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Develop (#250)
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Lea Anthony
GitHub
217
runtime/assets/bridge.js
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217
runtime/assets/bridge.js
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/*
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_ __ _ __
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| | / /___ _(_) /____
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| | /| / / __ `/ / / ___/
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| |/ |/ / /_/ / / (__ )
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|__/|__/\__,_/_/_/____/
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The lightweight framework for web-like apps
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(c) Lea Anthony 2019-present
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*/
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/* jshint esversion: 6 */
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function init() {
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// Bridge object
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window.wailsbridge = {
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reconnectOverlay: null,
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reconnectTimer: 300,
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wsURL: 'ws://localhost:34115/bridge',
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connectionState: null,
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config: {},
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websocket: null,
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callback: null,
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overlayHTML:
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'<div class="wails-reconnect-overlay"><div class="wails-reconnect-overlay-content"><div class="wails-reconnect-overlay-title">Wails Bridge</div><br><div class="wails-reconnect-overlay-loadingspinner"></div><br><div id="wails-reconnect-overlay-message">Waiting for backend</div></div></div>',
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overlayCSS:
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'.wails-reconnect-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);font-family:sans-serif;display:none;z-index:999999}.wails-reconnect-overlay-content{padding:20px 30px;text-align:center;width:20em;position:relative;height:14em;border-radius:1em;margin:5% auto 0;background-color:#fff;box-shadow:1px 1px 20px 3px;background-image:url(data:image/png;base64,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);background-repeat:no-repeat;background-position:center}.wails-reconnect-overlay-title{font-size:2em}.wails-reconnect-overlay-message{font-size:1.3em}.wails-reconnect-overlay-loadingspinner{pointer-events:none;width:2.5em;height:2.5em;border:.4em solid transparent;border-color:#3E67EC #eee #eee;border-radius:50%;animation:loadingspin 1s linear infinite;margin:auto;padding:2.5em}@keyframes loadingspin{100%{transform:rotate(360deg)}}',
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log: function (message) {
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// eslint-disable-next-line
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console.log(
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'%c wails bridge %c ' + message + ' ',
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'background: #aa0000; color: #fff; border-radius: 3px 0px 0px 3px; padding: 1px; font-size: 0.7rem',
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'background: #009900; color: #fff; border-radius: 0px 3px 3px 0px; padding: 1px; font-size: 0.7rem'
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);
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}
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};
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}
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// Adapted from webview - thanks zserge!
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function injectCSS(css) {
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var elem = document.createElement('style');
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elem.setAttribute('type', 'text/css');
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if (elem.styleSheet) {
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elem.styleSheet.cssText = css;
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} else {
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elem.appendChild(document.createTextNode(css));
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}
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var head = document.head || document.getElementsByTagName('head')[0];
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head.appendChild(elem);
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}
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// Creates a node in the Dom
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function createNode(parent, elementType, id, className, content) {
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var d = document.createElement(elementType);
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if (id) {
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d.id = id;
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}
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if (className) {
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d.className = className;
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}
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if (content) {
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d.innerHTML = content;
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}
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parent.appendChild(d);
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return d;
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}
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// Sets up the overlay
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function setupOverlay() {
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var body = document.body;
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var wailsBridgeNode = createNode(body, 'div', 'wails-bridge');
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wailsBridgeNode.innerHTML = window.wailsbridge.overlayHTML;
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// Inject the overlay CSS
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injectCSS(window.wailsbridge.overlayCSS);
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}
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// Start the Wails Bridge
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function startBridge() {
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// Setup the overlay
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setupOverlay();
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window.wailsbridge.websocket = null;
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window.wailsbridge.connectTimer = null;
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window.wailsbridge.reconnectOverlay = document.querySelector(
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'.wails-reconnect-overlay'
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);
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window.wailsbridge.connectionState = 'disconnected';
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// Shows the overlay
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function showReconnectOverlay() {
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window.wailsbridge.reconnectOverlay.style.display = 'block';
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}
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// Hides the overlay
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function hideReconnectOverlay() {
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window.wailsbridge.reconnectOverlay.style.display = 'none';
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}
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// Bridge external.invoke
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window.external = {
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invoke: function (msg) {
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window.wailsbridge.websocket.send(msg);
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}
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};
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// Adds a script to the Dom.
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// Removes it if second parameter is true.
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function addScript(script, remove) {
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var s = document.createElement('script');
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s.setAttribute('type', 'text/javascript');
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s.textContent = script;
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document.head.appendChild(s);
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// Remove internal messages from the DOM
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if (remove) {
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s.parentNode.removeChild(s);
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}
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}
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// Handles incoming websocket connections
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function handleConnect() {
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window.wailsbridge.log('Connected to backend');
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hideReconnectOverlay();
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clearInterval(window.wailsbridge.connectTimer);
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window.wailsbridge.websocket.onclose = handleDisconnect;
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window.wailsbridge.websocket.onmessage = handleMessage;
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window.wailsbridge.connectionState = 'connected';
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}
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// Handles websocket disconnects
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function handleDisconnect() {
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window.wailsbridge.log('Disconnected from backend');
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window.wailsbridge.websocket = null;
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window.wailsbridge.connectionState = 'disconnected';
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showReconnectOverlay();
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connect();
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}
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// Try to connect to the backend every 300ms (default value).
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// Change this value in the main wailsbridge object.
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function connect() {
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window.wailsbridge.connectTimer = setInterval(function () {
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if (window.wailsbridge.websocket == null) {
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window.wailsbridge.websocket = new WebSocket(window.wailsbridge.wsURL);
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window.wailsbridge.websocket.onopen = handleConnect;
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window.wailsbridge.websocket.onerror = function (e) {
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e.stopImmediatePropagation();
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e.stopPropagation();
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e.preventDefault();
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window.wailsbridge.websocket = null;
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return false;
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};
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}
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}, window.wailsbridge.reconnectTimer);
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}
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function handleMessage(message) {
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// As a bridge we ignore js and css injections
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switch (message.data[0]) {
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// Wails library - inject!
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case 'w':
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addScript(message.data.slice(1));
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// Now wails runtime is loaded, wails for the ready event
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// and callback to the main app
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window.wails.Events.On('wails:loaded', function () {
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window.wailsbridge.log('Wails Ready');
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if (window.wailsbridge.callback) {
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window.wailsbridge.log('Notifying application');
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window.wailsbridge.callback(window.wails);
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}
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});
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window.wailsbridge.log('Loaded Wails Runtime');
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break;
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// Notifications
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case 'n':
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addScript(message.data.slice(1), true);
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break;
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// Binding
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case 'b':
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var binding = message.data.slice(1);
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//log("Binding: " + binding)
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window.wails._.NewBinding(binding);
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break;
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// Call back
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case 'c':
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var callbackData = message.data.slice(1);
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window.wails._.Callback(callbackData);
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break;
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default:
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window.wails.Log.Error('Unknown message type received: ' + message.data[0]);
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}
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}
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// Start by showing the overlay...
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showReconnectOverlay();
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// ...and attempt to connect
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connect();
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}
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function start(callback) {
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// Set up the bridge
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init();
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// Save the callback
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window.wailsbridge.callback = callback;
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// Start Bridge
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startBridge();
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}
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function Init(callback) {
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start(callback);
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}
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module.exports = Init;
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