1 files changed, 5 insertions, 3 deletions

diff --git a/tools/node_modules/eslint/node_modules/@babel/types/lib/modifications/flow/removeTypeDuplicates.js b/tools/node_modules/eslint/node_modules/@babel/types/lib/modifications/flow/removeTypeDuplicates.js
index 3d3347bb91..c2335205d4 100644
--- a/tools/node_modules/eslint/node_modules/@babel/types/lib/modifications/flow/removeTypeDuplicates.js
+++ b/tools/node_modules/eslint/node_modules/@babel/types/lib/modifications/flow/removeTypeDuplicates.js
@@ -8,7 +8,8 @@ var _generated = require("../../validators/generated");
 function getQualifiedName(node) {
   return (0, _generated.isIdentifier)(node) ? node.name : `${node.id.name}.${getQualifiedName(node.qualification)}`;
 }
-function removeTypeDuplicates(nodes) {
+function removeTypeDuplicates(nodesIn) {
+  const nodes = Array.from(nodesIn);
   const generics = new Map();
   const bases = new Map();
   const typeGroups = new Set();
@@ -28,7 +29,7 @@ function removeTypeDuplicates(nodes) {
     }
     if ((0, _generated.isUnionTypeAnnotation)(node)) {
       if (!typeGroups.has(node.types)) {
-        nodes = nodes.concat(node.types);
+        nodes.push(...node.types);
         typeGroups.add(node.types);
       }
       continue;
@@ -39,7 +40,8 @@ function removeTypeDuplicates(nodes) {
         let existing = generics.get(name);
         if (existing.typeParameters) {
           if (node.typeParameters) {
-            existing.typeParameters.params = removeTypeDuplicates(existing.typeParameters.params.concat(node.typeParameters.params));
+            existing.typeParameters.params.push(...node.typeParameters.params);
+            existing.typeParameters.params = removeTypeDuplicates(existing.typeParameters.params);
           }
         } else {
           existing = node.typeParameters;