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# `@lerna/run`

> Run an npm script in each package that contains that script

Install [lerna](https://www.npmjs.com/package/lerna) for access to the `lerna` CLI.

## Usage

```sh
$ lerna run <script> -- [..args] # runs npm run my-script in all packages that have it
$ lerna run test
$ lerna run build

# watch all packages and transpile on change, streaming prefixed output
$ lerna run --parallel watch
```

Run an [npm script](https://docs.npmjs.com/misc/scripts) in each package that contains that script. A double-dash (`--`)
is necessary to pass dashed arguments to the script execution.

## Options

`lerna run` accepts all [filter flags](https://www.npmjs.com/package/@lerna/filter-options).

```sh
$ lerna run --scope my-component test
```

### `--npm-client <client>`

Must be an executable that knows how to run npm lifecycle scripts.
The default `--npm-client` is `npm`.

```sh
$ lerna run build --npm-client=yarn
```

May also be configured in `lerna.json`:

```json
{
  "command": {
    "run": {
      "npmClient": "yarn"
    }
  }
}
```

### `--stream`

Stream output from child processes immediately, prefixed with the originating
package name. This allows output from different packages to be interleaved.

```sh
$ lerna run watch --stream
```

### `--parallel`

Similar to `--stream`, but completely disregards concurrency and topological sorting, running a given command or script
immediately in all matching packages with prefixed streaming output. This is the preferred flag for long-running
processes such as `npm run watch` run over many packages.

```sh
$ lerna run watch --parallel
```

> **Note:** It is advised to constrain the scope of this command when using
> the `--parallel` flag, as spawning dozens of subprocesses may be
> harmful to your shell's equanimity (or maximum file descriptor limit,
> for example). YMMV

### `--no-bail`

```sh
# Run an npm script in all packages that contain it, ignoring non-zero (error) exit codes
$ lerna run --no-bail test
```

By default, `lerna run` will exit with an error if _any_ script run returns a non-zero exit code.
Pass `--no-bail` to disable this behavior, running the script in _all_ packages that contain it regardless of exit code.

### `--no-prefix`

Disable package name prefixing when output is streaming (`--stream` _or_ `--parallel`).
This option can be useful when piping results to other processes, such as editor plugins.

### `--profile`

Profiles the script executions and produces a performance profile which can be analyzed using DevTools in a
Chromium-based browser (direct url: `devtools://devtools/bundled/devtools_app.html`). The profile shows a timeline of
the script executions where each execution is assigned to an open slot. The number of slots is determined by the
`--concurrency` option and the number of open slots is determined by `--concurrency` minus the number of ongoing
operations. The end result is a visualization of the parallel execution of your scripts.

The default location of the performance profile output is at the root of your project.

```sh
$ lerna run build --profile
```

> **Note:** Lerna will only profile when topological sorting is enabled (i.e. without `--parallel` and `--no-sort`).

### `--profile-location <location>`

You can provide a custom location for the performance profile output. The path provided will be resolved relative to the
current working directory.

```sh
$ lerna run build --profile --profile-location=logs/profile/
```

### `useNx` (experimental)

Enables integration with [Nx](https://nx.dev). Setting `"useNx": true` in `lerna.json` will tell Lerna to delegate
running tasks to Nx instead of using `p-map` and `p-queue`. This only works if Nx is installed and `nx.json` is present.

Example of `nx.json`:

```json
{
  "extends": "nx/presets/npm.json",
  "tasksRunnerOptions": {
    "default": {
      "runner": "nx/tasks-runners/default",
      "options": {
        "cacheableOperations": ["build"]
      }
    }
  }
}
```

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