From 9a976701476269b72fcb8a0ab7e21f464ff68647 Mon Sep 17 00:00:00 2001
From: Eemeli Aro <eemeli@gmail.com>
Date: Tue, 25 Dec 2018 15:58:38 +0200
Subject: [PATCH] createNode: Call toJSON() if defined (#63)

---
 __tests__/createNode.js | 8 ++++++++
 src/createNode.js       | 1 +
 2 files changed, 9 insertions(+)

diff --git a/__tests__/createNode.js b/__tests__/createNode.js
index 9c82b46b..99c24c9a 100644
--- a/__tests__/createNode.js
+++ b/__tests__/createNode.js
@@ -283,3 +283,11 @@ y:
     })
   })
 })
+
+describe('toJSON()', () => {
+  test('Date', () => {
+    const date = new Date('2018-12-22T08:02:52Z')
+    const node = createNode(date)
+    expect(node.value).toBe(date.toJSON())
+  })
+})
diff --git a/src/createNode.js b/src/createNode.js
index 90e88e85..8772526c 100644
--- a/src/createNode.js
+++ b/src/createNode.js
@@ -17,6 +17,7 @@ function createMapNode(iterable, wrapScalars) {
 
 export default function createNode(value, wrapScalars = true) {
   if (value == null) return new Scalar(null)
+  if (typeof value.toJSON === 'function') value = value.toJSON()
   if (typeof value !== 'object') return wrapScalars ? new Scalar(value) : value
   if (Array.isArray(value)) {
     const seq = new Seq()