module: fix for empty object in InternalModuleReadJSON

Fixes: #30245
PR-URL: #30256
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Jan Krems <[email protected]>

Author: guybedford

src/env.h

@@ -214,6 +214,7 @@ constexpr size_t kFsStatsBufferLength =
   V(done_string, "done")                                                       \
   V(duration_string, "duration")                                               \
   V(emit_warning_string, "emitWarning")                                        \
+  V(empty_object_string, "{}")                                                 \
   V(encoding_string, "encoding")                                               \
   V(entries_string, "entries")                                                 \
   V(entry_type_string, "entryType")                                            \

src/node_file.cc

@@ -18,7 +18,6 @@
 // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
-
 #include "node_file.h"
 #include "aliased_buffer.h"
 #include "memory_tracker-inl.h"
@@ -787,7 +786,7 @@ static void InternalModuleReadJSON(const FunctionCallbackInfo<Value>& args) {
     size == SearchString(&chars[start], size, "\"main\"") &&
     size == SearchString(&chars[start], size, "\"exports\"") &&
     size == SearchString(&chars[start], size, "\"type\""))) {
-    return;
+    args.GetReturnValue().Set(env->empty_object_string());
   } else {
     Local<String> chars_string =
         String::NewFromUtf8(isolate,

test/es-module/test-esm-default-type.mjs

@@ -0,0 +1,8 @@
+// Flags: --experimental-modules
+import '../common/index.mjs';
+import { strictEqual } from 'assert';
+
+import asdf from
+  '../fixtures/es-modules/package-type-module/nested-default-type/module.js';
+
+strictEqual(asdf, 'asdf');

test/fixtures/es-modules/package-type-module/nested-default-type/module.js

@@ -0,0 +1 @@
+module.exports = 'asdf';

test/fixtures/es-modules/package-type-module/nested-default-type/package.json

@@ -0,0 +1 @@
+{}

test/parallel/test-module-binding.js

@@ -8,9 +8,8 @@ const { readFileSync } = require('fs');
 const { strictEqual } = require('assert');
 
 strictEqual(internalModuleReadJSON('nosuchfile'), undefined);
-strictEqual(internalModuleReadJSON(fixtures.path('empty.txt')), undefined);
-strictEqual(internalModuleReadJSON(fixtures.path('empty-with-bom.txt')),
-            undefined);
+strictEqual(internalModuleReadJSON(fixtures.path('empty.txt')), '{}');
+strictEqual(internalModuleReadJSON(fixtures.path('empty-with-bom.txt')), '{}');
 {
   const filename = fixtures.path('require-bin/package.json');
   strictEqual(internalModuleReadJSON(filename), readFileSync(filename, 'utf8'));