Function exec

lib/config/exec.js:77–240

* Discovers all the options required to run the script * and if a custom exec has been passed in, then it will * also try to work out what extensions to monitor and * whether there's a special way of running that script. * * @param {Object} nodemonOptions * @param {Object} execMap * @return

(nodemonOptions, execMap)

 * @return {Object} new and updated version of nodemonOptions
 */
function exec(nodemonOptions, execMap) {
  if (!execMap) {
    execMap = {};
  }

  var options = utils.clone(nodemonOptions || {});
  var script;

  // if there's no script passed, try to get it from the first argument
  if (!options.script && (options.args || []).length) {
    script = expandScript(
      options.args[0],
      options.ext && '.' + (options.ext || 'js').split(',')[0]
    );

    // if the script was found, shift it off our args
    if (script !== options.args[0]) {
      options.script = script;
      options.args.shift();
    }
  }

  // if there's no exec found yet, then try to read it from the local
  // package.json this logic used to sit in the cli/parse, but actually the cli
  // should be parsed first, then the user options (via nodemon.json) then
  // finally default down to pot shots at the directory via package.json
  if (!options.exec && !options.script) {
    var found = execFromPackage();
    if (found !== null) {
      if (found.exec) {
        options.exec = found.exec;
      }
      if (!options.script) {
        options.script = found.script;
      }
      if (Array.isArray(options.args) && options.scriptPosition === null) {
        options.scriptPosition = options.args.length;
      }
    }
  }

  // var options = utils.clone(nodemonOptions || {});
  script = path.basename(options.script || '');

  var scriptExt = path.extname(script).slice(1);

  var extension = options.ext;
  if (extension === undefined) {
    var isJS = scriptExt === 'js' || scriptExt === 'mjs' || scriptExt === 'cjs';
    extension = isJS || !scriptExt ? 'js,mjs,cjs' : scriptExt;
    extension += ',json'; // Always watch JSON files
  }

  var execDefined = !!options.exec;

  // allows the user to simplify cli usage:
  // https://github.com/remy/nodemon/issues/195
  // but always give preference to the user defined argument