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method-chooser.js
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Fri, Jan 24, 12:31

method-chooser.js
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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
const 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
*/
const 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) {
let 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;
}
const ret = chooseMethods.find(m => 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(m => m.type !== 'idb');
}
const useMethod = chooseMethods.find(method => method.canBeUsed());
if (!useMethod)
throw new Error('No useable methode found:' + JSON.stringify(METHODS.map(m => m.type)));
else
return useMethod;
}

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