What does the "start" script do in the package.json file for Angular 2 when running "concurrent \"npm run tsc:w\" \"npm run lite\"" command?

What is the purpose of concurrent in this code snippet?

  "scripts": {
      "tsc": "tsc",
      "tsc:w": "tsc -w",
      "lite": "lite-server",
      "start": "Concurrent npm run tsc:w npm run lite"
    }

Answer №1

As stated in the official documentation.

The section labeled "scripts" serves as a collection of script commands that are executed at different points throughout your package's lifecycle. Each key corresponds to a specific event, while the associated value is the command to be executed at that particular moment.

Therefore, when you use the start command, it will concurrently run both npm run tsc:w and npm run lite. For more information on scripts and how to utilize the run command, refer to the provided links.

Executing npm run tsc:w compiles your TypeScript code while also monitoring for any changes. Running npm run lite initiates the npm server for your current application.

Answer №2

The "script" attribute is utilized to specify the command that can be executed on the terminal. Executing npm run start in the command line will trigger the following concurrently:

  1. The typescript compiler will operate in watch mode (npm run tsc:w)
  2. Your lite-server will be launched (npm run lite)

You must have the node package called concurrently defined as follows :

"devDependencies": {
        "concurrently": "^2.0.0"
}

Add it as dependencies/devDependencies in your package.json file so you can use concurrent as a keyword.

Concurrently enables you to

Execute multiple commands simultaneously

As articulated on this page.

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