fix: clone node for signature, fixes #1268

Author: theKashey

Diff for: src/fresh/babel.js

@@ -202,7 +202,7 @@ export default function(babel) {
       key: fnHookCalls.map(call => call.name + '{' + call.key + '}').join('\n'),
       customHooks: fnHookCalls
         .filter(call => !isBuiltinHook(call.name))
-        .map(call => call.callee),
+        .map(call => t.clone(call.callee)),
     };
   }
 
@@ -217,7 +217,6 @@ export default function(babel) {
 
   let seenForRegistration = new WeakSet();
   let seenForSignature = new WeakSet();
-  let seenForOutro = new WeakSet();
 
   let hookCalls = new WeakMap();
   const HookCallsVisitor = {
@@ -291,7 +290,7 @@ export default function(babel) {
 
         // Make sure we're not mutating the same tree twice.
         // This can happen if another Babel plugin replaces parents.
-        if (seenForRegistration.has(node)) {
+          if (seenForRegistration.has(node)) {
           return;
         }
         seenForRegistration.add(node);
@@ -557,38 +556,6 @@ export default function(babel) {
           // but it's the best we can do until we stop transpiling destructuring.
           path.traverse(HookCallsVisitor);
         },
-        exit(path) {
-          return;
-          const registrations = registrationsByProgramPath.get(path);
-          if (registrations === undefined) {
-            return;
-          }
-
-          // Make sure we're not mutating the same tree twice.
-          // This can happen if another Babel plugin replaces parents.
-          const node = path.node;
-          if (seenForOutro.has(node)) {
-            return;
-          }
-          seenForOutro.add(node);
-          // Don't mutate the tree above this point.
-
-          registrationsByProgramPath.delete(path);
-          const declarators = [];
-          path.pushContainer('body', t.variableDeclaration('var', declarators));
-          registrations.forEach(({handle, persistentID}) => {
-            path.pushContainer(
-              'body',
-              t.expressionStatement(
-                t.callExpression(t.identifier('__register__'), [
-                  handle,
-                  t.stringLiteral(persistentID),
-                ]),
-              ),
-            );
-            declarators.push(t.variableDeclarator(handle));
-          });
-        },
       },
     },
   };

Diff for: test/__babel_fixtures__/hooks.js

@@ -36,6 +36,12 @@ const useCustomHook = () => {
   useExternalHook();
 };
 
+const useCustomHookAgain = () => {
+  useState(42);
+  useEffectHook();
+  useExternalHook();
+};
+
 function useFunc () {
   useState(42);
   useEffectHook();

Diff for: test/__snapshots__/babel.test.js.snap

@@ -1203,6 +1203,16 @@ __signature__(useCustomHook, 'useState{(42)}\\\\nuseEffectHook{}\\\\nuseExternal
   return [useEffectHook, _externalHook.useExternalHook];
 });
 
+var useCustomHookAgain = function useCustomHookAgain() {
+  (0, _react.useState)(42);
+  useEffectHook();
+  (0, _externalHook.useExternalHook)();
+};
+
+__signature__(useCustomHookAgain, 'useState{(42)}\\\\nuseEffectHook{}\\\\nuseExternalHook{}', function () {
+  return [useEffectHook, _externalHook.useExternalHook];
+});
+
 function useFunc() {
   (0, _react.useState)(42);
   useEffectHook();
@@ -1228,6 +1238,7 @@ __signature__(useFunc, 'useState{(42)}\\\\nuseEffectHook{}', function () {
   reactHotLoader.register(useForwardRefHook, 'useForwardRefHook', __FILENAME__);
   reactHotLoader.register(useForwardRefFunctionHook, 'useForwardRefFunctionHook', __FILENAME__);
   reactHotLoader.register(useCustomHook, 'useCustomHook', __FILENAME__);
+  reactHotLoader.register(useCustomHookAgain, 'useCustomHookAgain', __FILENAME__);
   reactHotLoader.register(useFunc, 'useFunc', __FILENAME__);
 })();
 
@@ -2260,6 +2271,14 @@ const useCustomHook = () => {
 
 __signature__(useCustomHook, 'useState{(42)}\\\\nuseEffectHook{}\\\\nuseExternalHook{}', () => [useEffectHook, _externalHook.useExternalHook]);
 
+const useCustomHookAgain = () => {
+  (0, _react.useState)(42);
+  useEffectHook();
+  (0, _externalHook.useExternalHook)();
+};
+
+__signature__(useCustomHookAgain, 'useState{(42)}\\\\nuseEffectHook{}\\\\nuseExternalHook{}', () => [useEffectHook, _externalHook.useExternalHook]);
+
 function useFunc() {
   (0, _react.useState)(42);
   useEffectHook();
@@ -2283,6 +2302,7 @@ __signature__(useFunc, 'useState{(42)}\\\\nuseEffectHook{}', () => [useEffectHoo
   reactHotLoader.register(useForwardRefHook, 'useForwardRefHook', __FILENAME__);
   reactHotLoader.register(useForwardRefFunctionHook, 'useForwardRefFunctionHook', __FILENAME__);
   reactHotLoader.register(useCustomHook, 'useCustomHook', __FILENAME__);
+  reactHotLoader.register(useCustomHookAgain, 'useCustomHookAgain', __FILENAME__);
   reactHotLoader.register(useFunc, 'useFunc', __FILENAME__);
 })();