Check for 0 sized artifact lists

packages/artifact/__tests__/upload-artifact.test.ts

@@ -373,6 +373,17 @@ describe('upload-artifact', () => {
   })
 
   describe('skipArchive option', () => {
+    it('should throw an error if skipArchive is true and files array is empty', async () => {
+      const uploadResp = uploadArtifact(
+        fixtures.inputs.artifactName,
+        [],
+        fixtures.inputs.rootDirectory,
+        {skipArchive: true}
+      )
+
+      await expect(uploadResp).rejects.toThrow(FilesNotFoundError)
+    })
+
     it('should throw an error if skipArchive is true and multiple files are provided', async () => {
       const uploadResp = uploadArtifact(
         fixtures.inputs.artifactName,

packages/artifact/src/internal/upload/upload-artifact.ts

@@ -32,6 +32,10 @@ export async function uploadArtifact(
 ): Promise<UploadArtifactResponse> {
   let artifactFileName = `${name}.zip`
   if (options?.skipArchive) {
+    if (files.length === 0) {
+      throw new FilesNotFoundError([])
+    }
+
     if (files.length > 1) {
       throw new Error(
         'skipArchive option is only supported when uploading a single file'