text: const path = require('path')
  const isWindows = require('./is-windows')
  
  module.exports = commandConvert
  
  /**
   * Converts an environment variable usage to be appropriate for the current OS
   * @param {String} command Command to convert
   * @param {Object} env Map of the current environment variable names and their values
   * @param {boolean} normalize If the command should be normalized using `path`
   * after converting
   * @returns {String} Converted command
   */
  function commandConvert(command, env, normalize = false) {
    if (!isWindows()) {
      return command.replace(/\${(\w+):([^}]+)}/g, (match, $1, $2) => {
        return env[$1] ? '${'+$1+'}' : $2;
      });
    }
    const envUnixRegex = /\$(\w+)|\${(\w+)(:[^}]+)?}/g // $my_var or ${my_var}
    const convertedCmd = command.replace(envUnixRegex, (match, $1, $2, $3) => {
      const varName = $1 || $2
      // In Windows, non-existent variables are not replaced by the shell,
      // so for example "echo %FOO%" will literally print the string "%FOO%", as
      // opposed to printing an empty string in UNIX. See kentcdodds/cross-env#145
      // If the env variable isn't defined at runtime, just strip it from the command entirely
      return env[varName] ? `%${varName}%` : (($3 && $3.substring(1)) || '')
    })
    // Normalization is required for commands with relative paths
    // For example, `./cmd.bat`. See kentcdodds/cross-env#127
    // However, it should not be done for command arguments.
    // See https://github.com/kentcdodds/cross-env/pull/130#issuecomment-319887970
    return normalize === true ? path.normalize(convertedCmd) : convertedCmd
  }
  