🐛 Add support for TypedArrays in IPC.

Fixes https://github.com/electron/electron/issues/2104.

lib/browser/rpc-server.js

@@ -2,7 +2,7 @@
 
 const electron = require('electron')
 const v8Util = process.atomBinding('v8_util')
-const {ipcMain, isPromise, webContents} = electron
+const {ipcMain, isPromise, isTypedArray, webContents} = electron
 
 const objectsRegistry = require('./objects-registry')
 
@@ -63,6 +63,8 @@ let valueToMeta = function (sender, value, optimizeSimpleObject = false) {
       meta.type = 'buffer'
     } else if (Array.isArray(value)) {
       meta.type = 'array'
+    } else if (isTypedArray(value.buffer)) {
+      meta.type = 'typed-array'
     } else if (value instanceof Error) {
       meta.type = 'error'
     } else if (value instanceof Date) {
@@ -149,6 +151,8 @@ const unwrapArgs = function (sender, args) {
         return unwrapArgs(sender, meta.value)
       case 'buffer':
         return new Buffer(meta.value)
+      case 'typed-array':
+        return Buffer.from(meta.value)
       case 'date':
         return new Date(meta.value)
       case 'promise':

lib/common/api/is-typed-array.js

@@ -0,0 +1,16 @@
+'use strict'
+
+module.exports = function isTypedArray(val) {
+  return (
+    val &&
+    (val instanceof Int8Array
+    || val instanceof Int16Array
+    || val instanceof Int32Array
+    || val instanceof Uint8Array
+    || val instanceof Uint8ClampedArray
+    || val instanceof Uint16Array
+    || val instanceof Uint32Array
+    || val instanceof Float32Array
+    || val instanceof Float64Array)
+  )
+}

lib/renderer/api/remote.js

@@ -1,7 +1,7 @@
 'use strict'
 
 const v8Util = process.atomBinding('v8_util')
-const {ipcRenderer, isPromise, CallbacksRegistry} = require('electron')
+const {ipcRenderer, isPromise, isTypedArray, CallbacksRegistry} = require('electron')
 
 const callbacksRegistry = new CallbacksRegistry()
 
@@ -35,6 +35,11 @@ const wrapArgs = function (args, visited) {
         type: 'buffer',
         value: Array.prototype.slice.call(value, 0)
       }
+    } else if (isTypedArray(value.buffer)) {
+      return {
+        type: 'typed-array',
+        value: Array.prototype.slice.call(value)
+      }
     } else if (value instanceof Date) {
       return {
         type: 'date',
@@ -164,6 +169,8 @@ const metaToValue = function (meta) {
       return results
     case 'buffer':
       return new Buffer(meta.value)
+    case 'typed-array':
+      return Buffer.from(meta.value)
     case 'promise':
       return Promise.resolve({
         then: metaToValue(meta.then)