71 lines
1.8 KiB
Markdown
71 lines
1.8 KiB
Markdown
# @react-native-community/cli-hermes
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This package is part of the [React Native CLI](../../README.md). It contains commands for managing the Hermes engine.
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## Installation
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```sh
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yarn add @react-native-community/cli-hermes
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```
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## Commands
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### `profile-hermes`
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Usage:
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```sh
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npx react-native profile-hermes [destinationDir] <flag>
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```
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Pull and convert a Hermes tracing profile to Chrome tracing profile, then store it in the directory <destinationDir> of the local machine.
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- `destinationDir` is optional, if provided, pull the file to that directory
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> default: pull to the current React Native app root directory
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#### Options
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#### `--filename <string>`
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File name of the profile to be downloaded, eg. sampling-profiler-trace8593107139682635366.cpuprofile.
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> default: pull the latest file
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#### `--raw`
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Pulls the original Hermes tracing profile without any transformation
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#### `--sourcemap-path <string>`
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The local path to your source map file if you generated it manually, ex. `/tmp/sourcemap.json`
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#### `--generate-sourcemap`
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Generate the JS bundle and source map in `os.tmpdir()`
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#### `--port <number>`
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The running metro server port number
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> default: 8081
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#### `--appId <string>`
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Specify an `applicationId` to launch after build. If not specified, `package` from AndroidManifest.xml will be used.
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#### `--appIdSuffix <string>`
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Specify an `applicationIdSuffix` to launch after build.
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#### `--host <string>`
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The host of the packager.
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> default: localhost
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### Notes on source map
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This step is recommended in order for the source map to be generated:
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If you are planning on building a debug APK, that will run without the packager, by invoking `./gradlew assembleDebug` you can simply set `bundleInDebug: true` in your app/build.gradle file, inside the `project.ext.react` map.
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