exists command

Checks if file or directory with name given as first argument exist and returns proper exit code. It can be used to run some tasks in package.json conditionally. For example we can make a build before running tests if build directory does not exist, like in the example presented below.

Installation

npm install exists-command --save-dev

Example usage:

package.json:

{
  "scripts": {
    "pretest": "if !(exists build); then npm run build; fi",
  },
}