DEV Community

Ian Ochieng
Ian Ochieng

Posted on

Debugging Expo: Fixing Node v18 Incompatibilities and Network ETIMEDOUT Errors on Linux

#reactnative #expo #typescript #debugging

Setting up a fresh mobile workspace can sometimes feel like running an obstacle course. If you’ve ever run npx create-expo-app only to be met with a wall of engine warnings, random ReferenceError: File is not defined breaks, and persistent ETIMEDOUT network failures, you are not alone.

Here is exactly why these errors happen on a Linux environment and a bulletproof roadmap to fixing them.

The Culprit 1: Node.js Version Mismatch

Modern scaffolding tools move fast. The latest editions of create-expo-app heavily leverage modern Web APIs natively inside the runtime environment (specifically the global File interface).

If you are running an older LTS release like Node v18.19.1, you will trigger an internal crash:

npm WARN EBADENGINE package: 'create-expo-app@5.0.0', required: { node: '>=20.0.0' }
ReferenceError: File is not defined
Enter fullscreen mode Exit fullscreen mode

The Solution: Node Version Manager (NVM)

Don't rely on system package managers like apt which often trail behind. Pull down the repository manually, configure your profile, and upgrade to the recommended target (Node 22):

# Clone the repository
git clone https://github.com ~/.nvm
cd ~/.nvm && git checkout v0.40.1 && cd ~

# Register NVM to your shell profile
echo 'export NVM_DIR="$HOME/.nvm"' >> ~/.bashrc
echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"' >> ~/.bashrc
source ~/.bashrc

# Switch to the stable runtime
nvm install 22
nvm use 22
Enter fullscreen mode Exit fullscreen mode

The Culprit 2: The ETIMEDOUT Registry Wall

If you are working on a company asset or behind restrictive network routing layers, standard interactive initializations can drop packets. Expo CLI's pre-download validation steps check versions remotely; if your gateway delays this handshake, you will get hit with an AggregateError [ETIMEDOUT].

The Solution: Bypass CLI Network Checks

When npx expo install times out checking SDK compatibility tables, you can skip the middleman. Explicitly declare your target packages and pass a massive timeout flag (npm_config_timeout=600000) directly to standard npm:

npm_config_timeout=600000 npm install @react-native-async-storage/async-storage@1.24.0 @react-native-community/netinfo@11.4.1
Enter fullscreen mode Exit fullscreen mode

This circumvents the CLI wrapper check and pulls the packages down directly via the direct registry stream.

The Culprit 3: Jest Transpilation Failures (Unexpected token)

Once your dependencies are in, writing tests with modern features like TypeScript type assertions (as const) can make Jest choke out of the box:

SyntaxError: Unexpected token, expected ","
  > 16 |       category: 'flooding' as const,
       |                            ^
Enter fullscreen mode Exit fullscreen mode

This happens because Jest runs inside basic Node and needs an explicit instruction set to clean up TypeScript syntax before executing assertions.

The Solution: Add the Expo Babel Engine

You need to explicitly feed the babel-preset-expo compilation module to your project development dependencies and configure Jest to use it:

# Install the missing preset engine
npm install --save-dev babel-preset-expo

# Create your babel.config.js
echo "module.exports = function(api) {
  api.cache(true);
  return {
    presets: ['babel-preset-expo'],
  };
};" > babel.config.js
Enter fullscreen mode Exit fullscreen mode

Finally, assign the global preset config layer inside your package.json:

"jest": {
  "preset": "jest-expo"
}
Enter fullscreen mode Exit fullscreen mode

Now, typing npm test will yield clean green checkmarks across your test suites!

Wrapped Up and Ready

Debugging infrastructure issues can be draining, but understanding the underlying breaks—Node runtime constraints, network wrappers, and transpiler rules—turns a frustrating block into a minor bump.

Have you hit similar walls with Expo or WSL networking? Drop your workarounds below!

Top comments (0)