All files / lib isPackageInstalled.ts

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import chalk from 'chalk'
import { PACKAGES_INSTALLED } from '../internal'
 
/**
 * Checks if a package is installed.
 * Throws an error if it doesn't (forces the cli to exit).
 * Notifies the user, so that they can install missing deps!
 */
export const isPackageInstalled = (packageName: string) => {
  if (!PACKAGES_INSTALLED.includes(packageName)) {
    throw Error(
      chalk.red(
        `Whoops, please make sure you install ${packageName}:\nnpm i --save-dev ${packageName}`
      )
    )
  }
 
  return true
}