From 68a30542b4758b0393d45e4242bcd77d4dc6cbad Mon Sep 17 00:00:00 2001
From: Eric Willhoit <ewillhoit@salesforce.com>
Date: Thu, 21 Sep 2023 15:38:13 -0500
Subject: [PATCH] feat: yarn network mutex

---
 src/yarn.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/yarn.ts b/src/yarn.ts
index 2dad9d1b..dae0eb57 100644
--- a/src/yarn.ts
+++ b/src/yarn.ts
@@ -46,11 +46,17 @@ export default class Yarn {
   async exec(args: string[] = [], opts: {cwd: string; verbose: boolean}): Promise<void> {
     const cwd = opts.cwd
     if (args[0] !== 'run') {
+      // https://classic.yarnpkg.com/lang/en/docs/cli/#toc-concurrency-and-mutex
+      // Default port is: 31997
+      const port = this.config.scopedEnvVar('NETWORK_MUTEX_PORT')
+      const optionalPort = port ? `:${port}` : ''
+      const mutex = this.config.scopedEnvVar('USE_NETWORK_MUTEX') ? `network${optionalPort}` : `file:${path.join(cwd, 'yarn.lock')}`
+      console.log('mutex', mutex);
       const cacheDir = path.join(this.config.cacheDir, 'yarn')
       args = [
         ...args,
         '--non-interactive',
-        `--mutex=file:${path.join(cwd, 'yarn.lock')}`,
+        `--mutex=${mutex}`,
         `--preferred-cache-folder=${cacheDir}`,
         '--check-files',
       ]