chore(ci): skip spreading if generated/main does not exist (#273)

* chore(ci): skip spreading if generated/main does not exist

* chore: update implementation of gitBranchExists

scripts/ci/codegen/cleanGeneratedBranch.ts

@@ -1,5 +1,5 @@
 /* eslint-disable no-console */
-import { run } from '../../common';
+import { gitBranchExists, run } from '../../common';
 
 /**
  * Deletes a branch for its `generated/${headRef}` name on origin.
@@ -13,7 +13,7 @@ export async function cleanGeneratedBranch(headRef: string): Promise<void> {
 
   const generatedCodeBranch = `generated/${headRef}`;
 
-  if (!(await run(`git ls-remote --heads origin ${generatedCodeBranch}`))) {
+  if (!(await gitBranchExists(generatedCodeBranch))) {
     console.log(`No branch named '${generatedCodeBranch}' was found.`);
 
     return;

scripts/ci/codegen/spreadGeneration.ts

@@ -1,4 +1,11 @@
-import { gitCommit, LANGUAGES, run, toAbsolutePath } from '../../common';
+/* eslint-disable no-console */
+import {
+  gitBranchExists,
+  gitCommit,
+  LANGUAGES,
+  run,
+  toAbsolutePath,
+} from '../../common';
 import { getLanguageFolder } from '../../config';
 import {
   cloneRepository,
@@ -41,6 +48,13 @@ async function spreadGeneration(): Promise<void> {
     throw new Error('Environment variable `GITHUB_TOKEN` does not exist.');
   }
 
+  if (!(await gitBranchExists(GENERATED_MAIN_BRANCH))) {
+    console.log(
+      `Skiping because the branch \`${GENERATED_MAIN_BRANCH}\` does not exist.`
+    );
+    return;
+  }
+
   const lastCommitMessage = await run(`git log -1 --format="%s"`);
   const name = (await run(`git log -1 --format="%an"`)).trim();
   const email = (await run(`git log -1 --format="%ae"`)).trim();

scripts/common.ts

@@ -189,3 +189,7 @@ export async function buildCustomGenerators(verbose: boolean): Promise<void> {
   });
   spinner.succeed();
 }
+
+export async function gitBranchExists(branchName: string): Promise<boolean> {
+  return Boolean(await run(`git ls-remote --heads origin ${branchName}`));
+}