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Viewing file:     method-chooser.js (1.87 KB)      -rw-r--r--

import NativeMethod from './methods/native.js';
import IndexeDbMethod from './methods/indexed-db.js';
import LocalstorageMethod from './methods/localstorage.js';
import SimulateMethod from './methods/simulate.js';
import { isNode } from './util'; // order is important

var METHODS = [NativeMethod, // fastest
IndexeDbMethod, LocalstorageMethod];
/**
 * The NodeMethod is loaded lazy
 * so it will not get bundled in browser-builds
 */

if (isNode) {
  /**
   * we use the non-transpiled code for nodejs
   * because it runs faster
   */
  var NodeMethod = require('../../src/methods/' + // use this hack so that browserify and others
  // do not import the node-method by default
  // when bundling.
  'node.js');
  /**
   * this will be false for webpackbuilds
   * which will shim the node-method with an empty object {}
   */


  if (typeof NodeMethod.canBeUsed === 'function') {
    METHODS.push(NodeMethod);
  }
}

export function chooseMethod(options) {
  var chooseMethods = [].concat(options.methods, METHODS).filter(Boolean); // directly chosen

  if (options.type) {
    if (options.type === 'simulate') {
      // only use simulate-method if directly chosen
      return SimulateMethod;
    }

    var ret = chooseMethods.find(function (m) {
      return m.type === options.type;
    });
    if (!ret) throw new Error('method-type ' + options.type + ' not found');else return ret;
  }
  /**
   * if no webworker support is needed,
   * remove idb from the list so that localstorage is been chosen
   */


  if (!options.webWorkerSupport && !isNode) {
    chooseMethods = chooseMethods.filter(function (m) {
      return m.type !== 'idb';
    });
  }

  var useMethod = chooseMethods.find(function (method) {
    return method.canBeUsed();
  });
  if (!useMethod) throw new Error('No useable methode found:' + JSON.stringify(METHODS.map(function (m) {
    return m.type;
  })));else return useMethod;
}