Javascript systemJS Error Cannot find module - javascript

I have a little not project where I have installed systemJS.
Here is package.json:
{
"name": "mytest",
"version": "0.1.0",
"private": true,
"dependencies": {
"react": "^15.5.4",
"react-dom": "^15.5.4",
"systemjs": "^0.20.13"
},
"devDependencies": {
"react-scripts": "1.0.7"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
}
In app.js I have done this:
import React, { Component } from 'react';
import './App.css';
var SystemJS = require('systemjs');
When I run the project it's giving me this error:
Error: Cannot find module "."
I'm following the instructions here:
https://github.com/systemjs/systemjs
This part:
var SystemJS = require('systemjs');
// loads './app.js' from the current directory
SystemJS.import('./app.js').then(function (m) {
console.log(m);
});
What I'm I doing wrong?

Your problems could be due to the fact that you have missed to configure systemjs - that is instruct it where to look for modules to load.
For example the configuration can look something like this:
System.config({
baseURL: './lib',
// Set paths your modules
paths: {
'angular': 'mode_modules/angular/angular.js',
'angular-route': 'node_modules/angular-route/angular-route.js'
}
});
If you would like to skip the tedious configuration part - you might want to look at JSMP - it takes care of configuration part automatically.

Related

Jest Setup with Next.js fails after it seems to add a react import to index.test.js

Hi I have been stewing over this for the last couple of days. I realise this is a common error with various solutions.
I have the dreaded:
Jest encountered an unexpected token
/__tests__/index.test.js:16
import React from "react";
^^^^^^
SyntaxError: Cannot use import statement outside a module
at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1796:14)
I have read a few posts and the docs in next and jest.
package.json:
{
"name": "some-app",
"version": "0.1.0",
"private": true,
"scripts": {
"dev": "next dev",
"build": "next build",
"start": "next start",
"lint": "next lint",
"test": "jest --watch"
},
"dependencies": {
"next": "12.1.6",
"react": "18.1.0",
"react-dom": "18.1.0"
},
"devDependencies": {
"#babel/plugin-syntax-jsx": "^7.17.12",
"#babel/preset-env": "^7.18.2",
"#babel/preset-react": "^7.17.12",
"#testing-library/jest-dom": "^5.16.4",
"#testing-library/react": "^13.3.0",
"#types/jest": "^28.1.3",
"#types/node-fetch": "^2.6.2",
"babel-jest": "^28.1.1",
"eslint": "8.16.0",
"eslint-config-next": "12.1.6",
"identity-obj-proxy": "^3.0.0",
"jest": "^28.1.1",
"jest-environment-jsdom": "^28.1.1",
"node-fetch": "^3.2.6",
"ts-jest": "^28.0.5",
"typescript": "^4.7.4"
},
"description": "This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).",
"main": "jest.config.js",
"repository": {
"type": "git",
},
"author": "",
"license": "ISC",
"bugs": {
},
}
index.test.js:
import { render, screen } from '#testing-library/react'
import Home from '../pages/index'
import '#testing-library/jest-dom'
import React from "react";
describe('Home', () => {
it('renders a h', () => {
render(<Home />)
const link = screen.getByRole('link', {
name: "Library",
})
expect(link).toHaveAttribute('href', '/storage-area')
})
});
jest.config.js:
module.exports = {
collectCoverage: true,
// on node 14.x coverage provider v8 offers good speed and more or less good report
coverageProvider: 'v8',
collectCoverageFrom: [
'**/*.{js,jsx,ts,tsx}',
'!**/*.d.ts',
'!**/node_modules/**',
'!<rootDir>/out/**',
'!<rootDir>/.next/**',
'!<rootDir>/*.config.js',
'!<rootDir>/coverage/**',
],
moduleNameMapper: {
// Handle CSS imports (with CSS modules)
// https://jestjs.io/docs/webpack#mocking-css-modules
'^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
// Handle CSS imports (without CSS modules)
'^.+\\.(css|sass|scss)$': '<rootDir>/__mocks__/styleMock.js',
// Handle image imports
// https://jestjs.io/docs/webpack#handling-static-assets
'^.+\\.(png|jpg|jpeg|gif|webp|avif|ico|bmp|svg)$/i': `<rootDir>/__mocks__/fileMock.js`,
// Handle module aliases
'^#/components/(.*)$': '<rootDir>/components/$1',
},
// Add more setup options before each test is run
setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/.next/'],
testEnvironment: 'jsdom',
transform: {
// Use babel-jest to transpile tests with the next/babel preset
// https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object
'^.+\\.(js|jsx|ts|tsx)$': ['babel-jest', { presets: ['next/babel', '#babel/preset-react',"#babel/preset-env" ]}],
},
transformIgnorePatterns: [
'/node_modules/',
'^.+\\.module\\.(css|sass|scss)$',
],
}
As I mentioned in the title the it seems that the error message suggests that the import is added by Next.js to the end of the index.test.js.
This was a problem due to the tests folder being nested in the directory above the root directory of the project. By the time I figured this out I had manipulated the jest.config.js transform: presets array property to contain imports that it didn't require in the standard jest/next setup.

Electron - Typescript - Cannot find module

Trying to build my electron app with typescript generated from the electron-quick-start-typescript project. I have added an additional module called auth.ts which is not recognised when I start the app. I am trying to reference it in renderer.ts with
import { myfunction } from './auth'
However I can see that it is getting converted into js. What could be causing this issue? Why can't my application see my new module?
Additionally here is my package.json file if that helps.
{
"name": "electron-quick-start-typescript",
"version": "1.0.0",
"description": "A minimal Electron application written with Typescript",
"scripts": {
"build": "tsc",
"watch": "tsc -w",
"lint": "eslint -c .eslintrc --ext .ts ./src",
"start": "npm run build && electron ./dist/main.js"
},
"repository": "https://github.com/electron/electron-quick-start-typescript",
"keywords": [
"Electron",
"quick",
"start",
"tutorial",
"demo",
"typescript"
],
"author": "GitHub",
"license": "CC0-1.0",
"devDependencies": {
"#typescript-eslint/eslint-plugin": "^4.33.0",
"#typescript-eslint/parser": "^4.33.0",
"electron": "^16.0.2",
"eslint": "^7.32.0",
"typescript": "^4.5.2"
},
"dependencies": {
"node-fetch": "^2.6.1"
}
}
Found the answer. For anyone else having the same issue this resolved the issue -
Make sure nodeIntegration is enabled in main.js
webPreferences: {
nodeIntegration: true,
preload: path.join(__dirname, "preload.js"),
},
Index.html
replace:
<script src="./dist/renderer.js"></script>
with:
<script>
require("./dist/renderer.js");
</script>

Webpack is not loading Css, Images and font

I am trying to load the Css, Images and fonts using the webpack. Here is my webpack.config.js
const path = require('path');
module.exports = {
entry: './src/index.js',
mode: 'development',
output: {
filename: "main.js",
path: path.resolve(__dirname,"dist")
},
module:{
rules:[
{
test: /\.css$/i,
use: ['style-loader', 'css-loader'],
},
{
test: /\.(png|svg|jpg|jpeg|gif)$/i,
type: "asset/resource",
},
{
test: /\.(woff|woff2|eot|ttf|otf)$/i,
type: "asset/resource",
},
],
},
};
This is my package.json
{
"name": "restaurant-page",
"version": "1.0.0",
"description": "",
"private": true,
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"watch": "webpack --watch",
"build": "webpack"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"css-loader": "^6.2.0",
"style-loader": "^3.2.1",
"webpack": "^5.51.1",
"webpack-cli": "^4.8.0"
},
"dependencies": {}
}
This is my index.js. When I uncomment the ./styles.css import I get the
main.js:290 Uncaught Error: Automatic publicPath is not supported in this browser in chrome console and my js imports doesn't work but it dosen't throw me error while building project when I run npm run build commmand in terminal. I tried using css import in each js module-- in home.js etc--file but that also doesn't work.
// import './style.css';
import { homeContent, removeIntroContent } from './Modules/home.js';
import { aboutContent, removeAboutContent } from './Modules/about.js';
import { reviewsContent, removeReviewContent } from './Modules/reviews.js';
const home = document.getElementById("home-btn");
const review = document.getElementById("review-btn");
const about = document.getElementById("about-btn");
homeContent();
home.addEventListener("click",()=>{
removeReviewContent();
removeAboutContent();
const id = document.getElementById("intro-content");
if(id != null) return;
homeContent();
});
review.addEventListener("click",()=>{
removeAboutContent();
removeIntroContent();
const id = document.getElementById("reviews");
if(id != null) return;
reviewsContent();
});
about.addEventListener("click",()=>{
removeReviewContent();
removeIntroContent();
const id = document.getElementById("about");
if(id != null) return;
aboutContent()
});
I have pushed the code to github if anyone want to look at file structure
Here is the link
ps: If I use the link tag to add css to html it works exactly as I want it to but that defeats the purpose of using webpack
I am having trouble with Webpack as well and I came across your question. I don't have a sure solution to your problem, but I hope to steer you in the right direction.
At first glance, I am wondering if editing your package.json file to use your webpack-config when you run 'npm run build' instead of the default webpack config. This could help activate the loaders you are trying to use, or atleast populate error messages that would allow you to investigate further. Editing your package.json would look like:
"scripts": {
"test": "echo \\\"Error: no test specified\\\" && exit 1",
"watch": "webpack --watch",
"build": "webpack --config ./webpack-config.js"
}
Your dependencies make sense and your file path for style.css seems correct, so I am wondering if Webpack does not know how to load your styles, fonts, images without your config file.
Can read more about Webpack configuration here.
https://webpack.js.org/configuration/
Hope I was able to help, good luck! If you have any further questions I'd be happy to help, as I'm learning Webpack too.

React app with express server shows just blanc page

I have one page react app without routing. It works fine. Now I'm trying to host it on heroku, that's why I addded express server. I run server with 'node server/server.js', and after that i was trying to vizit http://localhost:3000 I see just blanc page without errors. I tryed to run app on heroku, but got the same result.
In page code I see just div "root" and it is empty, but inside should be rendered div "app".
My server
const path = require('path');
const express = require('express');
const app = express();
const publicPath = path.join(__dirname, '../', 'public');
const port = process.env.PORT || 3000;
app.use(express.static(publicPath));
app.get('*', (req, res) => {
res.sendFile(path.join(publicPath, 'index.html'));
});
app.listen(port, () => {
console.log('Server is up!');
});
my package.json
{
"name": "my-app",
"version": "0.1.0",
"private": true,
"homepage": "https://reaweapp.herokuapp.com/",
"dependencies": {
"#material-ui/core": "^4.11.0",
"#material-ui/lab": "^4.0.0-alpha.56",
"#material/textfield": "^5.1.0",
"#testing-library/jest-dom": "^4.2.4",
"#testing-library/react": "^9.5.0",
"#testing-library/user-event": "^7.2.1",
"express": "^4.17.1",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "3.4.1"
},
"scripts": {
"start": "node server/server.js",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject",
"predeploy": "npm run build",
"deploy": "gh-pages -d build"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"gh-pages": "^3.1.0"
}
}
my index.js
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
ReactDOM.render(<App />, document.getElementById('root'));
serviceWorker.register();
I think you have 1 extra dot in "../" and would need to path to the build instead:
const publicPath = path.join(__dirname, './','build');
An alternative to doing it yourself would be to use the serve package
npm i serve --save
and change scripts in package.json to
"scripts": {
"dev": "react-scripts start",
"start": "serve -s build",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject",
"heroku-postbuild": "npm run build"
},

Electron react build not launching

I'm having some issues while trying to glue together this two things.
Let me give you some context: I'm trying to build a desktop application based on a web application that I've developed in react and it's fully operative and the build process of react is done without any errors nor issues. The problem comes when I try to glue Electron + a React Built Project.
I'm having the following structure:
/ dist
/ node_modules
/ react-mobx-router
/ build
/ static
/ js
main.05ef4655.js
/ css
main.9d8efafe.css
index.html
index.js
At the index.js i have the following code that's basically the sample boilerplate code from electron demo app:
'use strict';
const electron = require('electron');
const app = electron.app;
// adds debug features like hotkeys for triggering dev tools and reload
require('electron-debug')();
// prevent window being garbage collected
let mainWindow;
function onClosed() {
// dereference the window
// for multiple windows store them in an array
mainWindow = null;
}
function createMainWindow() {
const win = new electron.BrowserWindow({
width: 1280,
height: 720,
minWidth: 1280,
minHeight: 720
});
win.loadURL(`file://${__dirname}/react-mobx-router/build/index.html`);
//win.loadURL(`http://localhost:3000`);
win.on('closed', onClosed);
return win;
}
app.on('window-all-closed', () => {
if (process.platform !== 'darwin') {
app.quit();
}
});
app.on('activate', () => {
if (!mainWindow) {
mainWindow = createMainWindow();
}
});
app.on('ready', () => {
mainWindow = createMainWindow();
});
I also have to manually change some paths at the react built index.html so it will look like:
<link href="./static/css/main.9d8efafe.css" rel="stylesheet">
instead of:
<link href="/static/css/main.9d8efafe.css" rel="stylesheet">
The second one get's the following errors:
file:///D:/static/css/main.9d8efafe.css Failed to load resource: net::ERR_FILE_NOT_FOUND
main.05ef4655.js Failed to load resource: net::ERR_FILE_NOT_FOUND
The point is that, when I launch the Electron app with yarn start (changing the paths I've told you previously) it launches without any error nor issue but only a blank screen, if I go to the files and look for them, they are correct and the code is inside, bundled and all that react-create-app stuff does.
This is the default configuration of the package.json that comes with Electron and I haven't modified:
{
"name": "app",
"productName": "App",
"version": "0.0.0",
"description": "",
"license": "MIT",
"repository": "user/repo",
"author": {
"name": "",
"email": "",
"url": ""
},
"scripts": {
"test": "xo",
"start": "electron .",
"build": "electron-packager . --out=dist --asar --overwrite --all"
},
"files": [
"index.js",
"index.html",
"index.css"
],
"keywords": [
"electron-app",
"electron"
],
"dependencies": {
"electron-debug": "^1.0.0"
},
"devDependencies": {
"devtron": "^1.1.0",
"electron-packager": "^8.0.0",
"electron": "^1.0.1",
"xo": "^0.16.0"
},
"xo": {
"esnext": true,
"envs": [
"node",
"browser"
]
}
}
Also this is the package.json of my React Project:
{
"name": "react-mobx",
"version": "0.1.0",
"private": true,
"devDependencies": {
"custom-react-scripts": "0.0.23",
"mobx-react-devtools": "^4.2.11"
},
"dependencies": {
"mobx": "^3.1.4",
"mobx-react": "^4.1.2",
"mobx-react-router": "latest",
"react": "^15.4.2",
"react-dom": "^15.4.2",
"react-router": "latest"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
}
Note that the React App is fully functional if I don't make use of Electron.
That's why I ask for your wisdom, mates. I need some light here so I can keep moving on with this project. Hope you can help me with this issue and I've provided you with enough information. If you need more info, just let me know.
Warm regards,
Alex.
I'm no React hero (by a long chalk) but I am able to run, hot reload and release build using the schema set out by this boilerplate: electron-es6-react. I added some conditional code to main.js (below) for builds. There are no doubt much better solutions.
You definitely need to merge your React package.json with Electron's.
var isDev = process.env.APP_DEV ? (process.env.APP_DEV.trim() == "true") : false;
if (isDev) {
// only add this during development
require('electron-reload')(__dirname, {
electron: path.join(__dirname, 'node_modules', '.bin', 'electron')
});
}
package.json
{
"name": "electron-es6-react",
"version": "0.1.0",
"description": "template",
"license": "MIT",
"production": false,
"version-string": {
"CompanyName": "Cool Co.",
"FileDescription": "template",
"OriginalFilename": "template",
"ProductName": "template",
"InternalName": "template"
},
"main": "main.js",
"scripts": {
"start": "APP_DEV=true electron -r babel-register .",
"package-mac": "electron-packager . --overwrite --tmpdir=false --platform=darwin --arch=x64 --prune=true --out=release-builds",
"package-win": "electron-packager . --overwrite --tmpdir=false --asar=true --platform=win32 --arch=ia32 --prune=true --out=release-builds"
},
"dependencies": {
"babel-preset-es2015": "^6.3.13",
"babel-preset-react": "^6.3.13",
"babel-register": "^6.3.13",
"fs-jetpack": "^0.12.0",
"react": "^15.3.2",
"react-dom": "^15.3.2",
"react-images": "^0.5.2"
},
"devDependencies": {
"electron": "^1.4.3",
"electron-packager": "^8.5.2",
"electron-reload": "^1.1.0"
}
}

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