react-native-nowatch

Run react-native CLI without it starting a gazillion file watchers.

A hack to work around facebook/metro bug #355 - Watch option is ignored when creating JestHasteMap.

Installation

yarn add react-native-nowatch

Use

Instead of calling react-native directly, call:

./node_modules/.bin/react-native-nowatch

Or from npm scripts, simply:

react-native-nowatch

Why?

Ever had to run something like this?

echo fs.inotify.max_user_instances=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
echo fs.inotify.max_user_watches=524288   | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
echo fs.inotify.max_queued_events=524288  | sudo tee -a /etc/sysctl.conf && sudo sysctl -p

Ever seen an error like this?

BUILD FAILED in 3m 0s

error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with --verbose flag for more details.
Error: Command failed: ./gradlew app:bundleReleaseJsAndAssets -PreactNativeDevServerPort=8081
Picked up _JAVA_OPTIONS: -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap
internal/fs/watchers.js:173
    throw error;
    ^

Error: ENOSPC: System limit for number of file watchers reached, watch '/builds/example/kickass-app/node_modules/whatevrer'
    at FSWatcher.start (internal/fs/watchers.js:165:26)
    at Object.watch (fs.js:1258:11)
    at NodeWatcher.watchdir (/builds/example/kickass-app/node_modules/sane/src/node_watcher.js:159:22)
    at Walker.<anonymous> (/builds/example/kickass-app/node_modules/sane/src/common.js:109:31)
    at Walker.emit (events.js:198:13)
    at /builds/example/kickass-app/node_modules/walker/lib/walker.js:69:16
    at FSReqWrap.args [as oncomplete] (fs.js:140:20)

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:bundleReleaseJsAndAssets'.
> Process 'command 'node'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 3m 0s

    at checkExecSyncError (child_process.js:629:11)
    at execFileSync (child_process.js:647:13)
    at runOnAllDevices (/builds/example/kickass-app/node_modules/@react-native-community/cli-platform-android/build/commands/runAndroid/runOnAllDevices.js:94:39)
    at process._tickCallback (internal/process/next_tick.js:68:7)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
ERROR: Job failed: exit code 1