Search modules

search-modules.js

var Modules = new Map();

function addModule(id, searchFn) {
  if (Modules.has(id)) {
    throw 'Error: module: ' + id + ' already exists.';
  }
  Modules.set(id, searchFn);
}

function searchFn(id, query) {
  if (!Modules.has(id)) {
    throw 'Error: unknown module: ' + id;
  }

  return new Promise((resolve) => {
    Modules.get(id)(query, resolve);
  });
}