Move code that defines ipcRenderer methods into another file.

lib/renderer/api/ipc-renderer-setup.js

@@ -0,0 +1,29 @@
+module.exports = function (ipcRenderer, binding) {
+  ipcRenderer.send = function (...args) {
+    return binding.send('ipc-message', args)
+  }
+
+  ipcRenderer.sendSync = function (...args) {
+    return JSON.parse(binding.sendSync('ipc-message-sync', args))
+  }
+
+  ipcRenderer.sendToHost = function (...args) {
+    return binding.send('ipc-message-host', args)
+  }
+
+  ipcRenderer.sendTo = function (webContentsId, channel, ...args) {
+    if (typeof webContentsId !== 'number') {
+      throw new TypeError('First argument has to be webContentsId')
+    }
+
+    ipcRenderer.send('ELECTRON_BROWSER_SEND_TO', false, webContentsId, channel, ...args)
+  }
+
+  ipcRenderer.sendToAll = function (webContentsId, channel, ...args) {
+    if (typeof webContentsId !== 'number') {
+      throw new TypeError('First argument has to be webContentsId')
+    }
+
+    ipcRenderer.send('ELECTRON_BROWSER_SEND_TO', true, webContentsId, channel, ...args)
+  }
+}