text: let shim = {};
  
  shim.isNode = () => {
  	if (typeof process === 'undefined') return false;
  	if (shim.isElectron()) return true;
  	return process.title == 'node';
  };
  
  shim.isReactNative = () => {
  	if (typeof navigator === 'object' && typeof navigator.userAgent === 'string' && navigator.userAgent.indexOf('ReactNativeDebugger') >= 0) {
  		return true;
  	}
  
  	return !shim.isNode();
  };
  
  shim.isLinux = () => {
  	return process && process.platform === 'linux';
  };
  
  shim.isFreeBSD = () => {
  	return process && process.platform === 'freebsd';
  };
  
  shim.isWindows = () => {
  	return process && process.platform === 'win32';
  };
  
  shim.isMac = () => {
  	return process && process.platform === 'darwin';
  };
  
  shim.platformName = function() {
  	if (shim.isReactNative()) return 'mobile';
  	if (shim.isMac()) return 'darwin';
  	if (shim.isWindows()) return 'win32';
  	if (shim.isLinux()) return 'linux';
  	if (shim.isFreeBSD()) return 'freebsd';
  	throw new Error('Cannot determine platform');
  };
  
  // https://github.com/cheton/is-electron
  shim.isElectron = () => {
  	// Renderer process
  	if (typeof window !== 'undefined' && typeof window.process === 'object' && window.process.type === 'renderer') {
  		return true;
  	}
  
  	// Main process
  	if (typeof process !== 'undefined' && typeof process.versions === 'object' && !!process.versions.electron) {
  		return true;
  	}
  
  	// Detect the user agent when the `nodeIntegration` option is set to true
  	if (typeof navigator === 'object' && typeof navigator.userAgent === 'string' && navigator.userAgent.indexOf('Electron') >= 0) {
  		return true;
  	}
  
  	return false;
  };
  
  shim.isPortable = function() {
  	return typeof process !== 'undefined' && typeof process.env === 'object' && !!process.env.PORTABLE_EXECUTABLE_DIR;
  };
  
  // Node requests can go wrong is so many different ways and with so
  // many different error messages... This handler inspects the error
  // and decides whether the request can safely be repeated or not.
  shim.fetchRequestCanBeRetried = function(error) {
  	if (!error) return false;
  
  	// Unfortunately the error 'Network request failed' doesn't have a type
  	// or error code, so hopefully that message won't change and is not localized
  	if (error.message == 'Network request failed') return true;
  
  	// request to https://public-ch3302....1fab24cb1bd5f.md failed, reason: socket hang up"
  	if (error.code == 'ECONNRESET') return true;
  
  	// OneDrive (or Node?) sometimes sends back a "not found" error for resources
  	// that definitely exist and in this case repeating the request works.
  	// Error is:
  	// request to https://graph.microsoft.com/v1.0/drive/special/approot failed, reason: getaddrinfo ENOTFOUND graph.microsoft.com graph.microsoft.com:443
  	if (error.code == 'ENOTFOUND') return true;
  
  	// network timeout at: https://public-ch3302...859f9b0e3ab.md
  	if (error.message && error.message.indexOf('network timeout') === 0) return true;
  
  	// name: 'FetchError',
  	// message: 'request to https://api.ipify.org/?format=json failed, reason: getaddrinfo EAI_AGAIN api.ipify.org:443',
  	// type: 'system',
  	// errno: 'EAI_AGAIN',
  	// code: 'EAI_AGAIN' } } reason: { FetchError: request to https://api.ipify.org/?format=json failed, reason: getaddrinfo EAI_AGAIN api.ipify.org:443
  	//
  	// It's a Microsoft error: "A temporary failure in name resolution occurred."
  	if (error.code == 'EAI_AGAIN') return true;
  
  	// request to https://public-...8fd8bc6bb68e9c4d17a.md failed, reason: connect ETIMEDOUT 204.79.197.213:443
  	// Code: ETIMEDOUT
  	if (error.code === 'ETIMEDOUT') return true;
  
  	// ECONNREFUSED is generally temporary
  	if (error.code === 'ECONNREFUSED') return true;
  
  	return false;
  };
  
  shim.fetchMaxRetry_ = 5;
  
  shim.fetchMaxRetrySet = v => {
  	const previous = shim.fetchMaxRetry_;
  	shim.fetchMaxRetry_ = v;
  	return previous;
  };
  
  shim.fetchWithRetry = async function(fetchFn, options = null) {
  	const { time } = require('lib/time-utils.js');
  
  	if (!options) options = {};
  	if (!options.timeout) options.timeout = 1000 * 120; // ms
  	if (!('maxRetry' in options)) options.maxRetry = shim.fetchMaxRetry_;
  
  	let retryCount = 0;
  	while (true) {
  		try {
  			const response = await fetchFn();
  			return response;
  		} catch (error) {
  			if (shim.fetchRequestCanBeRetried(error)) {
  				retryCount++;
  				if (retryCount > options.maxRetry) throw error;
  				await time.sleep(retryCount * 3);
  			} else {
  				throw error;
  			}
  		}
  	}
  };
  
  shim.fetch = () => {
  	throw new Error('Not implemented');
  };
  shim.FormData = typeof FormData !== 'undefined' ? FormData : null;
  shim.fsDriver = () => {
  	throw new Error('Not implemented');
  };
  shim.FileApiDriverLocal = null;
  
  shim.readLocalFileBase64 = path => {
  	throw new Error('Not implemented');
  };
  
  shim.uploadBlob = () => {
  	throw new Error('Not implemented');
  };
  
  shim.sjclModule = null;
  
  shim.randomBytes = async count => {
  	throw new Error('Not implemented');
  };
  
  shim.setInterval = function(fn, interval) {
  	return setInterval(fn, interval);
  };
  
  shim.clearInterval = function(id) {
  	return clearInterval(id);
  };
  
  shim.stringByteLength = function(string) {
  	throw new Error('Not implemented');
  };
  
  shim.detectAndSetLocale = null;
  
  shim.attachFileToNote = async (note, filePath) => {};
  
  shim.imageFromDataUrl = async function(imageDataUrl, filePath) {
  	throw new Error('Not implemented');
  };
  shim.Buffer = null;
  shim.openUrl = () => {
  	throw new Error('Not implemented');
  };
  shim.waitForFrame = () => {
  	throw new Error('Not implemented');
  };
  
  shim.injectedJs = name => '';
  
  shim.loadCssFromJs = name => {
  	throw new Error('Not implemented');
  };
  
  module.exports = { shim };
  