Fix YAML.stringify() for certain null values (#197)

eemeli · Sep 23, 2020 · ee431e2 · ee431e2
1 parent 9c8d758
commit ee431e2
Show file tree

Hide file tree

Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/src/doc/createNode.js b/src/doc/createNode.js
@@ -22,7 +22,7 @@ export function createNode(value, tagName, ctx) {
   let tagObj = findTagObject(value, tagName, tags)
   if (!tagObj) {
     if (typeof value.toJSON === 'function') value = value.toJSON()
-    if (typeof value !== 'object')
+    if (!value || typeof value !== 'object')
       return wrapScalars ? new Scalar(value) : value
     tagObj = value instanceof Map ? map : value[Symbol.iterator] ? seq : map
   }

diff --git a/tests/doc/stringify.js b/tests/doc/stringify.js
@@ -988,3 +988,10 @@ describe('YAML.stringify options as scalar', () => {
     )
   })
 })
+
+describe('YAML.stringify on ast Document', () => {
+  test('null document', () => {
+    const doc = YAML.parseDocument('null')
+    expect(YAML.stringify(doc)).toBe('null\n')
+  })
+})