From b596237f3ecf5d9d1ed34b3eda813b4a8ba7bfe8 Mon Sep 17 00:00:00 2001
From: Martin Jesper Low Madsen <martin@martinjlowm.dk>
Date: Wed, 1 Jul 2020 20:39:43 +0200
Subject: [PATCH] fix(plugin-version): Correctly check void releases for a null
 value

js-yaml implements the YAML spec and it has no undefined type:

- https://github.com/nodeca/js-yaml/issues/356#issuecomment-311614322

I.e.:

```
> require('js-yaml').safeLoad('releases:\n')
{ releases: null }
```
---
 .yarn/versions/7bfd08a0.yml                     | 2 ++
 packages/plugin-version/sources/versionUtils.ts | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 .yarn/versions/7bfd08a0.yml

diff --git a/.yarn/versions/7bfd08a0.yml b/.yarn/versions/7bfd08a0.yml
new file mode 100644
index 000000000000..a10256495695
--- /dev/null
+++ b/.yarn/versions/7bfd08a0.yml
@@ -0,0 +1,2 @@
+releases:
+  "@yarnpkg/plugin-version": prerelease
diff --git a/packages/plugin-version/sources/versionUtils.ts b/packages/plugin-version/sources/versionUtils.ts
index 9901ac781c93..1ef6607d78bc 100644
--- a/packages/plugin-version/sources/versionUtils.ts
+++ b/packages/plugin-version/sources/versionUtils.ts
@@ -174,7 +174,7 @@ export async function updateVersionFiles(project: Project) {
     const versionContent = await xfs.readFilePromise(versionPath, `utf8`);
     const versionData = parseSyml(versionContent);
 
-    if (typeof versionData.releases === `undefined`)
+    if (versionData.releases === null)
       continue;
 
     for (const locatorStr of Object.keys(versionData.releases || {})) {