• Add a bin property to our package.json file. This maps the command name to the name of the file to be executed (relative to package.json)

{
  "bin": {
    "til": "./index.js"
  }
}

So, when you install app, it'll create a symlink from the index.js script to /usr/local/bin/til.

Note:

Please make sure that your file(s) referenced in bin starts with #!/usr/bin/env node, otherwise the scripts are started without the node executable!

• Run yarn link or npm link to create a symlink to this package.

Refs:

• https://docs.npmjs.com/cli/v7/configuring-npm/package-json#bin
• https://docs.npmjs.com/cli/v7/commands/npm-link
• https://classic.yarnpkg.com/en/docs/cli/link/