From 0b551ec8207d4ac9913e5999521d35f94c21cf05 Mon Sep 17 00:00:00 2001
From: Ivan Goncharov <ivan.goncharov.ua@gmail.com>
Date: Mon, 16 Sep 2019 16:33:29 +0300
Subject: [PATCH] printSchema: support empty descriptions

---
 src/utilities/__tests__/schemaPrinter-test.js | 14 ++++++++++++++
 src/utilities/buildASTSchema.js               |  2 +-
 src/utilities/schemaPrinter.js                |  2 +-
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/utilities/__tests__/schemaPrinter-test.js b/src/utilities/__tests__/schemaPrinter-test.js
index 850e47f94f..5f82f097db 100644
--- a/src/utilities/__tests__/schemaPrinter-test.js
+++ b/src/utilities/__tests__/schemaPrinter-test.js
@@ -483,6 +483,20 @@ describe('Type System Printer', () => {
     `);
   });
 
+  it('Prints an empty description', () => {
+    const output = printSingleFieldSchema({
+      type: GraphQLString,
+      description: '',
+    });
+
+    expect(output).to.equal(dedent`
+      type Query {
+        """"""
+        singleField: String
+      }
+    `);
+  });
+
   it('One-line prints a short description', () => {
     const description = 'This field is awesome';
     const output = printSingleFieldSchema({
diff --git a/src/utilities/buildASTSchema.js b/src/utilities/buildASTSchema.js
index 3f0ed0d7ff..6b7951144e 100644
--- a/src/utilities/buildASTSchema.js
+++ b/src/utilities/buildASTSchema.js
@@ -475,7 +475,7 @@ function getLeadingCommentBlock(node): void | string {
     comments.push(value);
     token = token.prev;
   }
-  return comments.reverse().join('\n');
+  return comments.length > 0 ? comments.reverse().join('\n') : undefined;
 }
 
 /**
diff --git a/src/utilities/schemaPrinter.js b/src/utilities/schemaPrinter.js
index 6d50a62e5e..8b9e863ef7 100644
--- a/src/utilities/schemaPrinter.js
+++ b/src/utilities/schemaPrinter.js
@@ -317,7 +317,7 @@ function printDescription(
   indentation = '',
   firstInBlock = true,
 ): string {
-  if (!def.description) {
+  if (def.description == null) {
     return '';
   }