Fixed an issue with adding [undefined] to the generated changelog (#…

…660)

* Fix generated undefined in changelog

* fix: update test snapshot

* Create tame-guests-fold.md

* Include the fix in the `@changesets/changelog-git` too

Co-authored-by: Mateusz Burzyński <mateuszburzynski@gmail.com>

.changeset/tame-guests-fold.md

@@ -0,0 +1,5 @@
+---
+"@changesets/cli": patch
+---
+
+Fixed an issue with adding `[undefined]` to the generated changelog when the commit adding a changeset file could not be found. This could have happened when running `changeset add && changeset version` in a single command and when using the default changelog generator.

packages/apply-release-plan/src/index.test.ts

@@ -1612,7 +1612,7 @@ describe("apply release plan", () => {
       ### Patch Changes
 
       - Hey, let's have fun with testing!
-      - Updated dependencies [undefined]
+      - Updated dependencies
         - pkg-b@1.2.1`);
 
       expect(readmeB.trim()).toEqual(outdent`# pkg-b
@@ -1621,7 +1621,7 @@ describe("apply release plan", () => {
       ### Patch Changes
 
       - Hey, let's have fun with testing!
-      - Updated dependencies [undefined]
+      - Updated dependencies
         - pkg-a@1.0.4`);
     });
 
@@ -1791,7 +1791,7 @@ describe("apply release plan", () => {
       ### Patch Changes
 
       - Hey, let's have fun with testing!
-      - Updated dependencies [undefined]
+      - Updated dependencies
         - pkg-c@2.1.0`);
 
       expect(readmeC.trim()).toEqual(outdent`# pkg-c
@@ -1890,7 +1890,7 @@ describe("apply release plan", () => {
       ### Patch Changes
 
       - Hey, let's have fun with testing!
-      - Updated dependencies [undefined]
+      - Updated dependencies
         - pkg-c@2.0.1`);
 
       expect(readmeC.trim()).toEqual(outdent`# pkg-c

packages/changelog-git/src/index.ts

@@ -31,7 +31,10 @@ const getDependencyReleaseLine = async (
   if (dependenciesUpdated.length === 0) return "";
 
   const changesetLinks = changesets.map(
-    changeset => `- Updated dependencies [${changeset.commit}]`
+    changeset =>
+      `- Updated dependencies${
+        changeset.commit ? ` [${changeset.commit}]` : ""
+      }`
   );
 
   const updatedDepenenciesList = dependenciesUpdated.map(

packages/cli/src/changelog/index.ts

@@ -7,8 +7,7 @@ import {
 
 const getReleaseLine = async (
   changeset: NewChangesetWithCommit,
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  type: VersionType
+  _type: VersionType
 ) => {
   const [firstLine, ...futureLines] = changeset.summary
     .split("\n")
@@ -32,7 +31,10 @@ const getDependencyReleaseLine = async (
   if (dependenciesUpdated.length === 0) return "";
 
   const changesetLinks = changesets.map(
-    changeset => `- Updated dependencies [${changeset.commit}]`
+    changeset =>
+      `- Updated dependencies${
+        changeset.commit ? ` [${changeset.commit}]` : ""
+      }`
   );
 
   const updatedDepenenciesList = dependenciesUpdated.map(