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method-chooser.js
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Mon, Feb 3, 16:53

method-chooser.js

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;
}

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