From d7ebacd17934d75228aedb0ac4fbdb6624eb3feb Mon Sep 17 00:00:00 2001
From: Martin Jesper Low Madsen <martin@martinjlowm.dk>
Date: Sun, 5 Jul 2020 22:21:34 +0200
Subject: [PATCH] fix(plugin-version): Correctly check void releases for all
 falsy values (#1536)

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('')
undefined
> require('js-yaml').safeLoad('releases:\n')
{ releases: null }
```
---
 .yarn/versions/7bfd08a0.yml                     | 2 ++
 packages/plugin-version/sources/versionUtils.ts | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)
 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..b2d377d28816 100644
--- a/packages/plugin-version/sources/versionUtils.ts
+++ b/packages/plugin-version/sources/versionUtils.ts
@@ -174,10 +174,11 @@ export async function updateVersionFiles(project: Project) {
     const versionContent = await xfs.readFilePromise(versionPath, `utf8`);
     const versionData = parseSyml(versionContent);
 
-    if (typeof versionData.releases === `undefined`)
+    const releases = versionData?.releases;
+    if (!releases)
       continue;
 
-    for (const locatorStr of Object.keys(versionData.releases || {})) {
+    for (const locatorStr of Object.keys(releases)) {
       const locator = structUtils.parseLocator(locatorStr);
       const workspace = project.tryWorkspaceByLocator(locator);