66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
import NativeMethod from './methods/native.js';
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import IndexeDbMethod from './methods/indexed-db.js';
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import LocalstorageMethod from './methods/localstorage.js';
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import SimulateMethod from './methods/simulate.js';
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import { isNode } from './util'; // order is important
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var METHODS = [NativeMethod, // fastest
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IndexeDbMethod, LocalstorageMethod];
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/**
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* The NodeMethod is loaded lazy
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* so it will not get bundled in browser-builds
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*/
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if (isNode) {
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/**
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* we use the non-transpiled code for nodejs
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* because it runs faster
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*/
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var NodeMethod = require('../../src/methods/' + // use this hack so that browserify and others
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// do not import the node-method by default
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// when bundling.
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'node.js');
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/**
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* this will be false for webpackbuilds
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* which will shim the node-method with an empty object {}
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*/
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if (typeof NodeMethod.canBeUsed === 'function') {
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METHODS.push(NodeMethod);
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}
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}
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export function chooseMethod(options) {
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var chooseMethods = [].concat(options.methods, METHODS).filter(Boolean); // directly chosen
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if (options.type) {
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if (options.type === 'simulate') {
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// only use simulate-method if directly chosen
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return SimulateMethod;
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}
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var ret = chooseMethods.find(function (m) {
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return m.type === options.type;
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});
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if (!ret) throw new Error('method-type ' + options.type + ' not found');else return ret;
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}
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/**
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* if no webworker support is needed,
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* remove idb from the list so that localstorage is been chosen
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*/
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if (!options.webWorkerSupport && !isNode) {
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chooseMethods = chooseMethods.filter(function (m) {
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return m.type !== 'idb';
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});
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}
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var useMethod = chooseMethods.find(function (method) {
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return method.canBeUsed();
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});
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if (!useMethod) throw new Error('No useable methode found:' + JSON.stringify(METHODS.map(function (m) {
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return m.type;
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})));else return useMethod;
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} |