fix(utils): unique names for parallel plugin execution (#1222)

Author: beaussan

packages/utils/src/lib/create-runner-files.ts

@@ -1,5 +1,6 @@
 import { writeFile } from 'node:fs/promises';
 import path from 'node:path';
+import { threadId } from 'node:worker_threads';
 import type { RunnerFilesPaths } from '@code-pushup/models';
 import { ensureDirectoryExists, pluginWorkDir } from './file-system.js';
 
@@ -13,8 +14,10 @@ export async function createRunnerFiles(
   pluginSlug: string,
   configJSON: string,
 ): Promise<RunnerFilesPaths> {
-  const timestamp = Date.now().toString();
-  const runnerWorkDir = path.join(pluginWorkDir(pluginSlug), timestamp);
+  // Use timestamp + process ID + threadId
+  // This prevents race conditions when running the same plugin for multiple projects in parallel
+  const uniqueId = `${(performance.timeOrigin + performance.now()) * 10}-${process.pid}-${threadId}`;
+  const runnerWorkDir = path.join(pluginWorkDir(pluginSlug), uniqueId);
   const runnerConfigPath = path.join(runnerWorkDir, 'plugin-config.json');
   const runnerOutputPath = path.join(runnerWorkDir, 'runner-output.json');