adde json map Get and Set helpers

tools/types/json_map.go

@@ -21,6 +21,22 @@ func (m JsonMap) MarshalJSON() ([]byte, error) {
 	return json.Marshal(alias(m))
 }
 
+// Get retrieves a single value from the current JsonMap.
+//
+// This helper was added primarily to assist the goja integration since custom map types
+// don't have direct access to the map keys (https://pkg.go.dev/github.com/dop251/goja#hdr-Maps_with_methods).
+func (m JsonMap) Get(key string) any {
+	return m[key]
+}
+
+// Set sets a single value in the current JsonMap.
+//
+// This helper was added primarily to assist the goja integration since custom map types
+// don't have direct access to the map keys (https://pkg.go.dev/github.com/dop251/goja#hdr-Maps_with_methods).
+func (m JsonMap) Set(key string, value any) {
+	m[key] = value
+}
+
 // Value implements the [driver.Valuer] interface.
 func (m JsonMap) Value() (driver.Value, error) {
 	data, err := json.Marshal(m)

tools/types/json_map_test.go

@@ -30,6 +30,46 @@ func TestJsonMapMarshalJSON(t *testing.T) {
 	}
 }
 
+func TestJsonMapGet(t *testing.T) {
+	scenarios := []struct {
+		json     types.JsonMap
+		key      string
+		expected any
+	}{
+		{nil, "test", nil},
+		{types.JsonMap{"test": 123}, "test", 123},
+		{types.JsonMap{"test": 123}, "missing", nil},
+	}
+
+	for i, s := range scenarios {
+		result := s.json.Get(s.key)
+		if result != s.expected {
+			t.Errorf("(%d) Expected %s, got %v", i, s.expected, result)
+		}
+	}
+}
+
+func TestJsonMapSet(t *testing.T) {
+	scenarios := []struct {
+		key   string
+		value any
+	}{
+		{"a", nil},
+		{"a", 123},
+		{"b", "test"},
+	}
+
+	for i, s := range scenarios {
+		j := types.JsonMap{}
+
+		j.Set(s.key, s.value)
+
+		if v := j[s.key]; v != s.value {
+			t.Errorf("(%d) Expected %s, got %v", i, s.value, v)
+		}
+	}
+}
+
 func TestJsonMapValue(t *testing.T) {
 	scenarios := []struct {
 		json     types.JsonMap