@platformos/pos-cli
Version:
Manage your platformOS application
182 lines • 5.71 kB
JavaScript
Object.defineProperty(exports, "__esModule", { value: true });
var logger_1 = require("./logger");
var misc_1 = require("./misc");
/**
* Tells whether current environment supports ErrorEvent objects
* {@link supportsErrorEvent}.
*
* @returns Answer to the given question.
*/
function supportsErrorEvent() {
try {
// tslint:disable:no-unused-expression
new ErrorEvent('');
return true;
}
catch (e) {
return false;
}
}
exports.supportsErrorEvent = supportsErrorEvent;
/**
* Tells whether current environment supports DOMError objects
* {@link supportsDOMError}.
*
* @returns Answer to the given question.
*/
function supportsDOMError() {
try {
// It really needs 1 argument, not 0.
// Chrome: VM89:1 Uncaught TypeError: Failed to construct 'DOMError':
// 1 argument required, but only 0 present.
// @ts-ignore
// tslint:disable:no-unused-expression
new DOMError('');
return true;
}
catch (e) {
return false;
}
}
exports.supportsDOMError = supportsDOMError;
/**
* Tells whether current environment supports DOMException objects
* {@link supportsDOMException}.
*
* @returns Answer to the given question.
*/
function supportsDOMException() {
try {
// tslint:disable:no-unused-expression
new DOMException('');
return true;
}
catch (e) {
return false;
}
}
exports.supportsDOMException = supportsDOMException;
/**
* Tells whether current environment supports Fetch API
* {@link supportsFetch}.
*
* @returns Answer to the given question.
*/
function supportsFetch() {
if (!('fetch' in misc_1.getGlobalObject())) {
return false;
}
try {
// tslint:disable-next-line:no-unused-expression
new Headers();
// tslint:disable-next-line:no-unused-expression
new Request('');
// tslint:disable-next-line:no-unused-expression
new Response();
return true;
}
catch (e) {
return false;
}
}
exports.supportsFetch = supportsFetch;
/**
* isNativeFetch checks if the given function is a native implementation of fetch()
*/
function isNativeFetch(func) {
return func && /^function fetch\(\)\s+\{\s+\[native code\]\s+\}$/.test(func.toString());
}
/**
* Tells whether current environment supports Fetch API natively
* {@link supportsNativeFetch}.
*
* @returns true if `window.fetch` is natively implemented, false otherwise
*/
function supportsNativeFetch() {
if (!supportsFetch()) {
return false;
}
var global = misc_1.getGlobalObject();
// Fast path to avoid DOM I/O
// tslint:disable-next-line:no-unbound-method
if (isNativeFetch(global.fetch)) {
return true;
}
// window.fetch is implemented, but is polyfilled or already wrapped (e.g: by a chrome extension)
// so create a "pure" iframe to see if that has native fetch
var result = false;
var doc = global.document;
if (doc) {
try {
var sandbox = doc.createElement('iframe');
sandbox.hidden = true;
doc.head.appendChild(sandbox);
if (sandbox.contentWindow && sandbox.contentWindow.fetch) {
// tslint:disable-next-line:no-unbound-method
result = isNativeFetch(sandbox.contentWindow.fetch);
}
doc.head.removeChild(sandbox);
}
catch (err) {
logger_1.logger.warn('Could not create sandbox iframe for pure fetch check, bailing to window.fetch: ', err);
}
}
return result;
}
exports.supportsNativeFetch = supportsNativeFetch;
/**
* Tells whether current environment supports ReportingObserver API
* {@link supportsReportingObserver}.
*
* @returns Answer to the given question.
*/
function supportsReportingObserver() {
// tslint:disable-next-line: no-unsafe-any
return 'ReportingObserver' in misc_1.getGlobalObject();
}
exports.supportsReportingObserver = supportsReportingObserver;
/**
* Tells whether current environment supports Referrer Policy API
* {@link supportsReferrerPolicy}.
*
* @returns Answer to the given question.
*/
function supportsReferrerPolicy() {
// Despite all stars in the sky saying that Edge supports old draft syntax, aka 'never', 'always', 'origin' and 'default
// https://caniuse.com/#feat=referrer-policy
// It doesn't. And it throw exception instead of ignoring this parameter...
// REF: https://github.com/getsentry/raven-js/issues/1233
if (!supportsFetch()) {
return false;
}
try {
// tslint:disable:no-unused-expression
new Request('_', {
referrerPolicy: 'origin',
});
return true;
}
catch (e) {
return false;
}
}
exports.supportsReferrerPolicy = supportsReferrerPolicy;
/**
* Tells whether current environment supports History API
* {@link supportsHistory}.
*
* @returns Answer to the given question.
*/
function supportsHistory() {
// NOTE: in Chrome App environment, touching history.pushState, *even inside
// a try/catch block*, will cause Chrome to output an error to console.error
// borrowed from: https://github.com/angular/angular.js/pull/13945/files
var global = misc_1.getGlobalObject();
var chrome = global.chrome;
// tslint:disable-next-line:no-unsafe-any
var isChromePackagedApp = chrome && chrome.app && chrome.app.runtime;
var hasHistoryApi = 'history' in global && !!global.history.pushState && !!global.history.replaceState;
return !isChromePackagedApp && hasHistoryApi;
}
exports.supportsHistory = supportsHistory;
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