In my react project I have a root ./styles folder which contains various style objects for styled-components. I do not want these files to show up in the coverage test.
I've tried to hide them like so, but when I run npm run coverage they still show up.
package.json
"jest": {
"setupFilesAfterEnv": [
"<rootDir>/jest.setup.js"
],
"coveragePathIgnorePatterns": [
"<rootDir>/styles/",
"./styles/"
],
"testPathIgnorePatterns": [
"<rootDir>/.next/",
"<rootDir>/node_modules/",
"<rootDir>/styles/",
"./styles/"
],
"transform": {
"^.+\\.(js)$": "babel-jest",
"^.+\\.js?$": "babel-jest",
"^.+\\.ts?$": "babel-jest",
"^.+\\.tsx?$": "babel-jest",
"^.+\\.json5$": "json5-jest"
},
"moduleFileExtensions": [
"js",
"json",
"json5",
"ts",
"tsx"
],
"modulePaths": [
"<rootDir>/components/",
"<rootDir>/pages/",
"<rootDir>/shared/"
]
}
babelrc
{
"env": {
"development": {
"presets": [
"next/babel",
"#zeit/next-typescript/babel"
],
"plugins": [
["styled-components", {"ssr": true, "displayName": true}],
["#babel/plugin-proposal-decorators", {"legacy": true}],
["istanbul",{"exclude": ["styles/*.js"]}]
]
},
"production": {
"presets": [
"next/babel",
"#zeit/next-typescript/babel"
],
"plugins": [
["styled-components", {"ssr": true, "displayName": true}],
["#babel/plugin-proposal-decorators", {"legacy": true}]
]
},
"test": {
"presets": [
"#babel/preset-typescript",
["next/babel", {"preset-env": { "modules": "commonjs" }}]
],
"plugins": [
["styled-components", { "ssr": true, "displayName": true }],
["#babel/plugin-proposal-decorators", { "legacy": true }],
["babel-plugin-sass-vars"]
]
}
}
}
All I needed was this in package.json
"coveragePathIgnorePatterns": [
"<rootDir>/styles/"
],
And removed it from "testPathIgnorePatterns": <- having it both here and in coveragePathIgnorePatterns caused my tests to run forever and styles still showed up.
I also removed this from the .babelrc:
["istanbul",{"exclude": ["styles/*.js"]}]
Add this to your config (package.json):
modulePathIgnorePatterns: ["directoryNameToIgnore"]
or :
modulePathIgnorePatterns: ["/dist/"]
and :
coveragePathIgnorePatterns: ["/styles/"]
Related
my .eslintrc.json file located at ./
{
"env": {
"browser": true,
"es2021": true
},
"extends": [
"eslint:recommended",
"plugin:import/errors",
"plugin:import/warnings"
],
"overrides": [
],
"parserOptions": {
"ecmaVersion": "latest",
"sourceType": "module"
},
"rules": {
},
"settings": {
"import/resolver": {
"alias": {
"root": ["./"],
"map": [
["#", "./src"]
],
"extensions": [".js", ".jsx", ".ts", ".tsx"]
}
}
}
}
My foo.js file located in ./src. As you can see it is not suggesting any files. Why?
I use Material UI and want to make the bundle size smaller by loading the components on demand.
I've got a Babel config in a .babelrc file.
At the moment the .babelrc looks like this:
{
"presets": ["#babel/preset-env", "#babel/react"],
"plugins": [
["#babel/plugin-syntax-dynamic-import"],
["react-hot-loader/babel"],
["import", {
"libraryName": "antd",
"style": true
}],
[
"#babel/plugin-transform-runtime",
{
"regenerator": true
}
]
]
}
Now I need to add the following:
const plugins = [
[
'babel-plugin-import',
{
'libraryName': '#material-ui/core',
// Use "'libraryDirectory': ''," if your bundler does not support ES modules
'libraryDirectory': 'esm',
'camel2DashComponentName': false
},
'core'
],
[
'babel-plugin-import',
{
'libraryName': '#material-ui/icons',
// Use "'libraryDirectory': ''," if your bundler does not support ES modules
'libraryDirectory': 'esm',
'camel2DashComponentName': false
},
'icons'
]
];
module.exports = {plugins};
How can I do that ? It seems that .babelrc works differently to the .babelrc.js
As indicate in https://babeljs.io/docs/en/config-files:
For compatibility reasons, .babelrc is an alias for .babelrc.json.
So your first script is JSON format and the second one is CommonJS.
Mi suggestion is just copy the contents of plugins from your second script inside the "plugins" section of your first one, and use any JSON validation tool to make sure that the result is correct, see [1]
That being said I suggest that you use .babelrc.cjs (CommonJS) format as it is just javascript code can be formated easily using tools like prettier and support some features that JSON does not like comments, see [2]
[1] .babelrc or .babelrc.json
{
"presets": ["#babel/preset-env", "#babel/react"],
"plugins": [
["#babel/plugin-syntax-dynamic-import"],
["react-hot-loader/babel"],
["import", {
"libraryName": "antd",
"style": true
}],
[
"#babel/plugin-transform-runtime",
{
"regenerator": true
}
],
[
"babel-plugin-import",
{
"libraryName": "#material-ui/core",
"libraryDirectory": "esm",
"camel2DashComponentName": false
},
"core"
],
[
"babel-plugin-import",
{
"libraryName": "#material-ui/icons",
"libraryDirectory": "esm",
"camel2DashComponentName": false
},
"icons"
]
]
}
[2] .babelrc.js or .baberc.cjs
{
"presets": ["#babel/preset-env", "#babel/react"],
"plugins": [
["#babel/plugin-syntax-dynamic-import"],
["react-hot-loader/babel"],
["import", {
"libraryName": "antd",
"style": true
}],
[
"#babel/plugin-transform-runtime",
{
"regenerator": true
}
]
]
const presets
const plugins = [
[
'babel-plugin-import',
{
'libraryName': '#material-ui/core',
// Use "'libraryDirectory': ''," if your bundler does not support ES modules
'libraryDirectory': 'esm',
'camel2DashComponentName': false
},
'core'
],
[
'babel-plugin-import',
{
'libraryName': '#material-ui/icons',
// Use "'libraryDirectory': ''," if your bundler does not support ES modules
'libraryDirectory': 'esm',
'camel2DashComponentName': false
},
'icons'
]
];
module.exports = {plugins};
I am trying to optimize my webpack bundle size by splitting it into two bundles: webpack-bundle.js, which contains my code, and vendor-bundle.js, which contains node modules and third party libraries. But after I successfully created two bundles, I am getting two errors in the browser regarding both bundles:
Uncaught ReferenceError: exports is not defined at vendor-bundle.self-879f615019647c756dc959f99d735b3a2534b00805364ae6fca0091d1190d62d.js?body=1:1
Uncaught TypeError: Cannot read property 'call' of undefined at I (webpack-bundle.self-78221fc03008c178fe970b69731594f14d651dab84e5cf928beacc805ebde79c.js?body=1:1)
This is my webpack.config.js.
const config = {
"entry": {
"webpack-bundle": "./app/registration",
},
"output": {
filename: "[name].js",
path: pathLib.resolve(__dirname, "../app/assets/webpack"),
},
"module": {
"rules": [
{
"exclude": /node_modules/,
"test": /\.jsx?$/,
"use": {
"loader": "babel-loader",
"options": {
"plugins": [
"#babel/plugin-proposal-class-properties",
["#babel/plugin-proposal-decorators", {"legacy": true}],
"#babel/plugin-proposal-export-namespace-from",
"#babel/plugin-proposal-function-sent",
"#babel/plugin-proposal-json-strings",
"#babel/plugin-proposal-numeric-separator",
"#babel/plugin-proposal-object-rest-spread",
"#babel/plugin-proposal-throw-expressions",
"#babel/plugin-syntax-dynamic-import",
"#babel/plugin-syntax-import-meta",
"#babel/plugin-transform-react-jsx"
],
"presets": [
"#babel/preset-env",
"#babel/preset-react"
]
}
}
}
],
},
"plugins": [
new webpack.ProvidePlugin({
"$": "jquery",
"jQuery": "jquery",
"window.jQuery": "jquery"
}),
new UglifyJsPlugin(),
],
"optimization": {
"splitChunks": {
"cacheGroups": {
"vendor": {
"test": /node_modules/,
"chunks": "all",
"name": "vendor-bundle"
}
}
}
},
"resolve": {
"alias": {
"Lib": pathLib.resolve(__dirname, "app/lib/"),
"Shared": pathLib.resolve(__dirname, "app/shared/")
},
"extensions": [".js", ".jsx"]
},
"target": "node"
};
module.exports = config;
This is my .babelrc:
{
"plugins": [
"#babel/plugin-proposal-class-properties",
["#babel/plugin-proposal-decorators", {"legacy": true}],
"#babel/plugin-proposal-export-namespace-from",
"#babel/plugin-proposal-function-sent",
"#babel/plugin-proposal-json-strings",
"#babel/plugin-proposal-numeric-separator",
"#babel/plugin-proposal-object-rest-spread",
"#babel/plugin-proposal-throw-expressions",
"#babel/plugin-syntax-dynamic-import",
"#babel/plugin-syntax-import-meta",
"#babel/plugin-transform-react-jsx"
],
"presets": [
"#babel/preset-env",
"#babel/preset-react"
]
}
We use React, Rails, React on Rails, and Slim. To load webpack, I'd add this to my application.slim:
= javascript_include_tag 'vendor-bundle'
= javascript_include_tag 'webpack-bundle'
I want to be able to serve the two bundles I created. Is there anything wrong in the way I configured my webpack and split the bundle? Or should I install something else?
At the bottom of your webpack config, you have your target mode set to node
In node, module and module.exports both exist, but these don’t exist in the browser - this is what’s causing the error
If you remove this line, webpack will assume you’re targeting browsers instead, and will also transform this line for you - your bundles should then run in the browser as expected.
Doing some testing of some NodeJS functions using Jest, but it doesn't like import statements, e.g. import DatabaseController from '../util/database-controller'.
I've doing some reading and people suggested installing babel-jest and updating my config (below), but I've not had any luck. What am I missing? From what I understand, it doesn't understand import statements as it's an es6 thing...
Jest part of my package.json:
"jest": {
"collectCoverageFrom": [
"src/**/*.{js,jsx}"
],
"resolver": "jest-pnp-resolver",
"setupFiles": [
"react-app-polyfill/jsdom"
],
"testMatch": [
"<rootDir>/**/__tests__/**/*.{js,jsx}",
"<rootDir>/**/?(*.)(spec|test).{js,jsx}"
],
"testEnvironment": "jsdom",
"testURL": "http://localhost",
"transform": {
"^.+\\.jsx?$": "babel-jest",
"^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
"^(?!.*\\.(js|jsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
},
"transformIgnorePatterns": [
"[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$",
"^.+\\.module\\.(css|sass|scss)$"
],
"moduleNameMapper": {
"^react-native$": "react-native-web",
"^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
},
"moduleFileExtensions": [
"web.js",
"js",
"json",
"web.jsx",
"jsx",
"node"
]
},
Lately I find that I don't need babel-jest at all, and can get by simply with #babel/preset-env, and the following .babelrc:
{
"env": {
"test": {
"presets": [["#babel/preset-env"]]
}
}
}
This worked for my simple set-up:
devDependencies (in package.json):
"devDependencies": {
"babel-eslint": "^10.0.3",
"babel-preset-env": "^1.7.0",
"jest": "^24.9.0",
"parcel-bundler": "^1.12.3"
}
I simply created a babel.config.js as follows:
// babel.config.js
module.exports = {
presets: [
[
'#babel/preset-env',
{
targets: {
node: 'current',
},
},
],
],
};
Note - make sure to clear the cache before running!
Clear cache:
./node_modules/.bin/jest --clearCache
I introduced code coverage in my project, but all the values (except one) are stuck at zero.
Here is my jest-config.json:
{
"collectCoverageFrom": [
"../shared/utils/*.js"
],
"coverageDirectory": "<rootDir>/coverage",
"coverageThreshold": {
"global": {
"branches": 0,
"functions": 0,
"lines": 0,
"statements": 0
}
},
"moduleFileExtensions": [
"js"
],
"moduleNameMapper": {
"\\.(css|scss)$": "identity-obj-proxy"
},
"moduleDirectories": [
"node_modules",
"job-board/node_modules"
],
"modulePaths": [
"<rootDir>/client"
],
"roots": [
"<rootDir>",
"<rootDir>/../shared"
],
"testRegex": "\\.test\\.js$"
}
My files being tested are in ../shared/src/utils/*.js and my tests are in ../shared/src/utils/__tests__/*.test.js.
And when I run node --harmony_proxies node_modules/jest-cli/bin/jest.js --config ./jest-config.json --coverage, I get this result:
Only, nearly all the functions in those files are fully tested...
Has anyone come across this problem?
Thanks in advance.
Run jest --coverage command to check coverage