src -> packages

packages/preload/index.ts

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+import fs from 'fs'
+import { contextBridge, ipcRenderer, IpcRenderer } from 'electron'
+import { domReady } from './utils'
+import { useLoading } from './loading'
+
+const isDev = process.env.NODE_ENV === 'development'
+const { removeLoading, appendLoading } = useLoading()
+
+domReady().then(() => {
+  appendLoading()
+})
+
+
+// --------- Expose some API to Renderer process. ---------
+contextBridge.exposeInMainWorld('fs', fs)
+contextBridge.exposeInMainWorld('removeLoading', removeLoading)
+contextBridge.exposeInMainWorld('ipcRenderer', withPrototype(ipcRenderer))
+
+// `exposeInMainWorld` can not detect `prototype` attribute and methods, manually patch it.
+function withPrototype(obj: Record<string, any>) {
+  const protos = Object.getPrototypeOf(obj)
+
+  for (const [key, value] of Object.entries(protos)) {
+    if (Object.prototype.hasOwnProperty.call(obj, key)) continue
+
+    if (typeof value === 'function') {
+      // Some native API not work in Renderer-process, like `NodeJS.EventEmitter['on']`. Wrap a function patch it.
+      obj[key] = function (...args: any) {
+        return value.call(obj, ...args)
+      }
+    } else {
+      obj[key] = value
+    }
+  }
+  return obj
+}

packages/preload/loading.ts

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+
+
+/**
+ * https://tobiasahlin.com/spinkit
+ * https://connoratherton.com/loaders
+ * https://projects.lukehaas.me/css-loaders
+ * https://matejkustec.github.io/SpinThatShit
+ */
+export function useLoading() {
+  const className = `loaders-css__square-spin`
+  const styleContent = `
+@keyframes square-spin {
+  25% { transform: perspective(100px) rotateX(180deg) rotateY(0); }
+  50% { transform: perspective(100px) rotateX(180deg) rotateY(180deg); }
+  75% { transform: perspective(100px) rotateX(0) rotateY(180deg); }
+  100% { transform: perspective(100px) rotateX(0) rotateY(0); }
+}
+.${className} > div {
+  animation-fill-mode: both;
+  width: 50px;
+  height: 50px;
+  background: #fff;
+  animation: square-spin 3s 0s cubic-bezier(0.09, 0.57, 0.49, 0.9) infinite;
+}
+.app-loading-wrap {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100vw;
+  height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: #282c34;
+  z-index: 9;
+}
+    `
+  const oStyle = document.createElement('style')
+  const oDiv = document.createElement('div')
+
+  oStyle.id = 'app-loading-style'
+  oStyle.innerHTML = styleContent
+  oDiv.className = 'app-loading-wrap'
+  oDiv.innerHTML = `<div class="${className}"><div></div></div>`
+
+  return {
+    appendLoading() {
+      document.head.appendChild(oStyle)
+      document.body.appendChild(oDiv)
+    },
+    removeLoading() {
+      document.head.removeChild(oStyle)
+      document.body.removeChild(oDiv)
+    },
+  }
+}

packages/preload/utils.ts

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+
+/** docoment ready */
+export function domReady(condition: DocumentReadyState[] = ['complete', 'interactive']) {
+  return new Promise(resolve => {
+    if (condition.includes(document.readyState)) {
+      resolve(true)
+    } else {
+      document.addEventListener('readystatechange', () => {
+        if (condition.includes(document.readyState)) {
+          resolve(true)
+        }
+      })
+    }
+  })
+}