From f3d6af6ac16c15c58edc4b684848b468966aca58 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=F0=9F=91=A8=F0=9F=8F=BC=E2=80=8D=F0=9F=92=BB=20Romain=20M?=
 =?UTF-8?q?arcadier-Muller?= <rmuller@amazon.com>
Date: Thu, 20 Jun 2019 16:05:18 +0200
Subject: [PATCH] fix(cli): Disable line folding in YAML

Certain versions of YAML support long line folding, however the
CloudFormation YAML parser does not handle those. Disabling folding
when generating YAML so that we keep generating correct templates.

Fixes #2703
---
 packages/aws-cdk/lib/serialize.ts       | 11 ++++++++++-
 packages/aws-cdk/test/test.serialize.ts | 12 ++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 packages/aws-cdk/test/test.serialize.ts

diff --git a/packages/aws-cdk/lib/serialize.ts b/packages/aws-cdk/lib/serialize.ts
index 3219cb5a48836..70f0550ddfbba 100644
--- a/packages/aws-cdk/lib/serialize.ts
+++ b/packages/aws-cdk/lib/serialize.ts
@@ -1,10 +1,19 @@
 import YAML = require('yaml');
 
+// tslint:disable-next-line: no-var-requires
+const yamlTypes = require('yaml/types');
+
 /**
  * Stringify to YAML
  */
 export function toYAML(obj: any): string {
+  const oldFold = yamlTypes.strOptions.fold.lineWidth;
+  try {
+    yamlTypes.strOptions.fold.lineWidth = 0;
     return YAML.stringify(obj, { schema: 'yaml-1.1' });
+  } finally {
+    yamlTypes.strOptions.fold.lineWidth = oldFold;
+  }
 }
 
 /**
@@ -35,4 +44,4 @@ export function serializeStructure(object: any, json: boolean) {
   } else {
     return toYAML(object);
   }
-}
\ No newline at end of file
+}
diff --git a/packages/aws-cdk/test/test.serialize.ts b/packages/aws-cdk/test/test.serialize.ts
new file mode 100644
index 0000000000000..54b1d1db6c3cc
--- /dev/null
+++ b/packages/aws-cdk/test/test.serialize.ts
@@ -0,0 +1,12 @@
+import nodeunit = require('nodeunit');
+import { toYAML } from '../lib/serialize';
+
+export = nodeunit.testCase({
+  toYAML: {
+    'does not wrap lines'(test: nodeunit.Test) {
+      const longString = 'Long string is long!'.repeat(1_024);
+      test.equal(toYAML({ longString }), `longString: ${longString}\n`);
+      test.done();
+    }
+  }
+});