scriptable-require.js

var _require_cache_ = {};
function require(name) {
  let local = FileManager.local();
  
  // look for script with the given name in iCloud documents
  // and current directory adding .js to filename is not present
  let resolve = function(name) {    
    var filename = name;
    if(name.indexOf('.js') < 0) {
      filename += '.js';
    }
    
    const docs = "/var/mobile/Library/Mobile Documents/iCloud~dk~simonbs~Scriptable/Documents/";
    let paths = [docs, '']; // TODO: Maybe add directory of calling script and shared module directory to paths
    for (var k = 0; k < paths.length; ++k) {
      let resolved = paths[k] + filename;
      if(local.fileExists(resolved)) return resolved;
    } 
    
    throw "unable to find '" + filename + "'";
  };  
  
  // fetch object from either cache or filesystem
  let procure = function(path) {
    // check if we have this module cached
    let cache = _require_cache_;
    if(cache[path]) return cache[path];
    
    // load and evaluate from filesystem 
    let content = local.readString(path);
    var inner = new Function('exports', content);
    var exports = {};
    inner(exports);
    
    // cache for next procurement
    cache[path] = exports;
    
    return exports;
  };
  
  let path = resolve(name);
  return procure(path);
};