[core] Fix bugprone-too-small-loop-variable errors

As reported by clang-tidy-8.

3 files changed, 3 insertions, 3 deletions

diff --git a/platform/node/src/node_expression.cpp b/platform/node/src/node_expression.cpp
index f2feaf8ea4..b5e1b7d461 100644
--- a/platform/node/src/node_expression.cpp
+++ b/platform/node/src/node_expression.cpp
@@ -157,7 +157,7 @@ struct ToValue {
     v8::Local<v8::Value> operator()(const std::vector<Value>& array) {
         Nan::EscapableHandleScope scope;
         v8::Local<v8::Array> result = Nan::New<v8::Array>();
-        for (unsigned int i = 0; i < array.size(); i++) {
+        for (std::size_t i = 0; i < array.size(); i++) {
             result->Set(i, toJS(array[i]));
         }
         return scope.Escape(result);
diff --git a/platform/node/src/node_feature.cpp b/platform/node/src/node_feature.cpp
index 646cc23338..594c732b14 100644
--- a/platform/node/src/node_feature.cpp
+++ b/platform/node/src/node_feature.cpp
@@ -112,7 +112,7 @@ struct ToValue {
     v8::Local<v8::Value> operator()(const std::vector<mbgl::Value>& array) {
         Nan::EscapableHandleScope scope;
         v8::Local<v8::Array> result = Nan::New<v8::Array>();
-        for (unsigned int i = 0; i < array.size(); i++) {
+        for (std::size_t i = 0; i < array.size(); i++) {
             result->Set(i, toJS(array[i]));
         }
         return scope.Escape(result);
diff --git a/platform/node/src/node_map.cpp b/platform/node/src/node_map.cpp
index 550d3d594b..2be33150ec 100644
--- a/platform/node/src/node_map.cpp
+++ b/platform/node/src/node_map.cpp
@@ -1374,7 +1374,7 @@ void NodeMap::QueryRenderedFeatures(const Nan::FunctionCallbackInfo<v8::Value>&
         }
 
         auto array = Nan::New<v8::Array>();
-        for (unsigned int i = 0; i < optional.size(); i++) {
+        for (std::size_t i = 0; i < optional.size(); i++) {
             array->Set(i, toJS(optional[i]));
         }
         info.GetReturnValue().Set(array);