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How to import JS files with esbuild & jsbundling-rails

2022-04-29 09:58 Pseudo-Hippy imported from Stackoverflow

I'm moving a Rails 6 app from webpack & webpacker to esbuild & jsbundling-rails

I can't find any documentation on the correct way to import custom js files in application.js, if not using stimulus. Thanks.

1 answer

  • answered 2022-04-29 10:46 Joe Thor

    Verifying Set Up

    Once the jsbundling-rails gem is added to the Gemfile gem "jsbundling-rails" and installed (see the documentation on the repo for installation), you may need to start the javascript watcher with the command yarn build --watch.

    Adding Custom JavaScript

    You can add custom JavaScript to the /app/javascript directory and then link it on the application.js. Once the custom javascript is added, the bundler should compile the new fingerprinted javascript file in the /app/assets/build directory.

    Example

    Adding new.js to the /app/javascript

    //new.js

alert('hit')

    Linking new.js on the application.js

    //application.js
// Entry point for the build script in your package.json
import "@hotwired/turbo-rails"
// import "./controllers"
import * as bootstrap from "bootstrap"
import './new.js'

    In the terminal which started the watcher, after the new javascript is saved it outputs

    [watch] build started (change: "app/javascript/application.js")
[watch] build finished

    And there is now the following files in /app/assets/build

    //new.js
(() => {
  // app/javascript/new.js
  alert("hit");
})();
//# sourceMappingURL=new.js.map


    //new.js.map
{
  "version": 3,
  "sources": ["../../javascript/new.js"],
  "sourcesContent": ["alert('hit')"],
  "mappings": ";;AAAA,QAAM;",
  "names": []
}

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