Fix TS object API generation of schema containing array of enumeration having no zero default (#8832)

* set the array constructor to fill with minvalue

* add regression generation test

Author: jtdavis777

src/idl_gen_ts.cpp

@@ -505,8 +505,12 @@ class TsGenerator : public BaseGenerator {
             std::string enum_name =
                 AddImport(imports, *value.type.enum_def, *value.type.enum_def)
                     .name;
-            std::string enum_value = namer_.Variant(
-                *value.type.enum_def->FindByValue(value.constant));
+            const EnumVal* val =
+                value.type.enum_def->FindByValue(value.constant);
+            if (val == nullptr) {
+              val = value.type.enum_def->MinValue();
+            }
+            std::string enum_value = namer_.Variant(*val);
             ret += enum_name + "." + enum_value +
                    (i < value.type.fixed_length - 1 ? ", " : "");
           }
@@ -521,9 +525,10 @@ class TsGenerator : public BaseGenerator {
           return "BigInt('" + value.constant + "')";
         }
         default: {
-          EnumVal* val = value.type.enum_def->FindByValue(value.constant);
-          if (val == nullptr)
-            val = const_cast<EnumVal*>(value.type.enum_def->MinValue());
+          const EnumVal* val = value.type.enum_def->FindByValue(value.constant);
+          if (val == nullptr) {
+            val = value.type.enum_def->MinValue();
+          }
           return AddImport(imports, *value.type.enum_def, *value.type.enum_def)
                      .name +
                  "." + namer_.Variant(*val);

tests/non_zero_enum.fbs

@@ -0,0 +1,12 @@
+enum NonZero: ubyte {
+    VAL = 1,
+}
+
+struct NonZeroArrayStruct {
+    data: [NonZero:4];
+}
+
+table NonZeroVectorTable {
+    values: [NonZero];
+    value: NonZero = VAL;
+}

tests/ts/TypeScriptTest.py

@@ -94,6 +94,11 @@ def esbuild(input, output):
     data="../unicode_test.json",
 )
 
+flatc(
+    options=["--ts", "--gen-object-api"],
+    schema="../non_zero_enum.fbs",
+)
+
 flatc(
     options=[
         "--ts",