From ab0d4c977fff2f3c5f8991f0923bcd77be69fd51 Mon Sep 17 00:00:00 2001
From: Noah Santschi-Cooney <noah@santschi-cooney.ch>
Date: Thu, 31 May 2018 23:09:39 +0100
Subject: [PATCH] Added an async process spawner using promises

---
 src/asyncSpawn.ts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 src/asyncSpawn.ts

diff --git a/src/asyncSpawn.ts b/src/asyncSpawn.ts
new file mode 100644
index 0000000..e683f54
--- /dev/null
+++ b/src/asyncSpawn.ts
@@ -0,0 +1,26 @@
+import { spawn } from 'child_process'
+
+export function runLinter(...args: any[]) {
+  const child = spawn(args[0], ...(args.slice(1)))
+  let stderr = ''
+
+  child.stderr.on('data', data => {
+    stderr += data
+  })
+
+  const promise = new Promise<string>((resolve, reject) => {
+    child.on('error', () => reject(new Error('fatal error ${stderr}')))
+
+    child.on('exit', (code, signal) => {
+      switch (code) {
+        case 0:
+        case 2:
+          resolve(stderr)
+        default:
+          reject(new Error('standard error ${signal} ${stderr}'))
+      }
+    })
+  })
+
+  return promise
+}
\ No newline at end of file