Preserve messages in Converter

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/docx-reader.js b/lib/docx-reader.js
index b1e5627..e01d253 100644
--- a/lib/docx-reader.js
+++ b/lib/docx-reader.js
@@ -146,6 +146,12 @@ Result.prototype.map = function(func) {
     return new Result(func(this.value), this.messages);
 };
 
+Result.prototype.mapThen = function(func) {
+    return func(this.value).then(function(resultValue) {
+        return new Result(resultValue, this.messages);
+    });
+};
+
 function warning(message) {
     return {
         type: "warning",