From d886d5f2954843c20a4710cf66aa3b020ea2f806 Mon Sep 17 00:00:00 2001
From: Alec Larson <1925840+aleclarson@users.noreply.github.com>
Date: Sat, 25 Jul 2020 19:57:01 -0400
Subject: [PATCH] feat: use `process.env.METRO_NODE_OPTIONS` when starting
 Metro

Instead of using NODE_OPTIONS from the expo-cli process, the Metro process overrides it with METRO_NODE_OPTIONS.

This has two effects: (1) the expo-cli process can be debugged with --inspect-brk without causing an "address already in use" error in the Metro process,
and (2) the Metro process can be debugged with --inspect-brk.
---
 packages/xdl/src/Project.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/xdl/src/Project.ts b/packages/xdl/src/Project.ts
index 051fabf1e7..2cb1fe2b33 100644
--- a/packages/xdl/src/Project.ts
+++ b/packages/xdl/src/Project.ts
@@ -1796,9 +1796,12 @@ export async function startReactNativeServerAsync(
 
   if (options.reset) {
     cliOpts.push('--reset-cache');
-  } // Get custom CLI path from project package.json, but fall back to node_module path
+  }
+
+  // Get custom CLI path from project package.json, but fall back to node_module path
   const defaultCliPath = resolveModule('react-native/local-cli/cli.js', projectRoot, exp);
   const cliPath = exp.rnCliPath || defaultCliPath;
+
   let nodePath;
   // When using a custom path for the RN CLI, we want it to use the project
   // root to look up config files and Node modules
@@ -1807,15 +1810,18 @@ export async function startReactNativeServerAsync(
   } else {
     nodePath = null;
   }
+
   // Run the copy of Node that's embedded in Electron by setting the
   // ELECTRON_RUN_AS_NODE environment variable
   // Note: the CLI script sets up graceful-fs and sets ulimit to 4096 in the
   // child process
   const nodePathEnv = nodePath ? { NODE_PATH: nodePath } : {};
+
   const packagerProcess = child_process.fork(cliPath, cliOpts, {
     cwd: projectRoot,
     env: {
       ...process.env,
+      NODE_OPTIONS: process.env.METRO_NODE_OPTIONS,
       REACT_NATIVE_APP_ROOT: projectRoot,
       ELECTRON_RUN_AS_NODE: '1',
       ...nodePathEnv,