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【Rails】Rails6でのjQueryを使うときのwebpackerの設定

Posted at

初めに

Rails6でのwebpacker の設定が分からなくなっていたのでここで書き残しておきます。

環境

  • Rails 6.1.4
  • Ruby 2.7.4
  • webpacker 5.4.3

webpacker

Rails6 の javascript の設定は config/webpacke の下にあるファイルで行います。
今回は jquery が使えるようにします。

enviroment.js

config/webpack/environment.js
const { environment } = require("@rails/webpacker");

const webpack = require("webpack");

environment.plugins.prepend(
  "Provide",
  new webpack.ProvidePlugin({
    $: "jquery",
    jQuery: "jquery",
    jquery: "jquery",
    Popper: ["popper.js", "default"],
  })
);
module.exports = environment;

application.js

javasccript/packs/application.js

require("@rails/ujs").start();
require("turbolinks").start();
require("@rails/activestorage").start();
require("channels");

import $ from "jquery/dist/jquery.js

globalThis.jQuery = $;
globalThis.$ = $;

これで jquery がエラーなく動きます。

参考

Issue loading jQuery in Webpacker 5- stackoverflow

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