Allow running a build from a repo with only one commit when not in CI

node-src/git/getCommitAndBranch.test.ts

@@ -87,11 +87,19 @@ describe('getCommitAndBranch', () => {
     expect(info).toMatchObject({ branch: 'master' });
   });
 
-  it('throws when there is only one commit', async () => {
+  it('throws when there is only one commit, CI', async () => {
+    envCi.mockReturnValue({ isCi: true });
     hasPreviousCommit.mockResolvedValue(false);
     await expect(getCommitAndBranch({ log })).rejects.toThrow('Found only one commit');
   });
 
+  it('does NOT throw when there is only one commit, non-CI', async () => {
+    envCi.mockReturnValue({ isCi: false });
+    hasPreviousCommit.mockResolvedValue(false);
+    const info = await getCommitAndBranch({ log });
+    expect(info).toMatchObject({});
+  });
+
   describe('with branchName', () => {
     it('uses provided branchName as branch', async () => {
       const info = await getCommitAndBranch({ log }, { branchName: 'foobar' });

node-src/git/getCommitAndBranch.ts

@@ -50,14 +50,20 @@ export default async function getCommitAndBranch(
     CHROMATIC_PULL_REQUEST_SHA,
     CHROMATIC_SLUG,
   } = process.env;
+  const { isCi, service, prBranch, branch: ciBranch, commit: ciCommit, slug: ciSlug } = envCi();
 
   const isFromEnvVariable = CHROMATIC_SHA && CHROMATIC_BRANCH; // Our GitHub Action also sets these
   const isTravisPrBuild = TRAVIS_EVENT_TYPE === 'pull_request';
   const isGitHubAction = GITHUB_ACTIONS === 'true';
   const isGitHubPrBuild = GITHUB_EVENT_NAME === 'pull_request';
 
   if (!(await hasPreviousCommit())) {
-    throw new Error(gitOneCommit(isGitHubAction));
+    const message = gitOneCommit(isGitHubAction);
+    if (isCi) {
+      throw new Error(message);
+    } else {
+      log.warn(message);
+    }
   }
 
   if (isFromEnvVariable) {
@@ -117,7 +123,6 @@ export default async function getCommitAndBranch(
     slug = GITHUB_REPOSITORY;
   }
 
-  const { isCi, service, prBranch, branch: ciBranch, commit: ciCommit, slug: ciSlug } = envCi();
   const ciService = process.env.CHROMATIC_ACTION ? 'chromaui/action' : service;
   slug = slug || ciSlug;
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chromatic",
-  "version": "7.0.0",
+  "version": "7.1.0-canary.4",
   "description": "Automate visual testing across browsers. Gather UI feedback. Versioned documentation.",
   "keywords": [
     "storybook-addon",