diff --git a/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-param/output.json b/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-param/output.json
index c12044f25fea..453805884d68 100644
--- a/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-param/output.json
+++ b/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-param/output.json
@@ -30,7 +30,7 @@
           "extendsType": {
             "type": "TSFunctionType",
             "start":24,"end":53,"loc":{"start":{"line":1,"column":24,"index":24},"end":{"line":1,"column":53,"index":53}},
-            "parameters": [
+            "params": [
               {
                 "type": "Identifier",
                 "start":25,"end":47,"loc":{"start":{"line":1,"column":25,"index":25},"end":{"line":1,"column":47,"index":47},"identifierName":"x"},
@@ -81,7 +81,7 @@
                 }
               }
             ],
-            "typeAnnotation": {
+            "returnType": {
               "type": "TSTypeAnnotation",
               "start":49,"end":53,"loc":{"start":{"line":1,"column":49,"index":49},"end":{"line":1,"column":53,"index":53}},
               "typeAnnotation": {
diff --git a/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-return/output.json b/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-return/output.json
index a73a42f0f0c1..9e144e4cb05a 100644
--- a/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-return/output.json
+++ b/packages/babel-parser/test/fixtures/typescript/regression/nested-extends-in-arrow-type-return/output.json
@@ -30,8 +30,8 @@
           "extendsType": {
             "type": "TSFunctionType",
             "start":24,"end":49,"loc":{"start":{"line":1,"column":24,"index":24},"end":{"line":1,"column":49,"index":49}},
-            "parameters": [],
-            "typeAnnotation": {
+            "params": [],
+            "returnType": {
               "type": "TSTypeAnnotation",
               "start":27,"end":49,"loc":{"start":{"line":1,"column":27,"index":27},"end":{"line":1,"column":49,"index":49}},
               "typeAnnotation": {
diff --git a/packages/babel-parser/test/helpers/run-fixture-tests.js b/packages/babel-parser/test/helpers/run-fixture-tests.js
index 8d247a5fb54b..9719ba02ad4a 100644
--- a/packages/babel-parser/test/helpers/run-fixture-tests.js
+++ b/packages/babel-parser/test/helpers/run-fixture-tests.js
@@ -113,7 +113,7 @@ function runParseTest(parse, test, onlyCompareErrors) {
   // store for each error in the `errors` array. In both cases, we should
   // serialize the full error to be able to property test locations,
   // reasonCodes, etc.
-  const throws = !!actual.threw && actual.threw.message;
+  const throws = actual.threw ? actual.threw.message : undefined;
   const optionsLocation = join(testLocation, "options.json");
 
   // We want to throw away the contents of `throws` here.