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我有一个 Rails 6.1 应用程序，它是从 Rails 4 -> 5 -> 6 升级的，所以它很成熟。

它仍然使用资产管道，并且随着 Rails 7.0 的未来，我将保持这种方式。我想开始使用stimulus + importmaps，所以我跟着安装。

通过热线安装导入映射和刺激后，我在加载我的应用程序时在 Firefox 91 中收到以下错误；

Uncaught SyntaxError: import declarations may only appear at top level of a module
Uncaught TypeError: Error resolving module specifier “application”. Relative module specifiers must start with “./”, “../” or “/”.

我的 importmap.rb

Rails.application.config.importmap.draw do
  pin "@hotwired/stimulus", to: "stimulus.js"
  pin "@hotwired/stimulus-importmap-autoloader", to: "stimulus-importmap-autoloader.js"
  pin_all_from "app/javascript/controllers", under: "controllers"

  pin "application"

  # Use libraries available via the asset pipeline (locally or via gems). # Rails 7.0 required
  # pin "@rails/actioncable", to: "actioncable.esm.js"     
  # pin "@rails/activestorage", to: "activestorage.esm.js" 

  # Use libraries directly from JavaScript CDNs (see https://www.skypack.dev, https://esm.sh, https://www.jsdelivr.com/esm)
  # pin "vue", to: "https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.esm.browser.js"
  # pin "d3", to: "https://esm.sh/d3?bundle"

  # Pin vendored modules by first adding the following to app/assets/config/manifest.js:
  # //= link_tree ../../../vendor/assets/javascripts .js
  # pin_all_from "vendor/assets/javascripts"
end

我已将所有 javascript 保存在 app/assets/javascripts 目录中，该目录仍应由资产管道处理。

我有以下 app/assets/javascripts/importmap.json.erb

{
  "imports": { 
    "turbo": "<%= asset_path "turbo" %>",
    <%= importmap_list_with_stimulus_from "app/assets/javascripts/controllers", "app/assets/javascripts/libraries" %>
  }
}

application.js 是；

// This is the main application.js, there can only be one.
//
// Configure your import map in config/importmap.rb

// import "@rails/actioncable"   // Rails 7.0 required
// import "@rails/activestorage" // Rails 7.0 required

import "@hotwired/stimulus-importmap-autoloader"

我的 application.html.erb 中也有以下行

<%= stylesheet_link_tag    "application" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
<%= javascript_include_tag "turbo", type: "module-shim" %>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<%= yield :head %>
<%= javascript_importmap_tags %>

manifest.js 是；

//= link_tree ../images
//= link_directory ../javascripts .js
//= link_directory ../stylesheets .css
//= link_tree ../javascripts

编辑

检查 Chrome 中的 Elements 选项卡，我已经加载了 es-module-shims 但在 Firefox 中我仍然收到错误；

Uncaught SyntaxError: import declarations may only appear at top level of a module
Uncaught TypeError: Error resolving module specifier “application”. Relative module specifiers must start with “./”, “../” or “/”.

这是加载 es-module-shim 的代码

<script src="/assets/es-module-shims-e320a414bc4656be79c9c722c91afd9bc40140edf48616fbf72fb2da3c1fdcaa.js" async="async" data-turbo-track="reload"></script>
<script type="module">import "application"</script>

编辑

可以安全地忽略以下错误；

Uncaught TypeError: Error resolving module specifier “application”. Relative module specifiers must start with “./”, “../” or “/”.

参考：https ://github.com/rails/importmap-rails#expected-errors-from-using-the-es-module-shim

编辑

当我将 application.html.erb 头更改为以下内容时，另一个错误消失了

<%= csrf_meta_tags %>
<%= csp_meta_tag %>

<%= stylesheet_link_tag    "application" %>
<%= javascript_importmap_tags %>

<meta name="viewport" content="width=device-width, initial-scale=1.0">
<%= yield :head %>
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1 回答 1

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Firefox 本身不支持导入映射。您需要从https://github.com/guybedford/es-module-shims添加一个 polyfill 。

于 2021-08-23T14:18:40.720 回答