feat: Add support for including excepting SourceCharacter to printDescription

packages/apollo-federation/src/service/__tests__/buildFederatedSchema.test.ts

@@ -96,6 +96,20 @@ type Money {
           arg2: String
           "Description 3 Description 3 Description 3 Description 3 Description 3 Description 3 Description 3 Description 3 Description 3 Description 3 Description 3"
           arg3: String
+          """
+          Description block string including double quote "4"
+          """
+          arg4: String
+          "Description string value including double quote \\"5\\""
+          arg5: String
+          """
+          Description block string including back slash \\\\6\\\\
+          """
+          arg6: String
+          "Description string value including back slash \\\\7\\\\"
+          arg7: String
+          "Description string value including line terminator 8\\r\\n"
+          arg8: String
         ): String
       }
     `);
@@ -123,6 +137,25 @@ type User @key(fields: "id") {
     Description 3 Description 3 Description 3 Description 3 Description 3 Description 3
     """
     arg3: String
+    """
+    Description block string including double quote "4"
+    """
+    arg4: String
+    """
+    Description string value including double quote "5"
+    """
+    arg5: String
+    """
+    Description block string including back slash \\\\6\\\\
+    """
+    arg6: String
+    """
+    Description string value including back slash \\7\\
+    """
+    arg7: String
+    """
+    Description string value including line terminator 8\r\n    """
+    arg8: String
   ): String
 }
 `);

packages/apollo-federation/src/service/printFederatedSchema.ts

@@ -347,7 +347,10 @@ function printDescription(
   }
 
   const lines = descriptionLines(def.description, 120 - indentation.length);
-  if (lines.length === 1) {
+  const hasExceptingStringCharacter = /"|\\|\r|\n/.test(lines[0]);
+  const printAsSingleLine = lines.length === 1 && !hasExceptingStringCharacter;
+
+  if (printAsSingleLine) {
     return indentation + `"${lines[0]}"\n`;
   } else {
     return (
@@ -360,7 +363,7 @@ function descriptionLines(description: string, maxLen: number): Array<string> {
   const rawLines = description.split('\n');
   return rawLines.flatMap(line => {
     if (line.length < maxLen + 5) {
-      return line;
+      return line.length === 0 ? [] : line;
     }
     // For > 120 character long lines, cut at space boundaries into sublines
     // of ~80 chars.