relay-runtime-deferred-data-in-initial-response.diff

diff --git a/node_modules/relay-runtime/lib/store/RelayResponseNormalizer.js b/node_modules/relay-runtime/lib/store/RelayResponseNormalizer.js
index b9994b3..e970570 100644
--- a/node_modules/relay-runtime/lib/store/RelayResponseNormalizer.js
+++ b/node_modules/relay-runtime/lib/store/RelayResponseNormalizer.js
@@ -351,6 +351,7 @@ var RelayResponseNormalizer = /*#__PURE__*/function () {
 
     if (process.env.NODE_ENV !== "production") {
       process.env.NODE_ENV !== "production" ? warning(typeof isDeferred === 'boolean', 'RelayResponseNormalizer: Expected value for @defer `if` argument to ' + 'be a boolean, got `%s`.', isDeferred) : void 0;
+      invariant(defer.selections[0].kind === "InlineFragment" && defer.selections[0].selections.length > 0, "RelayResponseNormalizer: Expected @defer on InlineFragment with selections");
     }
 
     if (isDeferred === false) {
@@ -358,17 +359,25 @@ var RelayResponseNormalizer = /*#__PURE__*/function () {
       // normalize the data already present.
       this._traverseSelections(defer, record, data);
     } else {
-      // Otherwise data *for this selection* should not be present: enqueue
-      // metadata to process the subsequent response chunk.
-      this._incrementalPlaceholders.push({
-        kind: 'defer',
-        data: data,
-        label: defer.label,
-        path: (0, _toConsumableArray2["default"])(this._path),
-        selector: createNormalizationSelector(defer, RelayModernRecord.getDataID(record), this._variables),
-        typeName: RelayModernRecord.getType(record),
-        actorIdentifier: this._actorIdentifier
-      });
+      const isDeferredDataPresent = defer.selections[0].selections.every(sel => data[sel.name] !== undefined);
+      if (isDeferredDataPresent) {
+        // According to the spec, clients should use deferred data in the
+        // initial response, if it exists:
+        // https://github.com/graphql/graphql-spec/pull/742#discussion_r993838228
+        this._traverseSelections(defer, record, data);
+      } else {
+        // Otherwise data *for this selection* should not be present: enqueue
+        // metadata to process the subsequent response chunk.
+        this._incrementalPlaceholders.push({
+          kind: 'defer',
+          data: data,
+          label: defer.label,
+          path: (0, _toConsumableArray2["default"])(this._path),
+          selector: createNormalizationSelector(defer, RelayModernRecord.getDataID(record), this._variables),
+          typeName: RelayModernRecord.getType(record),
+          actorIdentifier: this._actorIdentifier
+        });
+      }
     }
   };