Throw error if somebody tries to use styleMapping()

2 files changed, 15 insertions, 0 deletions

diff --git a/lib/index.js b/lib/index.js
index baae852..35bcbaf 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -25,3 +25,7 @@ function convertDocumentToHtml(documentResult, options) {
         return documentConverter.convertToHtml(document);
     });
 }
+
+exports.styleMapping = function() {
+    throw new Error('Use a raw string instead of mammoth.styleMapping e.g. "p[style-naming=\'Title\'] => h1" instead of mammoth.styleMapping("p[style-naming=\'Title\'] => h1")');
+};
diff --git a/tests/mammoth.tests.js b/tests/mammoth.tests.js
index 0c9519e..90b96e5 100644
--- a/tests/mammoth.tests.js
+++ b/tests/mammoth.tests.js
@@ -95,4 +95,15 @@ describe('mammoth', function() {
             assert.deepEqual(result.messages, []);
         });
     });
+    
+    test('using styleMapping throws error', function() {
+        try {
+            mammoth.styleMapping()
+        } catch (error) {
+            assert.equal(
+                error.message,
+                'Use a raw string instead of mammoth.styleMapping e.g. "p[style-naming=\'Title\'] => h1" instead of mammoth.styleMapping("p[style-naming=\'Title\'] => h1")'
+            );
+        }
+    });
 })