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# Passthrough Arguments

If you have a shortcut for running a specific combination of commands through concurrently,
you might need at some point to pass additional arguments/flags to some of these.

For example, imagine you have in your `package.json` file scripts like this:

```jsonc
{
  // ...
  "scripts": {
    "build:client": "tsc -p client",
    "build:server": "tsc -p server",
    "build": "concurrently npm:build:client npm:build:server",
  },
}
```

If you wanted to run only either `build:server` or `build:client` with an additional `--noEmit` flag,
you can do so with `npm run build:server -- --noEmit`, for example.<br/>
However, if you want to do that while using concurrently, as `npm run build -- --noEmit` for example,
you might find that concurrently actually parses `--noEmit` as its own flag, which does nothing,
because it doesn't exist.

To solve this, you can set the `--passthrough-arguments`/`-P` flag, which instructs concurrently to
take everything after a `--` as additional arguments that are passed through to the input commands
via a few placeholder styles:

## Single argument

We can modify the original `build` script to pass a single additional argument/flag to a script by using
a 1-indexed `{number}` placeholder to the command you want it to apply to:

```jsonc
{
  // ...
  "scripts": {
    // ...
    "build": "concurrently -P 'npm:build:client -- {1}' npm:build:server --",
    "typecheck": "npm run build -- --noEmit",
  },
}
```

With this, running `npm run typecheck` will pass `--noEmit` only to `npm run build:client`.

## All arguments

In the original `build` example script, you're more likely to want to pass every additional argument/flag
to your commands. This can be done with the `{@}` placeholder.

```jsonc
{
  // ...
  "scripts": {
    // ...
    "build": "concurrently -P 'npm:build:client -- {@}' 'npm:build:server -- {@}' --",
    "typecheck": "npm run build -- --watch --noEmit",
  },
}
```

In the above example, both `--watch` and `--noEmit` are passed to each command.

## All arguments, combined

If for some reason you wish to combine all additional arguments into a single one, you can do that with the `{*}` placeholder,
which wraps the arguments in quotes.

```jsonc
{
  // ...
  "scripts": {
    // ...
    "build": "concurrently -P 'npm:build:client -- --outDir {*}/client' 'npm:build:server -- --outDir {*}/server' -- $(date)",
  },
}
```

In the above example, the output of the `date` command, which looks like `Sun  1 Sep 2024 23:50:00 AEST` will be passed as a single string to the `--outDir` parameter of both commands.

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