Develop Reference

Jest - ReferenceError: __DEV__ is not defined (React Native)

I am trying to get jest to work with a new react-native project. However, when I run npm run test, I get the following error ReferenceError: __DEV__ is not defined. I've looked through countless Github issues and Stack Overflow posts regarding this but none of the suggestions have worked in my case.
Here is my jest.config.js file:
module.exports = {
transformIgnorePatterns: [
"node_modules/(?!(react-native|react-native-button|react-native-video)/)"
],
setupFiles: ['<rootDir>/__tests__/setup.json'],
}
package.json (notice I added DEV = true inside "jest")
{
"name": "DigitalSignagePlayer",
"version": "0.0.1",
"private": true,
"scripts": {
"android": "react-native run-android",
"ios": "react-native run-ios",
"start": "react-native start",
"test": "jest",
"lint": "eslint ."
},
"dependencies": {
"#react-native-async-storage/async-storage": "^1.15.5",
"axios": "^0.21.1",
"react": "^17.0.1",
"react-native": "0.64.2",
"react-native-fs": "^2.18.0",
"react-native-splash-screen": "^3.2.0",
"react-native-video": "^5.1.1"
},
"devDependencies": {
"#babel/core": "^7.14.5",
"#babel/preset-env": "^7.14.7",
"#babel/runtime": "^7.14.5",
"#react-native-community/eslint-config": "^2.0.0",
"babel-jest": "^27.0.2",
"eslint": "^7.28.0",
"jest": "^27.0.5",
"metro-react-native-babel-preset": "^0.66.0",
"react-test-renderer": "17.0.1"
},
"jest": {
"preset": "react-native",
}
}
bable.config.js
module.exports = {
presets: ['module:metro-react-native-babel-preset', '#babel/preset-env'],
};
metro.config.js
/**
* Metro configuration for React Native
* https://github.com/facebook/react-native
*
* #format
*/
module.exports = {
transformer: {
getTransformOptions: async () => ({
transform: {
experimentalImportSupport: false,
inlineRequires: true,
},
}),
},
};
I have tried setting globals.DEV = true and global.DEV = true at the top of my test files. I have tried adding setupFiles to jest.config.js which loads a setup.js file that contains global.DEV = true too. I have tried updating jest also. My current version of react-native is:
react-native-cli: 2.0.1
react-native: 0.64.2
I'm also using Metro, not Expo and I initially created the app with react-native-cli.
UPDATE:
setup.json
{
"globals": { "__DEV__": true }
}
UPDATE 2:
I changed setup.json to setup.js but I am still getting the same error:
global.__DEV__ = true

The variable is called __DEV__, so using DEV by trial and error doesn't make sense. Setting it in tests won't help because it won't affect the usage of the variable on import. In order to do this, this should have been done before tests in setupFiles* files.
Jes globals configuration option is supposed to do this. There should be "globals": { "__DEV__": true }. The configuration in package.json overridden by the configuration in jest.config.js. There should be only one of them (likely the latter), the other one needs to be removed.

How to add Sapper to existing Svelte project?

I have extensive applications in svelte, later I need to attach a sapper to it for further work, it is possibly? I try do it via:
npm i #sapper
but when I try to import something from this package e.q.:
import { goto } from '#sapper/app';
compiler throw me that i have no dependency to this sapper methods :(
I have no idea how to attach sapper to my project
my rollup
import svelte from "rollup-plugin-svelte";
import resolve from "#rollup/plugin-node-resolve";
import commonjs from "#rollup/plugin-commonjs";
import livereload from "rollup-plugin-livereload";
import { terser } from "rollup-plugin-terser";
// library that helps you import in svelte with
// absolute paths, instead of
// import Component from "../../../../components/Component.svelte";
// we will be able to say
// import Component from "components/Component.svelte";
import alias from "#rollup/plugin-alias";
const production = !process.env.ROLLUP_WATCH;
// configure aliases for absolute imports
const aliases = alias({
resolve: [".svelte", ".js"], //optional, by default this will just look for .js files or folders
entries: [
{ find: "components", replacement: "src/components" },
{ find: "views", replacement: "src/views" },
{ find: "assets", replacement: "src/assets" },
],
});
function serve() {
let server;
function toExit() {
if (server) server.kill(0);
}
return {
writeBundle() {
if (server) return;
server = require("child_process").spawn(
"npm",
["run", "start", "--", "--dev"],
{
stdio: ["ignore", "inherit", "inherit"],
shell: true,
}
);
process.on("SIGTERM", toExit);
process.on("exit", toExit);
},
};
}
export default {
input: "src/main.js",
output: {
sourcemap: true,
format: "iife",
name: "app",
file: "public/build/bundle.js",
},
plugins: [
svelte({
// enable run-time checks when not in production
dev: !production,
// we'll extract any component CSS out into
// a separate file - better for performance
css: (css) => {
css.write("bundle.css");
},
}),
// If you have external dependencies installed from
// npm, you'll most likely need these plugins. In
// some cases you'll need additional configuration -
// consult the documentation for details:
// https://github.com/rollup/plugins/tree/master/packages/commonjs
resolve({
browser: true,
dedupe: ["svelte"],
}),
commonjs(),
// In dev mode, call `npm run start` once
// the bundle has been generated
!production && serve(),
// Watch the `public` directory and refresh the
// browser on changes when not in production
!production && livereload("public"),
// If we're building for production (npm run build
// instead of npm run dev), minify
production && terser(),
// for absolut imports
// i.e., instead of
// import Component from "../../../../components/Component.svelte";
// we will be able to say
// import Component from "components/Component.svelte";
aliases,
],
watch: {
clearScreen: false,
},
};
my package.json:
{
"name": "svelte-app",
"version": "1.0.0",
"scripts": {
"build": "rollup -c",
"dev": "rollup -c -w",
"start": "sirv public -s",
"build:tailwind": "tailwind build public/assets/styles/index.css -o public/assets/styles/tailwind.css",
"build:fontawesome": "mkdir -p public/assets/vendor/#fortawesome/fontawesome-free/webfonts && mkdir -p public/assets/vendor/#fortawesome/fontawesome-free/css && cp -a ./node_modules/#fortawesome/fontawesome-free/webfonts public/assets/vendor/#fortawesome/fontawesome-free/ && cp ./node_modules/#fortawesome/fontawesome-free/css/all.min.css public/assets/vendor/#fortawesome/fontawesome-free/css/all.min.css",
"install:clean": "rm -rf node_modules/ && rm -rf package-lock.json && rm -rf public/build && npm install && npm run build:tailwind && npm run build:fontawesome && npm run dev"
},
"devDependencies": {
"#rollup/plugin-commonjs": "^16.0.0",
"#rollup/plugin-node-resolve": "^10.0.0",
"rollup": "^2.3.4",
"rollup-plugin-commonjs": "^10.1.0",
"rollup-plugin-css-only": "^3.1.0",
"rollup-plugin-livereload": "^2.0.0",
"rollup-plugin-node-polyfills": "^0.2.1",
"rollup-plugin-svelte": "^7.0.0",
"rollup-plugin-terser": "^7.0.0",
"svelte": "^3.0.0",
"webpack": "^5.11.1",
"webpack-cli": "^4.3.1"
},
"dependencies": {
"#fortawesome/fontawesome-free": "5.14.0",
"#popperjs/core": "2.5.1",
"#rollup/plugin-alias": "3.1.1",
"#rollup/plugin-replace": "^2.3.4",
"#tailwindcss/custom-forms": "0.2.1",
"body-parser": "^1.19.0",
"chart.js": "2.9.3",
"compression": "^1.7.4",
"express": "^4.17.1",
"express-session": "^1.17.1",
"fontawesome-svelte": "^2.0.1",
"node-fetch": "^2.6.1",
"node-sass": "^5.0.0",
"page": "^1.11.6",
"polka": "^0.5.2",
"rollup-plugin-scss": "^2.6.1",
"session-file-store": "^1.5.0",
"sirv": "^1.0.10",
"sirv-cli": "1.0.6",
"svelte-routing": "1.4.2",
"tailwindcss": "1.8.10"
}
}

I was looking for this answer, I think the #Romain Durand answer is the closest, I don't think we can add ssaper to an existing svelte project. I would have to initialize project in ssaper and use svelte.

Include extra files inside app.asar using electron

It's a Vue app with electron-builder
{
"scripts": {
"serve": "vue-cli-service serve",
"build": "vue-cli-service build",
"electron:build": "vue-cli-service electron:build",
"electron:serve": "vue-cli-service electron:serve",
"postinstall": "electron-builder install-app-deps",
"postuninstall": "electron-builder install-app-deps",
},
"main": "background.js",
"dependencies": {
"core-js": "^3.6.5",
"vue": "^2.6.11",
"vue-class-component": "^7.2.3",
"vue-property-decorator": "^8.4.2",
"vue-router": "^3.3.2",
"vuetify": "^2.2.33"
},
"devDependencies": {
"#vue/cli-plugin-babel": "~4.4.0",
"#vue/cli-plugin-eslint": "~4.4.0",
"#vue/cli-plugin-router": "~4.4.0",
"#vue/cli-plugin-typescript": "~4.4.0",
"#vue/cli-service": "~4.4.0",
"electron": "^6.1.12",
"typescript": "^3.9.5",
"vue-cli-plugin-electron-builder": "~1.4.6",
"vue-cli-plugin-vuetify": "~2.0.5",
"vue-template-compiler": "^2.6.11",
"vuetify-loader": "^1.3.0"
}
}
When I use npm run electron:build, this structure is generated:
And this is the content of app.asar:
background.js include all the dependencies. There are some external modules (from node_modules) that read files using something like fs.readFile(__dirpath + '/file'). As expected, these files are not included in the generated bundle, so I need to add them.
I've tried to use this in vue.config.js:
module.exports = {
lintOnSave: true,
transpileDependencies: [
'vuetify'
],
configureWebpack: {
devtool: 'source-map'
},
pluginOptions: {
electronBuilder: {
builderOptions: {
extraFiles: [
'node_modules/module/file'
]
}
}
}
}
But the file is included outside the app.asar, even with extraResources, and thus fs.readFile(__dirpath + '/file') did not find the file.
How can I include files inside app.asar?

The only way I found was using the public directory. Any file inside public/ will be copied to app.asar.
However, the file I need to copy belongs to an external lib, so to not make this file part of my project, I gitignored it and copy just before the build, using npm scripts.
"scripts": {
"build": "cp node_modules/lib/file public && vue-cli-service electron:build -wl",
"serve": "mkdir -p dist_electron && cp node_modules/lib/file dist_electron && vue-cli-service electron:serve"
}

I found out the path for files have to be relative path from dist_electron/bundled(or maybe other directory). So if we have directory named keys in root, the config should to be something like bellow.
module.exports = {
pluginOptions: {
electronBuilder: {
nodeIntegration: true,
builderOptions: {
files: [
"**/*",
{
from: "../../keys",
to: "./keys",
filter: ["**/*"],
},
],
},
},
},
};

Ember Quickstart: could not find module `#glimmer/component` when adding JS file to first component

I just started using Ember. I already had some trouble with the Ember Quickstart tutorial which describes that hbs and js files for components should both be put in app/components. The only way it works on my machine is with the js file in app/components, but the hbs file in app/templates/components. That's also what ember generate component people-list did.
Now, there's another problem: The first line in people-list.js is
import Component from '#glimmer/component';
This causes the error Could not find module #glimmer/component imported from ember-quickstart/components/people-list. There is no build error, but the component's content does not render. What can I do about this?
edit 1: In my other question, Ember Octane was mentioned. This is the output of ember -v:
ember-cli: 3.18.0
node: 11.13.0
os: darwin x64
edit 2 Below is my package.json after adding glimmer. I could run npm install, but yarn install gives me The engine "node" is incompatible with this module. Expected version "10.* || >= 12". Got "11.13.0".
{
"name": "ember-quickstart",
"version": "0.0.0",
"private": true,
"description": "Small description for ember-quickstart goes here",
"repository": "",
"license": "MIT",
"author": "",
"directories": {
"doc": "doc",
"test": "tests"
},
"scripts": {
"build": "ember build",
"lint:hbs": "ember-template-lint .",
"lint:js": "eslint .",
"start": "ember serve",
"test": "ember test"
},
"devDependencies": {
"#ember/jquery": "^0.5.2",
"#ember/optional-features": "^0.6.3",
"broccoli-asset-rev": "^2.7.0",
"ember-ajax": "^5.0.0",
"ember-cli-app-version": "^3.2.0",
"ember-cli-babel": "^7.1.2",
"ember-cli-dependency-checker": "^3.1.0",
"ember-cli-eslint": "^4.2.3",
"ember-cli-htmlbars": "^3.0.0",
"ember-cli-htmlbars-inline-precompile": "^1.0.3",
"ember-cli-inject-live-reload": "^1.8.2",
"ember-cli-sri": "^2.1.1",
"ember-cli-template-lint": "^1.0.0-beta.1",
"ember-cli-uglify": "^2.1.0",
"ember-data": "~3.9.0",
"ember-export-application-global": "^2.0.0",
"ember-load-initializers": "^1.1.0",
"ember-maybe-import-regenerator": "^0.1.6",
"ember-qunit": "^3.4.1",
"ember-resolver": "^5.0.1",
"ember-source": "~3.9.0",
"ember-welcome-page": "^3.2.0",
"eslint-plugin-ember": "^5.2.0",
"loader.js": "^4.7.0",
"qunit-dom": "^0.8.0"
},
"engines": {
"node": "10.* || >= 12"
},
"dependencies": {
"ember-cli": "^3.18.0",
"#glimmer/component": "^1.0.0"
}
}
Now the problem described above is gone, instead I get Parsing error: Unexpected character '#' in line 5 of people-list.js:
import Component from '#glimmer/component';
import { action } from '#ember/object';
export default class PeopleListComponent extends Component {
#action
showPerson(person) {
alert(`The person's name is ${person}!`);
}
}

Please ensure that "#glimmer/component": "^1.0.0" line exists in your package.json. Then rerun npm install or yarn install and restart ember s. This should be there if you had used ember new with Ember 3.14+, but it seems like it might be missing.

use LESS in webpack and es6

I'm following a lecture on Angular With Webpack.
I am trying to add the less loader and keep getting an error.
ERROR in ./src/app.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../style.less in D:\projects\dev\webpack-angular-demo/src
# ./src/app.js 3:0-24
My webpack.config.js is :
module.exports = {
context: __dirname + '/src',
entry:'./app.js',
module:{
loaders:[
{
//create working environment for es6 need to npm i babel-loader babel-core babel-preset-es2015 -D
//https://github.com/babel/babel-loader
test:/\.js$/,
exclude:'/node_modules',
loader:'babel',
query: {
presets: ['es2015']
}
},
{
//take less convert to css and inject to style tag need to: npm i css-loader less-loader less style-loader -D
//https://github.com/webpack/less-loader
test:/\.less$/,
exclude:'/node_modules',
loader:"style!css!less"
}
]
}
};
My app.js is:
import '../style.less';
class Log{
constructor(){
console.log("sdfsdf");
}
}
new Log();
Inside the src directory i have the app.js , index.html and style.less files.
finally , this is my package.json file:
{
"name": "webpack-angular-demo",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-core": "^6.10.4",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.9.0",
"css-loader": "^0.23.1",
"less": "^2.7.1",
"less-loader": "^2.2.3",
"style-loader": "^0.13.1",
"webpack": "^1.13.1",
"webpack-dev-server": "^1.14.1"
}
}
any idea why i'm getting this error ?
Thanks

i had the exact same problem like you. i managed to solve that with tiny change.
path.join(__dirname, 'src')
instead of using:
__dirname + '/src/
now, make sure that your webpack.config.js look like:
var path = require('path');
module.exports = {
context: path.join(__dirname, 'src'),
...
and when I import the style.less i used like above
import './style.less';

If all files are in the same directory (src), the first line in app.js should be:
import './style.less';