I am setting up a next and expo project in a monorepo with yarn workspaces. I always get the following error when trying to run a page with a component exported from another yarn workspace package:
You may need an appropriate loader to handle this file type, currently no loaders
are configured to process this file. See https://webpack.js.org/concepts#loaders
| export const ExampleButton = () => (
> <TouchableOpacity>
| <Text>Press to test</Text>
| </TouchableOpacity>
When importing the same component from a file inside the app, it works. It only brakes when importing from another yarn workspace package. Are there any high level reasons why this would happen? I'm happy to provide more info if required.
Related
I am trying to include tests in my App created with Expo, but I am facing errors with AsyncStorage module
Could not find module '#react-native-async-storage/async-storage' from 'src/pages/Welcome.tsx'
I tested some configurations of the jest/expo to avoid this error, as downgrade the jest to version 26 as suggested in a GitHub issue of the project, using a mock directory as suggested here and in the official documentation here, and using jest setup file. Details below.
When I try with mock directory nothing changes in the error. The execution ignores the mock directory. When using the jest setup file the only change in the error message is that the message point to the jest setup file instead of the welcome.tsx.
The page tested is the "Welcome.tsx" that import the AsyncStorage
The test has nothing, only a a console log (code below) and don't use the AsyncStorage
The test code
const {getAllByTestId} = renderer.create(<Welcome />);
console.log(getAllByTestId);
The Welcome.tsx
...
<Image source=... testID="WelcomeImage" />
...
package.json
...
"scripts": { ... "test": "jest" ...},
"jest:" {
"preset": "jest-expo",
"globals": { "DEV": true
}
...
Installed versions
React: 17.0.1
React native: 0.64.3
React native testing library: 6.0.0
React test renderer: 17
Jest: 27.4.5
Follow the directions at - https://react-native-async-storage.github.io/async-storage/docs/advanced/jest/
Here is what I did:
Setup jestSetupFile.js as mentioned.
Setup mocks/#react-native-async-storage directory as mentioned
(I know it mentions to use either of two but I did both)
Cleared npm cache, deleted node-modules folder, deleted package-lock.json and did npm i again.(The usual steps to a clean start)
And it works now. Although I get error for enzyme but that is not within the scope of this question.
Dear Stack Overflow / Vue.js / Rollup community
This could be a noob question for the master plugin developers working with Vue and Rollup. I will write the question very explicitly hoping that it could help other noobs like me in the future.
I have simple plugin that helps with form validation. One of the components in this plugin imports Vue in order to programatically create a component and append to DOM on mount like below:
import Vue from 'vue'
import Notification from './Notification.vue' /* a very simple Vue component */
...
mounted() {
const NotificationClass = Vue.extend(Notification)
const notificationInstance = new NotificationClass({ propsData: { name: 'ABC' } })
notificationInstance.$mount('#something')
}
This works as expected, and this plugin is bundled using Rollup with a config like this:
import vue from 'rollup-plugin-vue'
import babel from 'rollup-plugin-babel'
import { terser } from 'rollup-plugin-terser'
import resolve from 'rollup-plugin-node-resolve'
import commonjs from 'rollup-plugin-commonjs'
export default {
input: 'src/index.js',
output: {
name: 'forms',
globals: {
vue: 'Vue'
}
},
plugins: [
vue(),
babel(),
resolve(),
commonjs(),
terser()
],
external: ['vue']
}
As you can see, Vue.js is getting externalised in this bundle. The aim (and the assumption) is that the client app that imports this plugin will be running on Vue, therefore there's no need to bundle it here (assumption).
The very simple src/index.js that the bundler uses is below:
import Form from './Form.vue'
export default {
install(Vue, _) {
Vue.component('bs-form', Form)
}
}
Rollup creates 2 files (one esm and one umd) and references them in in the plugins package.json file like below:
"name": "bs-forms",
"main": "./dist/umd.js",
"module": "./dist/esm.js",
"files": [
"dist/*"
],
"scripts": {
"build": "npm run build:umd & npm run build:es",
"build:es": "rollup --config rollup.config.js --format es --file dist/esm.js",
"build:umd": "rollup --config rollup.config.js --format umd --file dist/umd.js"
}
Everything works as expected up to this point and the bundles are generated nicely.
The client app (Nuxt SSR) imports this plugin (using npm-link since it's in development) with a very simple import in a plugin file:
/* main.js*/
import Vue from 'vue'
import bsForms from 'bs-forms'
Vue.use(bsForms)
This plugin file (main.js) is added to nuxt.config.js as a plugin:
// Nuxt Plugins
...
plugins: [{src: '~/plugins/main'}]
...
Everything still works as expected but here comes the problem:
Since the clients is a Nuxt app, the Vue is imported by default of course but the externalised Vue module (by the forms plugin) is also imported in the client. Therefore there is a duplication of this package in the client bundle.
I guess the client app can configure its webpack config in order to remove this duplicated module. Perhaps by using something like a Dedupe plugin or something? Can someone suggests how to best handle situation like these?
But what I really want to learn, is the best practice of bundling the plugin at the first place, so that the client doesn't have to change anything in its config and simply imports this plugin and move on.
I know that importing the Vue.js in the plugin may not be a great thing to do at the first place. But there could be other reasons for an import like this as well, for example imagine that the plugin could be written in Typescript and Vue.js / Typescript is written by using Vue.extend statements (see below) which also imports Vue (in order to enable type interface):
import Vue from 'vue'
const Component = Vue.extend({
// type inference enabled
})
So here's the long question. Please masters of Rollup, help me and the community out by suggesting best practice approaches (or your approaches) to handle situations like these.
Thank you!!!!
I had the same problem and I found this answer of #vatson very helpful
Your problem is the combination of "npm link", the nature of nodejs module loading and the vue intolerance to multiple instances from different places.
Short introduction how import in nodejs works. If your script has some kind of library import, then nodejs initially looks in the local node_modules folder, if local node_modules doesn't contain required dependency then nodejs goes to the folder above to find node_modules and your imported dependency there.
You do not need to publish your package on NPM. It is enough if you generate your package locally using npm pack and then install it in your other project npm install /absolute_path_to_your_local_package/your_package_name.tgz. If you update something in your package, you can reinstall it in your other project and everything should work.
Here is the source about the difference between npm pack and npm link https://stackoverflow.com/a/50689049/6072503.
I have sorted this problem with an interesting caveat:
The duplicate Vue package doesn't get imported when the plugin is used via an NPM package (installed by npm install -save <plugin-name> )
However, during development, if you use the package vie npm link (like npm link <plugin-name>) then Vue gets imported twice, like shown in that image in the original question.
People who encounter similar problems in the future, please try to publish and import your package and see if it makes any difference.
Thank you!
I'm working on a project where I use electron-vue and to make the app look better I use bootstrap-vue. After a lot of debugging, I have found that changing a data property(in the parent component) that is linked to bootstrap components props. It will give me error messages telling me not to mutate props values, and that they are read-only. As it seems for me, the code works and executes, but will give me a lot of errors in the console. When I say it seems to work, what I mean is that both console.log and visually on bootstrap component it seems to change the variables correctly.
After writing a lot of test cases I have found out that changing a data property does not give an error. But when changing a data property that is linked to a bootstrap component prop it will.
A test case that shows where these error messages show up is in the code below:
<template>
<b-progress :max="maxNumberOfFiles" show-value>
<b-progress-bar :value="currentNumberOfErrorFiles"
:max="maxNumberOfFiles"
variant="danger"
show-value
/>
</b-progress>
</template>
export default {
data() {
maxNumberOfFiles: 1,
currentNumberOfErrorFiles: 0
},
methods {
test: function() {
currentNumberOfErrorFiles = 1;
}
}
}
The code above will result in 3 errors:
$attrs is readonly
$listeners is readonly
Avoid mutating a prop directly since the value will be overwritten whenever
the parent component re-renders. Instead, use a data or computed property
based on the prop's value. Prop being mutated: "value"
But this code produces zero errors:
<template>
<progress :value="currentNumberOfErrorFiles"
:max="maxNumberOfFiles"
>
</progress>
</template>
export default {
data() {
maxNumberOfFiles: 1,
currentNumberOfErrorFiles: 0
},
methods {
test: function() {
currentNumberOfErrorFiles = 1;
}
}
}
I have tried to use google for similar problems and look at the doc for both electron-vue and bootstrap-vue, and can't find anything that helped me. Is there anyone that have run into the same problem or have a solution on how to get rid of those errors?
So after a lot of headaches, I finally found a way to avoid all these warnings and errors. When I initialized the project I used these commands:
$ npm install vue-cli -g
$ vue init simulatedgreg/electron-vue <<project-name>>
After a suggestion on reinitializing the project using the vue-cli and add the plugin for electron after (This person created a quick project and had no problems). So when initializing the project again I used these commands:
npm install vue-clie -g
vue create <<project-name>>
cd <<project-name>>
vue add electron-builder
npm install bootstrap-vue
npm install
If I remeber correctly those were all the npm install commands you needed, but if you get an error of a package missing, just use npm install <> to install it.
Now I had to move every .vue file over to the new project and check that all the import statements are correct, and import and use bootstrap again in the index.js.
If you use vue-router, vuex or vuex-electron these also need to be moved over and installed again. This should just be to move the files over to the new project and check where they were imported in the old files and copy that over.
For me, it seemed that the vue init command did something that the bootstrap-vue package doesn't like. I didn't have a very large project, so the whole process took about 15-20 min.
To run an auto update dev server use the command npm run electron:serve and the command npm run electron:build to build the project. These commands can be changed in the package.json file.
The folder structure is a bit different, there will no longer be a renderer and main folder. Everything will be in the src folder. The main.js from the main folder is now named background.js. Apart from that, I think it is similar enough to figure out by just looking through the files.
I'm trying to use Snap.svg in my Vue.js app, however I'm confuse with how to do so.
I used Vue CLI 3 command to initialized my project, and install the snapsvg dependency with yarn.
Also, I read this article.
But I can't find the webpack.base.conf.js file !
When I try to import the dependency into my main.js file or into any component I've got no error but my App become empty.
What did I miss to properly import Snap.svg in my Vue.js app ?
Instead of hacking webpack,
use snapsvg-cjs
This project simply unwraps the excellent SnapSVG from its published AMD format and hosts it on NPM as CommonJS in a package called snapsvg-cjs. This package then works out-of-the-box with Webpack, without needing any import-loader hax.
npm install snapsvg-cjs;
the only line of code you'll need:
import "snapsvg-cjs";
In Vue cli 3, webpack is configured in vue.config.js
To use snap place the vue.config.js with the following content in your root directory
module.exports = {
chainWebpack: config => {
config.module
.rule("snapsvg")
.test(require.resolve("snapsvg"))
.use("imports-loader?this=>window,fix=>module.exports=0")
.loader("imports-loader")
.end();
}
};
add this line to your main.js file:
const snap = require(`imports-loader?this=>window,fix=>module.exports=0!snapsvg/dist/snap.svg.js`);
I set up an Aurelia project using the minimal project given here.
Then I added the fetch-client using npm install aurelia-fetch-client --save command. It updated package.json to contain following:
"dependencies": {
"aurelia-fetch-client": "^1.1.0"
}
But when I added import {HttpClient} from 'aurelia-fetch-client'; to my app.js file and tried running the app, but got following error:
system.js:4 GET http://localhost:5000/aurelia-fetch-client 404 (Not Found)
How do I add that? Where does this project keep track of its dependencies? I have seen lots of tutorials which help setting up the fetch client in aurelia cli projects. How about the project given here?
First, follow Fabio Luz's advice above and actually install either aurelia-cli or a skeleton framework.
Then, I have found this next step to be one of the most common sources of confusion for most people who are learning Aurelia. After installing new modules via npm, you have to manually list them as a dependency in aurelia.json (in your aurelia_project folder). For example, you would list aurelia-fetch-client as follows:
"dependencies": [
"aurelia-binding",
"aurelia-bootstrapper",
"aurelia-dependency-injection",
"aurelia-event-aggregator",
...
"aurelia-fetch-client",
...
After it is listed as a dependency, it will be included in the vendor.js bundle (in the CLI, by running au run --watch) so that it can be accessed by your application when you import it in individual components.
import {HttpClient} from 'aurelia-fetch-client';
For me it worked like this (using the project generated by the CLI):
npm i whatwg-fetch --save
npm i aurelia-fetch-client --save
add "aurelia-fetch-client" to dependencies in aurelia_project/aurelia.json
example of app.js:
import {HttpClient} from 'aurelia-fetch-client';
let client = new HttpClient();
export class App{
activate(){
client.fetch('http://...json');
.then(response => response.json())
.then(data =>{
console.log(data)
});
}
}
You can also install dependencies with the CLI itself.
It doesn't always get it 100% correct but can point you in the right direction if struggling.
For example au install aurelia-fetch-client
It will download the dependency, add to packages.json and attempt to create an entry for the bundling.