"core-js/modules/es.object.set-prototype-of.js". This file can not be found, please check it for typos or update it if the file got moved.

[shakaran]

I am having this errors, not sure how to fix this:

$encore dev watch
Running webpack ...

 ERROR  Failed to compile with 12 errors                                                                                                                

Module build failed: Module not found:
"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.object.set-prototype-of.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.object.get-prototype-of.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.reflect.construct.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.object.create.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.object.define-property.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.symbol.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.symbol.description.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.object.to-string.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.symbol.iterator.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.array.iterator.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/es.string.iterator.js".
This file can not be found, please check it for typos or update it if the file got moved.

"./node_modules/@symfony/stimulus-bridge/lazy-controller-loader.js!./assets/controllers/hello_controller.js" contains a reference to the file "core-js/modules/web.dom-collections.iterator.js".
This file can not be found, please check it for typos or update it if the file got moved.

I only have the file:

assets/controllers/hello_controller.js

import { Controller } from 'stimulus';

/*
 * This is an example Stimulus controller!
 *
 * Any element with a data-controller="hello" attribute will cause
 * this controller to be executed. The name "hello" comes from the filename:
 * hello_controller.js -> "hello"
 *
 * Delete this file or adapt it for your use!
 */
export default class extends Controller {
    connect() {
        this.element.textContent = 'Hello Stimulus! Edit me in assets/controllers/hello_controller.js';
    }
}

I have to comment all the export default for solve the encore problems.

[Kocal]

Hi, you need to install core-js dependency.

[weaverryan]

Installing core-js should fix it, but I'm confused how this is happening to people. I believe that what causes this is the combination of (A) no core-js install and (B) enabling useBuiltIns: 'usage' for Babel - https://github.com/symfony/recipes/blob/a624d3bf1def68bbd2d542b3a99216c0af090552/symfony/webpack-encore-bundle/1.9/webpack.config.js#L54

You should get both of these things automatically with the WebpackEncoreBundle recipe. It seems like some people are getting the webpack.config.js code (part B) but not part A.... but I don't know how.

[MichaelMackus]

I was having this issue (as well as a bunch of other issues installing webpack encore in a Symfony app recently updated to 4.4). I was following the instructions here: https://symfony.com/doc/current/frontend/encore/installation.html

[Cartman34]

I am having this issue on a Sf 6.1 with Webpack Encore, even after I installed core-js.
In the package.json file, I got
"core-js": "^3.23.2",
But this is still failing to build when using something like Object.entries()
I would mention that I am using controllers from a local bundle and I have some trouble with Flex that is not auto-reciping the bundle.
Last week, this was working, I don't what's changed.

[weaverryan]

@Cartman34 I've tried to offer some help about the package over on symfony/webpack-encore#1129 - my guess is that the error is related to working on a package. Specifically, you may not be "building" a dist version of your JS files in your bundle, and then because they live in node_modules of your app, the files are not being handled by babel in the normal way (as webpack/babel typically expects files in node_modules to already be in a built form).

[Cartman34]

@weaverryan You are totally right, I am a JS developer but not a Node one :D
I understand ressources from package will compiled for publishing but to work locally, it supposed I run one npm run watch per bundle/package, is this the answer ?

I don't even know I was using babel, webpack uses it implicitly ?
So, core-js is ok for project but there is a different compilation scope for each package ?

How do you to develop locally a JS package ?

[pacoVela]

Installing core-js should fix it, but I'm confused how this is happening to people. I believe that what causes this is the combination of (A) no core-js install and (B) enabling useBuiltIns: 'usage' for Babel - https://github.com/symfony/recipes/blob/a624d3bf1def68bbd2d542b3a99216c0af090552/symfony/webpack-encore-bundle/1.9/webpack.config.js#L54

You should get both of these things automatically with the WebpackEncoreBundle recipe. It seems like some people are getting the webpack.config.js code (part B) but not part A.... but I don't know how.

Same error here. I've installed it a dozen times with no issue... but this time npm install fails because the package.json file is not merged with an existing one.
In my case, the package.json only contains:

{
  "devDependencies": {
    "bootstrap": "^5.2.1"
  }
}

;) wanting to get hands on the frontend too early this time?

So, just copy the contents from package.json and run npm install again...

hope it helps!