docs: add spawn options

README.md

@@ -235,6 +235,32 @@ module.exports = {
 }
 ```
 
+### `options`
+
+Options which will be passed down to the [spawn](https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options) of the process. For example environment variables:
+
+```js
+// global-setup.js
+const { setup: setupDevServer, getServers } = require('jest-process-manager')
+
+module.exports = async function globalSetup() {
+  await setupDevServer({
+    command: `node config/start.js --port=3000`,
+    launchTimeout: 50000,
+    port: 3000,
+    options: {
+      env: {
+        "FOO": "bar",
+      }
+    }
+  })
+  getServers.then(servers => {
+    // You can get to the servers and do whatever you want
+  })
+  // Your global setup
+}
+```
+
 ## Troubleshooting
 
 - If using `port` makes the terminal to ask for root password although the port is valid and accessible then use `usePortAction: 'ignore'`.

src/index.ts

@@ -93,9 +93,12 @@ function runServer(config: JestProcessManagerOptions, index: number) {
 
   servers[index] = spawnd(config.command, {
     shell: true,
-    env: process.env,
     cwd: cwd(),
     ...config.options,
+    env: {
+      ...process.env,
+      ...(config.options?.env ? config.options.env : {})
+    }
   })
 
   if (config.debug) {
@@ -222,8 +225,8 @@ async function setupJestServer(providedConfig: JestProcessManagerOptions, index:
       await waitOn(opts)
     } catch (err) {
       throw new JestProcessManagerError(
-          `Server has taken more than ${launchTimeout}ms to start.`,
-          ERROR_TIMEOUT,
+        `Server has taken more than ${launchTimeout}ms to start.`,
+        ERROR_TIMEOUT,
       )
     }
   } else {