File.

Author: motiz88

src/utils/resolveToValue.js

@@ -75,7 +75,7 @@ function findScopePath(paths: Array<NodePath>, path: NodePath): ?NodePath {
 function findLastAssignedValue(scope, name) {
   const results = [];
 
-  traverseShallow(scope.path.node, {
+  traverseShallow(scope.path, {
     visitAssignmentExpression: function(path) {
       const node = path.node;
       // Skip anything that is not an assignment to a variable with the

src/utils/traverse.js

@@ -16,10 +16,10 @@ type Visitor = (path: NodePath) => any;
  * default.
  */
 export function traverseShallow(
-  ast: ASTNode,
+  path: NodePath,
   visitors: { [key: string]: Visitor },
 ): void {
-  visit(ast, { ...defaultVisitors, ...visitors });
+  visit(path, { ...defaultVisitors, ...visitors });
 }
 
 const ignore = () => false;