overlay.js
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'use strict'; // The error overlay is inspired (and mostly copied) from Create React App (https://github.com/facebookincubator/create-react-app)
// They, in turn, got inspired by webpack-hot-middleware (https://github.com/glenjamin/webpack-hot-middleware).
var ansiHTML = require('ansi-html');
var _require = require('html-entities'),
AllHtmlEntities = _require.AllHtmlEntities;
var entities = new AllHtmlEntities();
var colors = {
reset: ['transparent', 'transparent'],
black: '181818',
red: 'E36049',
green: 'B3CB74',
yellow: 'FFD080',
blue: '7CAFC2',
magenta: '7FACCA',
cyan: 'C3C2EF',
lightgrey: 'EBE7E3',
darkgrey: '6D7891'
};
var overlayIframe = null;
var overlayDiv = null;
var lastOnOverlayDivReady = null;
ansiHTML.setColors(colors);
function createOverlayIframe(onIframeLoad) {
var iframe = document.createElement('iframe');
iframe.id = 'webpack-dev-server-client-overlay';
iframe.src = 'about:blank';
iframe.style.position = 'fixed';
iframe.style.left = 0;
iframe.style.top = 0;
iframe.style.right = 0;
iframe.style.bottom = 0;
iframe.style.width = '100vw';
iframe.style.height = '100vh';
iframe.style.border = 'none';
iframe.style.zIndex = 9999999999;
iframe.onload = onIframeLoad;
return iframe;
}
function addOverlayDivTo(iframe) {
var div = iframe.contentDocument.createElement('div');
div.id = 'webpack-dev-server-client-overlay-div';
div.style.position = 'fixed';
div.style.boxSizing = 'border-box';
div.style.left = 0;
div.style.top = 0;
div.style.right = 0;
div.style.bottom = 0;
div.style.width = '100vw';
div.style.height = '100vh';
div.style.backgroundColor = 'rgba(0, 0, 0, 0.85)';
div.style.color = '#E8E8E8';
div.style.fontFamily = 'Menlo, Consolas, monospace';
div.style.fontSize = 'large';
div.style.padding = '2rem';
div.style.lineHeight = '1.2';
div.style.whiteSpace = 'pre-wrap';
div.style.overflow = 'auto';
iframe.contentDocument.body.appendChild(div);
return div;
}
function ensureOverlayDivExists(onOverlayDivReady) {
if (overlayDiv) {
// Everything is ready, call the callback right away.
onOverlayDivReady(overlayDiv);
return;
} // Creating an iframe may be asynchronous so we'll schedule the callback.
// In case of multiple calls, last callback wins.
lastOnOverlayDivReady = onOverlayDivReady;
if (overlayIframe) {
// We've already created it.
return;
} // Create iframe and, when it is ready, a div inside it.
overlayIframe = createOverlayIframe(function () {
overlayDiv = addOverlayDivTo(overlayIframe); // Now we can talk!
lastOnOverlayDivReady(overlayDiv);
}); // Zalgo alert: onIframeLoad() will be called either synchronously
// or asynchronously depending on the browser.
// We delay adding it so `overlayIframe` is set when `onIframeLoad` fires.
document.body.appendChild(overlayIframe);
} // Successful compilation.
function clear() {
if (!overlayDiv) {
// It is not there in the first place.
return;
} // Clean up and reset internal state.
document.body.removeChild(overlayIframe);
overlayDiv = null;
overlayIframe = null;
lastOnOverlayDivReady = null;
} // Compilation with errors (e.g. syntax error or missing modules).
function showMessage(messages) {
ensureOverlayDivExists(function (div) {
// Make it look similar to our terminal.
div.innerHTML = "<span style=\"color: #".concat(colors.red, "\">Failed to compile.</span><br><br>").concat(ansiHTML(entities.encode(messages[0])));
});
}
module.exports = {
clear: clear,
showMessage: showMessage
};