Question

我正在尝试使用webpacker＆amp;和rails进行服务器端渲染反应护栏。我对客户端呈现没有任何问题，但我在服务器端呈现时遇到以下异常。

ExecJS::ProgramError in Static#index

identifier 'Set' undefined

application.html.erb

<!DOCTYPE html>
<html>
  <head>
    <title>ReactExample</title>
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
    <%= javascript_pack_tag 'application' %>
  </head>

  <body>
    <%= yield %>
  </body>
</html>

index.html.erb

<%= react_component('hello', {}, {prerender: true}) %>

的application.js

/* eslint no-console:0 */
// This file is automatically compiled by Webpack, along with any other files
// present in this directory. You're encouraged to place your actual application logic in
// a relevant structure within app/javascript and only use these pack files to reference
// that code so it'll be compiled.
//
// To reference this file, add <%= javascript_pack_tag 'application' %> to the appropriate
// layout file, like app/views/layouts/application.html.erb

// Support component names relative to this directory:
var componentRequireContext = require.context("components", true)
var ReactRailsUJS = require("react_ujs")
ReactRailsUJS.useContext(componentRequireContext)

server_rendering.js

// By default, this pack is loaded for server-side rendering.
// It must expose react_ujs as `ReactRailsUJS` and prepare a require context.
var componentRequireContext = require.context("components", true)
var ReactRailsUJS = require("react_ujs")
ReactRailsUJS.useContext(componentRequireContext)

Answer 1

从TheRubyRacer升级到现代的JavaScript执行引擎。

TheRubyRacer依赖LibV8（为node.js供电的位），但它是locked to version 3，LibV8本身已经在version 7。

使用现代的JS宝石，例如Mini_Racer，这个问题就消失了。

React Rails“标识符'设置'未定义”

1 个答案: